ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (473)
  • Solanum tuberosum L.  (269)
  • potato  (213)
  • Animals
  • Chemical Engineering
  • Rat
  • Springer  (473)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (473)
Collection
  • Articles  (473)
Source
Keywords
Publisher
Years
Topic
  • 1
    Electronic Resource
    Electronic Resource
    A novel method for investigating the uptake and distribution of radiolabelled imazethapyr in potato tubers (2000)
    Springer
    Potato research 43 (2000), S. 203-209 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; Storite Clear ; Storite Flowable ; radionuclide ; scintillation counting ; sprout suppression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The use of imazethapyr as a sprout suppressant in potatoes has been investigated. Novel radionuclide techniques were developed to establish the patterns of uptake and movement of imazethapyr in potatoes. Protocols for tissue analysis were established to homogenise potato tuber tissue samples, enabling radiolabel recovery by liquid scintillation counting to approach 100%. The movement of imazethapyr was also examined in the presence of an acidic formulation of thiabendazole which caused increased uptake. The movement of imazethapyr within the tuber was also influenced by pH and ion trapping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358080
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Expression and activity of antioxidant enzymes during potato tuber dormancy (2000)
    Springer
    Potato research 43 (2000), S. 383-393 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; plant development ; antioxidant genes ; gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The expression of antioxidant genes has been analyzed in a potato plant and during tuber dormancy. Manganese superoxide dismutase (MnSOD), cytosolic copper and zinc superoide dismutase (Cu/ZnSOD), catalase class II, cytosolic ascorbate peroxidase (APX) and glutathione peroxidase (GPX) are expressed at the RNA level in all the contexts analyzed. By contrast, the expression of the iron superoxide dismutase (FeSOD) and plastidic Cu/ZnSOD seems to be limited to green tissues, as shown by northern blots and native gels. A complex DAB-peroxidase isozyme pattern (using diaminobenzidine as substrate) has been observed in different developmental contexts analyzed, but hardly observed in tubers. During tuber dormancy, MnSOD and cytosolic Cu/ZnSOD activity was relatively constant in both Désirée and Bintje varieties while catalase activity decreases. Moreover, tuber dormancy breakage did not involve significant changes in the activity of these enzymes. On the basis of these results, the possible link between active oxygen species (AOS) metabolism and dormancy is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360542
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Accumulation of mineral elements in tuber periderm of potato cultivars differing in susceptibility to common scab (2000)
    Springer
    Potato research 43 (2000), S. 107-114 
    Details
    ISSN: 1871-4528
    Keywords: actinomycetes ; resistance ; scab incidence ; Solanum tuberosum L. ; Streptomyces scabies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Concentrations of Ca, P, K, Mg, Al, Fe, Mn, Cu and Zn were determined in healthy tuber peelings of cultivars less (Karin, Santé and Symfonia) and more (Agria, Désirée and Tomensa) susceptible to common scab when grown at two sites that differed in the level of scab incidence. The accumulation of some elements was significantly influenced by site, year, cultivar, maturity and the age of tuber periderm. At both sites, Ca and P in periderm tissue declined but Mg increased during the growing season. The Ca/P ratios in tuber periderm of all cultivars greatly decreased 83 days after planting. Concentrations of mineral elements measured at harvest may not reflect conditions present during the infection period, and consequently may not be related to scab incidence or severity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357951
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Erwinia resistance in backcross progenies ofSolanum tuberosum x S. tarijense andS. tuberosum (+) S. commersonii hybrids (2000)
    Springer
    Potato research 43 (2000), S. 135-142 
    Details
    ISSN: 1871-4528
    Keywords: tuber soft rot ; 2n gametes ; sexual hybridization ; somatic hybridization ; germplasm exploitation ; potato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The resistance to tuber soft rot caused byErwinia carotovora ofSolanum tuberosum x S. tarijense andS. tuberosum (+) S. commersonii hybrids and their backcrosses is reported. A number of resistant diploid sexual hybrids and tetraploid/hexaploid somatic hybrids were selected. Backcross progenies were obtained through 2x×4x crosses involving a resistant diploid hybrid and tetraploidS. tuberosum, and through 4x×4x crosses between a resistant somatic hybrid andS. tuberosum. The hybrids showed high variability interms of resistance to tuber soft rot. The resistance of progeny from 2x×4x backcrosses was similar to that of the parental sexual hybrid. By contrast, the resistance of genotypes deriving from 4x×4x backcrosses was reduced compared with the resistant somatic hybrid. In general, tuber characteristics of the backcross hybrids improved considerably as compared with their parents, and tuber yield per plant was good.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357954
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Development of amylose-free (amf) monoploid potatoes as new basic material for mutation breeding in vitro (2000)
    Springer
    Potato research 43 (2000), S. 179-189 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; prickle pollination ; ploidy level ; flow-cytometry ; adventitious shoots ; in vitro tuber induction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary For the induction and selection of double mutants with altered starch composition, a uniform (homohistont) amylose-free (amf) monoploid as basic plant is of vital importance. Therefore, newamf monoploids had to be developed via prickle pollination. And 26 monoploids were obtained which were screened in vitro for vigour, leaf size and for the percentage of monoploid cells. The number of monoploid cells was underestimated at about 28%. Seven vigorous monoploids were tested in vitro for tuberization capacity, which varied from 0 to 100%. After regeneration in vitro, 0 to 3.7 adventitious shoots per leaf explant were formed. The tuberization capacity of these shoots varied from 0 to 48. Twoamf monoploids were selected which were vigorous and tuberized well in vitro. They are the basis for the application of an in vitro mutation breeding protocol that should lead to the induction and selection of new starch mutants in potato.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357958
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Slug damage and control of field slug (Deroceras reticulatum (Müller)) by carvone in stored potatoes (2000)
    Springer
    Potato research 43 (2000), S. 253-261 
    Details
    ISSN: 1871-4528
    Keywords: laboratory tests ; storage ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary After a wet autumn and harvesting under wet conditions, slugs brought into potato stores via clods and soil adhering to tubers may cause substantial damage by feeding on the tubers. A carvone sprout inhibitor, Talent®, applied in the potato stores at a dose of 50 ml per tonne potatoes, controlled slugs within a few days. A dose of 25 ml carvone was insufficient. Using a laboratory box test, the slug (Deroceras reticulatum) affected only wounded tubers and, although slime was present on the unwounded potatoes, they were not damaged by slugs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358084
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Reduction of potato damage during grading by radiant heating (2000)
    Springer
    Potato research 43 (2000), S. 273-278 
    Details
    ISSN: 1871-4528
    Keywords: cold storage ; store management ; potato handling ; tuber temperature ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of using radiant heat to quickly warm potatoes and reduce damage in handling after cold storage was investigated. Two treatments were investigated: tubers dropped 350 mm with no radiant heat applied, and tubers dropped with radiant heat applied. Both treatments were compared with a control set of tubers which were taken directly out of store. The mean damage index per tuber was significantly reduced following radiant heat treatment although there were cultivar and size variations. The temperature profile under radiant heat was also measured which showed an increase in the outside flesh temperature of 8–12°C depending on tuber colour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358086
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Expression of the chemically inducible maize GST-27 promoter in potato (2000)
    Springer
    Potato research 43 (2000), S. 335-345 
    Details
    ISSN: 1871-4528
    Keywords: chemical inducible gene expression ; glutathione S-transferase ; Solanum tuberosum L. ; herbicide safener ; tuber
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Chemically inducible gene regulation systems provide a mechanism for a temporal control of expression of transgenes. In this study expression from the herbicide safener inducible maize GST-27 promoter was tested in potato, with the aim of using this to provide inducible expression of transgenes implicated in dormancy control. A binary vector comprising 3.8 kb of the GST-27 promoter was fused to the β-glucuronidase (GUS) reporter gene and transformed into potato. Application of the chemical inducer elevated the expression of GUS up to 40 fold in leaf tissue. However in stems, roots and tubers the GST-27 promoter caused high levels of expression of GUS in the absence of safener, demonstrating that in these tissues it acts as a constitutive promoter. A deleted promoter region of the GST-27 promoter displayed a similar expression pattern. Analysis of GUS activity in dormant and sprouting tubers showed that the GST-27 promoter was a strong constitutive promoter throughout the tuber life cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360539
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Long-day-adaptedSolanum phureja as a source of resistance to blackleg caused byErwinia carotovora subsp.atroseptica (2000)
    Springer
    Potato research 43 (2000), S. 279-285 
    Details
    ISSN: 1871-4528
    Keywords: potato ; wild species ; disease ; bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Long-day-adaptedSolanum phureja clones were assessed for resistance to blackleg caused byErwinia carotovora subsp.atroseptica under field and controlled environmental conditions over two years. In the field, twenty-two of the twenty-three clones ofS. phureja assessed were as resistant to blackleg as the commercial cultivar Ailsa, the most resistant control, and were significantly (P〈0.001) more resistant than the intermediate and susceptible cultivars Wilja and Estima, respectively. Under controlled environmental conditions, resistance in commercial cultivars was more easily overcome. However, 18 of the 21S. phureja clones assessed were significantly more resistant to blackleg than these cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358087
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Subcutaneous tissue discoloration in ware potatoes. 2. Impact measured by an instrumented sphere (2000)
    Springer
    Potato research 43 (2000), S. 225-238 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; damage ; bruising ; blackspot ; handling ; velocity change
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Potatoes are exposed to mechanical forces which can lead to subcutaneous tissue discoloration resulting in losses. We investigated the number and intensity of impacts in different phases of representative Dutch ware potato handling chains using an instrumented sphere (IS). Other questions we asked were, to which drop height onto a defined surface do measured impacts correspond, and what is the relation between the number of impacts and damage? Close relationships between peak acceleration and velocity change for different drop heights were found for various cushioning materials, thus allowing interpretation of impact measurements in terms of drops. The IS recorded c. 340 impacts exceeding 30g. The contribution to the total number of impacts was 11% for Harvest, 0% for Storage, 10% for Transport and 79% for Packaging. The number and intensity of impacts correlated well with the amount of subcutaneous tissue discoloration. It is concluded that the produce-friendliness of the handling chains can be improved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358082
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 11
    Electronic Resource
    Electronic Resource
    The effect of boron on calcium uptake and growth in micropropagated potato plantlets (2000)
    Springer
    Potato research 43 (2000), S. 287-295 
    Details
    ISSN: 1871-4528
    Keywords: nutrient analysis ; culture media ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Boron (B) requirements differ widely among plant species and the concentration range between toxicity and deficiency is less for B than for any other nutrient. Excess B can adversely affect calcium (Ca) uptake and plant growth. Potato cvs Bintje and Norland plantlets were micropropagated on Murashige & Skoog (MS) nutrient medium, supplemented with 3 (MS control level) or 9 mM Ca, and a range of H3BO3 levels (0.025 to 0.300 mM B). Medium B levels of 0.100 and 0.300 mM decreased Ca content in leaves and shoots of cv. Norland, but not Bintje. Medium B level of 0.025 mM, which is 25% of the control MS level, enhanced Ca uptake in cv. Norland and did not compromise normal plantlet growth in either cultivar. This lower H3BO3 level (0.025 mM B), and a B-free gelling agent such as Gelrite, could be used for micropropagation of potato and possibly other species susceptible to Ca defifiency disorders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358088
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    A SWACROP-based potato root water-uptake function as determined under tropical conditions (2000)
    Springer
    Potato research 43 (2000), S. 19-29 
    Details
    ISSN: 1871-4528
    Keywords: root-water uptake ; modeling ; SWACROP ; Ferralsols ; tropics ; Cuba ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The SWACROP root-water uptake function for potatoes was determined in the 1994–95 crop season on a Ferralsol in Havana province, west Cuba. The maximum pressure-heads under which water is optimally extracted by potato roots were very similar to the original Feddes function. Nevertheless, the anaerobiosis point and the wilting point pressure-head in both functions were not in agreement. However, the simulated values of soil water contents in the 0–40 cm soil depth by performing SWACROP runs in the 1995–96 potato crop season using both functions were very similar. The original Feddes function seems to be good enough for predicting soil water contents in the tropics and no specific other functions need to be developed for any particular soil or climate condition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358510
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Nutritional value of potato tubers from field grown plants treated with deltamethrin (2000)
    Springer
    Potato research 43 (2000), S. 43-48 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; Decis® ; Colorado potato beetle ; tuber quality ; dry matter content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Tubers showed changes in their nutritional value caused by the treatment of the plants with the insecticide deltamethrin. The level of starch was increased in comparison with control tubers; but the amylose percentage was not affected. In contrast, the total protein content decreased in tubers from treated plants, whereas free amino acids level and ascorbic acid content increased. The results showed that the changes in the tubers caused by the treatment of potato plants with deltamethrin did not adversely affect the nutritional value of the progeny tubers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358512
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Assessment of new potato cultivars in Europe: a survey (2000)
    Springer
    Potato research 43 (2000), S. 97-106 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; National List ; Recommended Trials ; growing crop ; tuber ; yield ; quality ; disease ; nematodes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In 1994, a postal questionnaire was sent to 41 institutes in 27 countries to obtain information on the national potato cultivar testing programmes in Europe. Responses were received from 19 countries. Foliage, tuber and yield characteristics were assessed in all countries but the number of sites and replicated varied considerably between the countries. Cooking and taste qualities were measured in most countries using relatively simple methods but processing characteristics were tested less commonly. Susceptibility to the most common diseases, i.e. late blight, common scab, leafroll and PVYo, was assessed in over 75% of the countries while resistance to another 21 disease and 4 potato cyst nematode pathotypes was assessed by various countries, depending on their national importance. Many of the assessments were based on records of natural infection although controlled inoculation tests were done more frequently for the more important diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357950
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Fertilizer management impacts on stand establishment, disease, and yield of Irish potato (2000)
    Springer
    Potato research 43 (2000), S. 49-59 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; soil fertility ; soluble salts ; plant spacing ; Rhizoctonia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Excessive fertilizer application in North Carolina, USA results in high residual soil levels of P, K and total soluble salts in potato fields. Our objectives were to determine the salt sensitivity of three common cultivars (Atlantic. Snowden and Superior), and the effects of planting density and fertilization on stand establishment, soilborne disease, and yield. Greenhouse results suggest that potato growth and emergence, but not shoot initation, are reduced by high salinity. On a Portsmouth fine sandy loam, high fertilizer rates did not reduce stands of cv. Atlantic in the field in 1996 or 1997. Excess N resulted in moreRhizoctonia stem canker in 1996, and lower yields at the lower planting density in 1997. Yield compensation for reduced plant density occurred in 1997 at the lower N rates (56 and 112 kg N ha−1) and at the high PK rate (49 kg P and 139 kg K ha−1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358513
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    Interaction between jasmonic and gibberellic acids on in vitro tuberization of potato plantlets (2000)
    Springer
    Potato research 43 (2000), S. 83-88 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; potato tuberization ; growth regulators
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A reverse of the delaying effect of gibberellic acid (GA3) was observed in in vitro tuberization of potato plantlets when the medium contained 0.8×10−5 M jasmonic acid (JA). The promoting effect of JA seemed to be correlated with the initial absence of growing roots, probably through direct activity of JA in microtuber-producing buds in the stoloniferous shoots. This is based on the fact that JA did not inhibit root growth a posteriori. Endogenous gibberellins (GAs) synthesized by roots did not interfere with the previous activity of JA in tuberization. The absence of a JA promoting-effect on tuberization of previously-rooted plantlets could be related to the capacity of potato roots to synthesize endogenous GAs which might antagonize the JA effect on buds of stoloniferous shoots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358516
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    Bacillus thuringiensis cry1Ab gene confers resistance to potato againstHelicoverpa armigera (Hubner) (2000)
    Springer
    Potato research 43 (2000), S. 143-152 
    Details
    ISSN: 1871-4528
    Keywords: transgenic plants ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Helicoverpa armigera is one of the important insect pests adversely affecting the yield of potatoes in India. A synthetic gene encoding the insecticidal crystal protein (Cry1Ab) ofBacillus thuringiensis (Bt) has been introduced into five genotypes of potato usingAgrobacterium tumefaciens. Southern analysis of DNA from transgenic plants confirmed the integration and copy number of the transgene. Double-antibody quantitative sandwich ELISA analysis demonstrated high levels of Cry1Ab protein expression in transgenic plants. Insect bioassays on the leaves of transgenic plants showed considerable protection against the larvae ofH. armigera in terms of leaf area consumed and larval weight reduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357955
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Subcutaneous tissue discoloration in ware potatoes. 1. A chain analysis in the Netherlands (2000)
    Springer
    Potato research 43 (2000), S. 211-224 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; damage ; bruising ; impact ; blackspot ; handling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In the chain of handling operations from harvesting to packaging inclusive, potatoes are exposed to many brief mechanical forces (impacts) and to long-term pressure. Impact and pressure can lead to subcutaneous tissue discoloration causing qualitative and quantitative losses. We investigated the characteristics of construction and utilization of representative Dutch ware potato handling chains and found that the number and height of drops appeared to be too high, the use of cushioning materials insufficient and the speed of the transporting parts too high and not in balance with each other. The contribution to the total amount of subcutaneous tissue discoloration was 16% for the harvesting to bin filling phases inclusive, 22% for the storage phase, 27% for the shovelling to truck loading phases inclusive and 35% for the truck unloading to packaging phases inclusive. These contributions varied considerably within phases and within links. The results can be used to develop equipment, upgrade present chains and design new, produce-frendly handling chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358081
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    Testing the resistance to silver scurf in commercial potato cultivars under controlled environmental conditions (2000)
    Springer
    Potato research 43 (2000), S. 263-271 
    Details
    ISSN: 1871-4528
    Keywords: Helminthosporium solani ; storage conditions ; disease resistance ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Optimum storage conditions to identify resistance to silver scurf among commercially grown potato cultivars were determined in a series of experiments. Inoculation of field-grown tubers with a conidial suspension ofH. solani (concentration 104 conidia per ml of water) and incubation at 15°C with 95% RH for 1 month followed by 2 months at 85% RH produced the greatest differences in disease severity between potato cultivars. Results with glasshouse-grown tubers were comparable with those from field-grown tubers, indicating that the test could be used to identify resistance in wild species of potato and to understand the inheritance of this resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358085
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Response of tubers of five potato cultivars to co-inoculation with US-1 and US-8 genotypes ofPhytophthora infestans (2000)
    Springer
    Potato research 43 (2000), S. 153-161 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; sexual reproduction ; oospores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The severity of late blight tuber rot in five potato cultivars (Green Mountain, Sebago, Dorita, AC Brador and Island Sunshine) resulting from inoculation with US-1/US-8 combinations of Canadian isolates ofPhytophthora infestans was evaluated. In addition, the potential for mixed (A1∶A2) inoculations to result in oospore formation was examined. In studies conducted in 1996 and 1997, cv. Dorita (and Island Sunshine in 1997) developed the least amount of surface or internal necrosis relative to the other cultivars following co-inoculation with US-1 and US-8 isolates ofP. infestans. Differences also were revealed among isolate combinations used for inoculation. The combination of a US-1 isolate from Prince Edward Island with a US-8 isolate from New Brunswick consistently produced the least amount of necrosis in tubers of the various cultivars. There was no evidence of oospore production in any of the tubers examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357956
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 21
    Electronic Resource
    Electronic Resource
    Genetic mapping from field tests of qualitative and quantitative resistance to Phytophthora infestans in a population derived from Solanum tuberosum and Solanum berthaultii (2000)
    Springer
    Molecular breeding 6 (2000), S. 25-36 
    Details
    ISSN: 1572-9788
    Keywords: late blight ; Phytophthora infestans ; potato ; resistance,Solanum berthaultii ; Solanum tuberosum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Under controlled field conditions, a Solanum backcross population segregated for resistance to Phytophthora infestans. The population (`BCT') had been derived previously by crossing the Solanum tuberosum dihaploid USW2230 × Solanum berthaultii PI473331 to obtain the hybrid M200-30, and then backcrossing the hybrid to the S. tuberosum dihaploid HH1-9. Resistance was assessed from analyses of epidemics in small plots of each individual genotype, and data were recorded as area under the disease progress curve (AUDPC). The parents of the original cross (USW2230 and a selection from PI473331) were not included in the test, but the hybrid was incompatible and HH1-9 was compatible with the tester strain of P. infestans (US-8 lineage). Somewhat more than half of the progeny also were incompatible with the tester strain, indicating the presence of an R gene. This gene segregated from the S. berthaultii parent and mapped 4.8 cm from the RFLP marker TG63 on chromosome 10. We deduce that the R gene is not R-1, R-2, R-3, R-6, or R-7 and is probably not R-4, R-5, or R-10. Among the remaining, compatible progeny, there was a wide range of quantitative resistance. All were more resistant than the susceptible cultivar Superior, and most individuals were much more resistant than the moderately resistant cultivar Kennebec. AUDPC values among the sub-population of compatible genotypes ranged from about 400 to 1500 units the first year and from 400 to 1760 units the second year. At least five quantitative trait loci (QTLs) were detected in this sub-population in both 1997 and 1998, including one detected through segregation of alleles from both the hybrid parent and the recurrent S. tuberosum parent. A model of main and epistatic effects explained 56% and 66% of the variation observed for quantitative resistance to late blight in 1997 and 1998, respectively. Several of the QTLs for late blight resistance were located in regions of the genome to which QTLs for late maturity have previously been mapped.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009648408198
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 22
    Electronic Resource
    Electronic Resource
    Improved plant-based production of E1 endoglucanase using potato: expression optimization and tissue targeting (2000)
    Springer
    Molecular breeding 6 (2000), S. 277-285 
    Details
    ISSN: 1572-9788
    Keywords: Acidothermus cellulolyticus ; cellulase ; dual-crop production ; E1 endoglucanase ; expression optimization ; potato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Optimization of Acidothermus cellulolyticus endoglucanase (E1) gene expression in transgenic potato (Solanum tuberosum L.) was examined in this study, where the E1 coding sequence was transcribed under control of a leaf specific promoter (tomato RbcS-3C) or the Mac promoter (a hybrid promoter of mannopine synthase promoter and cauliflower mosaic virus 35S promoter enhancer region). Average E1 activity in leaf extracts of potato transformants, in which E1 protein was targeted by a chloroplast signal peptide and an apoplast signal peptide were much higher than those by an E1 native signal peptide and a vacuole signal peptide. E1 protein accumulated up to 2.6% of total leaf soluble protein, where E1 gene was under control of the RbcS-3C promoter, alfalfa mosaic virus 5′-untranslated leader, and RbcS-2A signal peptide. E1 protein production, based on average E1 activity and E1 protein accumulation in leaf extracts, is higher in potato than those measured previously in transgenic tobacco bearing the same transgene constructs. Comparisons of E1 activity, protein accumulation, and relative mRNA levels showed that E1 expression under control of tomato RbcS-3C promoter was specifically localized in leaf tissues, while E1 gene was expressed in both leaf and tuber tissues under control of Mac promoter. This suggests dual-crop applications in which potato vines serve as enzyme production `bioreactors' while tubers are preserved for culinary applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009653011948
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 23
    Electronic Resource
    Electronic Resource
    Induction of novel organelle DNA variation and transfer of resistance to frost and Verticillium wilt in Solanum tuberosum through somatic hybridization with 1EBN S. commersonii (2000)
    Springer
    Euphytica 116 (2000), S. 1-10 
    Details
    ISSN: 1573-5060
    Keywords: chloroplasts ; mitochondria ; potato ; Solanum commersonii ; somatic hybrids ; stress resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Somatic hybridization can be used to induce genetic variability in plastidial and mitochondrial genomes, and transfer multiple uncloned genes across sexual barriers. Somatic hybrids were produced between a dihaploid clone of the common potato, S. tuberosum subsp. tuberosum, and the wild sexually incongruent diploid species S. commersonii. Fusion products were selected on the basis of callus growth and regeneration in vitro. Genome composition of putative somatic hybrids was determined by flow cytometric analysis of nuclear DNA content, RAPD analysis, and Southern analysis with probes specific to organellar DNA. All regenerated fusion products proved to be hybrids based on RAPD analysis. Seventy per cent of somatic hybrids were (near) tetraploids, 22% (near) hexaploids and 8%(near) octoploids. A high correlation was found between the nuclear DNA content determined by flow cytometry and the number of chloroplasts in stomata guard cell pairs. Somatic hybrids inherited the parental plastids in a random manner. On the contrary, they preferentially inherited the mitochondrial DNA fragments of S. tuberosum. The majority of them had a rearranged mitochondrial genome with fragments from both parents. Hybrids were highly vigorous and morphologically more similar to the cultivated than to the wild parent, produced tubers on long stolons under long photoperiod conditions, showed a high degree of flowering, but did not produce pollen. In addition, somatic hybrids were generally more resistant to frost and Verticillium wilt than the cultivated parent, indicating the introgression of relevant resistance genes from the wild species into the genetic background of S. tuberosum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003943704037
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 24
    Electronic Resource
    Electronic Resource
    Chloroplast DNA variation in the wild potato species, Solanum acaule and S. albicans (2000)
    Springer
    Euphytica 116 (2000), S. 197-202 
    Details
    ISSN: 1573-5060
    Keywords: chloroplast DNA ; intraspecific variation ; potato ; Solanum acaule
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The chloroplast DNA of Solanum acaule (109 accessions) and S. albicans (9 accessions) was investigated by restriction endonuclease analysis. Unexpectedly, all the accessions analyzed had C type chloroplast DNA in common. This suggested that S. acaule originated from a species with C type chloroplast DNA. DraI restriction digestion revealed further differentiation of C type chloroplast DNA into 8 types. The DraI polymorphism indicated the province of Salta in Argentina and the nearby regions to be a center of diversity for S. acaule. Surprisingly, S. albicans as well as S. acaule both ssp. acaule and ssp. punae, from Peru were virtually indistinguishable, although by morphology and/or cytology all three taxa are easily distinguished.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004085805592
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 25
    Electronic Resource
    Electronic Resource
    Molecular markers for cytoplasm in potato: male sterility and contribution of different plastid-mitochondrial configurations to starch production (2000)
    Springer
    Euphytica 116 (2000), S. 221-230 
    Details
    ISSN: 1573-5060
    Keywords: cytoplasm ; male sterility ; plastid ; potato ; somatic hybrids ; starch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Distinct parental cytoplasms were combined in symmetric tetraploid hybrids of potato by somatic cell fusion. This allowed, in the presence of nearly isogenic nuclear genomes, to estimate the contribution of mitochondrial (mt) and chloroplast (cp) genomes to starch content. Analysis of mt-cp configurations in the complete gene pool of german potato cultivars [2n=4x], in a reciprocal dihaploid population [2n=2x],in di-haploid fusion parents [2n=2x] and in their respective hybrids [2n=4x] made visible the effects of different cytoplasmic backgrounds and mitochondrial subgenomic rearrangements. Genotypes identified by markers as cytoplasm Wγ were associated with cytoplasmic male sterility. Evaluation of cytoplasmic types leads to the conclusion, that in starch content the ‘wild type’ cytoplasms Wα and Wγ have a significant advantage to other cytoplasmic types(Tβ, Wδ, Sε).This results from the experiments with a reciprocal population, 180 di-haploids, and from cultivar comparisons. In hybrids an interaction between starch content and different mt-cp combinations could be found. In general the highest field performance, measured in starch content and yield was associated with such cytoplasmic configurations which appeared to a high frequency within a population, when the segregation process was completed. This fact is explained by a selection advantage of clones with optimized organellar segregation already during in vitro phase. PCR markers for cytoplasm differentiation are actualized on a website, http://www.flg.tum.de/pbpz/mm/mt/hybrid.html
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004039320227
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 26
    Electronic Resource
    Electronic Resource
    Induction of mutations for heat tolerance in potato by using in vitro culture and radiation (2000)
    Springer
    Euphytica 114 (2000), S. 205-209 
    Details
    ISSN: 1573-5060
    Keywords: in vitro ; culture ; gamma rays ; heat tolerance ; potato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Heat tolerant mutants were obtained in two commercial potato cultivars, `Kufri Jyoti' and `Kufri Chandramukhi' through in vitro mutagenesis of in vitro propagated plantlets. Gamma-irradiated (20 and 40 Gy) shoots were micropropagated for three cycles (M1V3). A large number of the micropropagated shoots produced microtubers at 28 °C. Microtubers induced at high temperature had distorted shape but showed normal germination in field. Under stress conditions of high temperature, the frequency of chlorophyll variants increased in the gamma irradiation-derived material, however, nearly 40% of the plants had normal leaf tissue, whereas control plants showed completely damaged leaves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003965724880
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 27
    Electronic Resource
    Electronic Resource
    Effect of indole-3-acetic acid and kinetin on tuberisation parameters of different cultivars and transgenic lines of potato in vitro (2000)
    Springer
    Plant growth regulation 32 (2000), S. 245-251 
    Details
    ISSN: 1573-5087
    Keywords: auxin ; cytokinin ; kinetin ; sucrose ; potato ; tuberisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of indole-3-acetic acid or kinetin on the weight and numberof microtubers formed was studied on single node cuttings of sevendifferent potato (Solanum tuberosum L.) cultivars as well astransgenic lines harbouring rolB or rolC genes undercontrol of the patatin class I (B33) promoter. Plants were cultivatedin vitro in the dark on solidified MS medium containing 1 to8% sucrose with or without phytohormones. Most of thenontransformed potato cultivars and transgenic lines responded tohormone application by an increase in tuber yield. Auxin and cytokininacted differently: IAA increased predominantly the tuber size whilekinetin increased the number of tubers. RolC transformantsdisplayed an altered response to sucrose and especially to auxin. Thedegree of phytohormone effect on tuberisation parameters depended onsucrose content of the medium and potato genotype.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010771510526
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 28
    Electronic Resource
    Electronic Resource
    RAPD markers efficiently distinguish heterogenous populations of wild potato (Solanum) (2000)
    Springer
    Genetic resources and crop evolution 47 (2000), S. 115-121 
    Details
    ISSN: 1573-5109
    Keywords: diversity ; genebank ; germplasm ; potato ; RAPD ; Solanum sucrense
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Genetic characterization of germplasm is important for setting objective guidelines for conservation. One common problem found in genebanks is determining the value of populations with insufficient or unreliable data regarding their geographic origin. In this study, a genetic analysis based on RAPD markers was conducted to characterize a `mystery' population of Solanum sucrense, a polysomic tetraploid potato (2n=4x=48), for which adequate documentation was lacking. The comparative analysis of genetic similarities between this mystery population and each one of 30 other S. sucrense populations in the genebank revealed that all populations within this species, including the mystery population, are significantly different from being duplicates, and are therefore worthy of separate conservation. RAPD markers also distinguished the mystery population from closely related tetraploid species S. oplocense, S. gourlayi and S. tuberosum ssp. andigena, suggesting that it is also not a duplicate of a population of these species. If RAPDs can clearly differentiate populations within highly heterogeneous tetraploids like S. sucrense, they should be generally useful for determining germplasm organization within potato species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008725121904
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 29
    Electronic Resource
    Electronic Resource
    Yield response and nitrogen utilization efficiency by drip-irrigated potato (1999)
    Springer
    Nutrient cycling in agroecosystems 54 (1999), S. 243-249 
    Details
    ISSN: 1573-0867
    Keywords: Fertigation ; trickle-irrigation ; N utilization efficiency ; calcareous soil ; potato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two field experiments were conducted in the Jordan Valley to evaluate potato response to N fertigation. Nitrogen as ammonium sulphate was supplied through irrigation water (fertigation) at rates of 0, 35, 70 and 105 mg N l-1. Soil N application treatment equivalent to the fertigation treatment of 70 mg N l-1 was included. 15N labelled ammonium sulphate was used to evaluate the N recovery and utilization efficiency. Yield increased by the N rate. The soil N application gave higher yield than the zero N and lower than the fertigated treatments. The increase in yield was due to the increase in the size of the tubers. The specific gravity was the highest with the zero N. The index ratios of potato tubers were similar with all treatments. The N derived from fertilizers by both tubers and shoots, increased with the N rate regardless of the method of application. The soil application treatments had fertilizer utilization as high as the fertigation treatments and produced total tuber yield not significantly different from that obtained by the fertigation treatment with similar rate. This might be attributed to the poor fertilizer distribution in the root zone in the fine textured soil. The low value of the fertilizer utilization of the plant receiving the 15N in the preceding season suggested possibilities of rapid transformation and immobilization by the soil microorganisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009855426670
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 30
    Electronic Resource
    Electronic Resource
    Der Einflu\ variierter Düngung, einer Pflanzenschutzmittel-Anwendung und der Lagerung auf den Glykoalkaloid-Gehalt in Kartoffelknollen zweier Sorten (1999)
    Springer
    Potato research 42 (1999), S. 79-88 
    Details
    ISSN: 1871-4528
    Keywords: Solanin ; Chaconin ; Magnesium ; Kalium ; Stickstoff ; Solanum tuberosum L. ; Phytophthora infestans ; Feldversuch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary Field experiments were carried out for three years to study the effect of various magnesium, potassium and nitrogen fertilization rates on two medium-early edible potato cultivars. Additionally, one of the experimental areas was sprayed againstPhytophthora infestans to ascertain the effect of fungicides on the content of total glycoalkaloids (TGA) in potato tubers after harvest and after six months of storage. The applied fungicide treatments increased total glycoalkaloids (TGA) of potato tubers (Fig. 4). Fertilization with mineral nitrogen caused different reactions in both cultivars. There was a tendency for cv. Beryl to accumulate more glycoalkaloids with increasing nitrogen fertilization rates, while the opposite was observed for cv. Mila (Fig. 7). Fertilization with potassium and magnesium did not affect the results. On the basis of these results there was no conclusive evidence that the TGA content in the tubers was dependent on cultivar or on the weather during the growing season (Figs 1,2 and 3). The TGA content increased during storage, independently of previous treatments, (Figs 4–7).
    Notes: Zusammenfassung Es wurden Feldversuche in drei Jahren mit zwei Speisekartoffelsorten, verschiedenen Mengen an Mineraldüngern und der Anwendungen eines Pflanzenschutzmittelns gegenPhytophthora infestans angelegt. Die Knollen wurden direkt nach der Ernte sowie nach einer sechsmonatigen Lagerung auf Glykoalkaloidgehalt untersucht. Zwischen den Sorten treten statistisch gesicherte Unterschiede im Gehalt an Glykoalkaloiden auf. Die Anwendung von Pflanzenschutzmitteln während der Vegetation erhöht den Gesamtgehalt an Glykoalkaloiden (TGA) in den Kartoffelknollen kurz nach der Ernte. Eine variierte Mineraldüngung hat keinen statistisch signifikanten Einfluss auf den TGA-Gehalt in den Proben kurz nach der Ernte, N- und K-Düngung verändern diesen jedoch im Laufe der Lagerung. Unabhängig von den übrigen Bedingungen erhöht sich der TGA-Gehalt in diesem Versuch während der Lagerung im Mittel von 5,8 auf 7,7 mg/100g Frischsubstanz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358393
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 31
    Electronic Resource
    Electronic Resource
    The conservation of potato cultivars (1999)
    Springer
    Potato research 42 (1999), S. 427-436 
    Details
    ISSN: 1871-4528
    Keywords: germplasm ; potato ; in vitro ; microtuber ; cryo-conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary To prevent the loss of important genetic information cultivars are conserved in several collections of gene banks. In principal, there are two options for the medium to long-term storage of potato cultivars: storage as in vitro plantlets or microtubers and storage of meristems or shoot-tips in liquid nitrogen. In the Braunschweig potato cultivar collection, 360 cultivars are maintained under slow-growth conditions. Ten microplantlets of each cultivar are stored in test tubes containing filter paper bridges and 5 ml Murashige and Skoog (MS) liquid medium. The cultures were maintained at 10°C with a light intensity of 2 klux and 16 hours-day and can be stored under these conditions up to three years. Two hundred and forty-five cultivars are cryostored in liquid nitrogen. About 300 trimmed shoot-tips of each cultivar are incubated in MS-Towill-medium and then transferred into the cryoprotective solution. After an incubation time of about 2 hours trimmed shoot-tips fixed on an aluminium foil were put in cryo vials and stored in a container. The survival rate of the thawed, trimmed shoot-tips varies from 55%–100%. More important for a gene bank, however, is the plant regeneration. The average regeneration of all cultivars is about 40%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358159
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 32
    Electronic Resource
    Electronic Resource
    In vitro tuberisation of potato: the interaction of ancymidol and photoperiod (1999)
    Springer
    Potato research 42 (1999), S. 601-606 
    Details
    ISSN: 1871-4528
    Keywords: growth regulator ; sucrose ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Ancymidol-induced in vitro tuberisation under different photoperiodic regimes (dark, SD=8 h, LD=16 h) and sucrose concentrations (2, 4, 6 and 8%) in cv. Jaerla (early) and cv. Baraka (late) was studied. Tuberisation was scored after 4 (dark) or 8 (light) weeks. Ancymidol significantly increased tuberisation under LD-SD for any sucrose concentration in both cultivars. Ancymidol also significantly increased tuberisation under LD-dark for 6% sucrose in both cultivars. Tuberisation in cv. Jaerla was significantly higher than in cv. Baraka for any photoperiodic treatment in the presence or absence of ancymidol with 4, 6 or 8% sucrose. The photoperiod SD-SD resulted in the higher level of tuberisation for any combination of sucrose, cultivar and ancymidol. The possible role of ancymidol is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358177
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 33
    Electronic Resource
    Electronic Resource
    Some sprouting characteristics of microtubers (1999)
    Springer
    Potato research 42 (1999), S. 611-617 
    Details
    ISSN: 1871-4528
    Keywords: dormancy ; potato ; losses ; Solanum tuberosum L. ; seed potato production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Microtubers can be stored longer, transported and handled easier than plantlets, but they have some disadvantages related to long dormancy. Dormancy, number of sprouts per tuber and loss of microtubers under different storage temperatures were studied. Microtubers of four genotypes originated from different tuberization treatments (photoperiod combinations) were observed. We found that dormancy depended on cultivar and — in some cases — on the photoperiod treatment applied during tuberization. Generally, the dormacy was long and was greatly elongated by low storage temperature. One of the photoperiod treatments shortened while the other treatment prolonged the rest-period compared to the control, maybe due to a change in temperature accompanying the change in daily light (photoperiod combination). Besides, these treatments affected the number of sprouts per tuber. There was no significant difference in duration of dormancy between different tuber-size groups, but the loss increased significanctly with a decrease in tuber size. Based on this information we can use microtubers more effectively in the seed potato production programme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358179
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 34
    Electronic Resource
    Electronic Resource
    In vitro evaluation of resistance of potato cultivars toPhytophthora infestans (1999)
    Springer
    Potato research 42 (1999), S. 101-105 
    Details
    ISSN: 1871-4528
    Keywords: late blight ; testing methods ; electrolyte leakage ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The resistance of ten potato cultivars (Agria, Ajax, Désirée, Liseta, Kennebec, Majestic. Monalisa, Prima, Spunta and Tonda di Berlino) toPhytophthora infestans was analyzed in vitro using 8 fungal strains. An assay based on electrolyte leakage was used for screening leaves and tuber tissues with fungal culture filtrates. With almost all cultivars the resistance of leaves did not correlate with the resistance of tubers. Cv. Ajax appeared the least susceptible in both leaf and tuber tests, while the cv. Prima was the most susceptible in tuber tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358396
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 35
    Electronic Resource
    Electronic Resource
    In vitro shoot regeneration ofSolanum tuberosum cultivars: interactions of medium composition and leaf, leaflet, and explant position (1999)
    Springer
    Potato research 42 (1999), S. 141-151 
    Details
    ISSN: 1871-4528
    Keywords: auxin ; cytokinin ; potato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Shoot regeneration was investigated on explants from different leaves and leaflets of three potato cultivars Posmo, Folva and Oleva. Explants were excised from glasshouse grown plants and grown for 6 days on callus induction medium with indole-3-acetic acid or 2,4-dichlorophenoxyacetic acid. Explants were then transferred to auxin free shoot regeneration medium with gibberellic acid and 6-benzyladenine or zeatin. By using the optimum combinations and concentrations of plant growth regulators and by excision of explants from particular regions of proximal leaflets from newly unfolded leaves, shoot regeneration frequencies of 97.0% were obtained for cv. Posmo and 32.1% for cv. Folva. Shoot regeneration frequency of cv. Oleva was very low and could not be improved by the different treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358404
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 36
    Electronic Resource
    Electronic Resource
    Early potatoes in Italy with particular reference to Sicily (1999)
    Springer
    Potato research 42 (1999), S. 229-240 
    Details
    ISSN: 1871-4528
    Keywords: earliness ; planting season ; Mediterranean area ; off-season production ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In Italy, the early potato cultivars of greatest economic significance are those grown off-season, in a cycle which is generally much earlier than the typical spring-summer cycle. Of the area given over to early potatoes in Italy, more than 90% is in the southern regions. The economic value of this production is due to its extraseasonality, which allows much of the early potato harvest to be sold on foreign markets. In Sicily, more than 5000 ha of potato are grown, with a high frequency of potato crops on small plots. Early potatoes are often rotated with various fruits and vegetables, and the length of the cycle is variable, from 100 to 140 days. Choosing the most suitable cultivar is the most complex aspect of early potato growing. Of the criteria used, tuber growth rate has shown most validity. In Sicily two cultivars are mainly grown: Sieglinde and the more recent but well-established Spunta. Agricultural techniques used for early potato cultivation vary depending on the area. An overview of the agronomic practices used in different areas is given in this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357855
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 37
    Electronic Resource
    Electronic Resource
    Recent developments in potato research: scientific highlights of the EAPR conference in Sorrento, Italy, May 1999 (1999)
    Springer
    Potato research 42 (1999), S. 381-395 
    Details
    ISSN: 1871-4528
    Keywords: agronomy ; breeding ; pathology ; physiology ; Solanum tuberosum L. ; storage ; utilisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary This contribution presents highlights of the oral and poster presentations in the various sessions of the 14th Triennial Conference of the European Association for Potato Research, held in Sorrento, Italy, May 1999. It is based on the reports of the session chairpersons and the book of abstracts. The paper reports the progress made in many aspects of potato research, but also stresses the need for further collaborative work, especially in the fields of molecular physiology, marker assisted breeding, control of late blight, potato tuber moth and other pests and diseases, stress physiology and stress resistance, and sustainable cropping systems with both short and long cycle potato crops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357864
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 38
    Electronic Resource
    Electronic Resource
    Characterisation of genes isolated from a potato swellingstolon cDNA library (1999)
    Springer
    Potato research 42 (1999), S. 31-42 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; tuberisation ; extensin ; acyl carrier protein thioesterase ; high mobility group protein ; gene expression ; plant development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In screening to isolate a full-length copy of a previously isolated cDNA clone, a further three cDNAs were also isolated from a library prepared from sub-apical swelling-stolon tissue of potato (Solanum tuberosum L.). Sequence analysis showed these clones to be similar to extensin-like protein genes, acyl carrier protein thioesterase genes and high mobility group protein genes, respectively. A further cDNA, isolated by subtractive hybridisation, was similar to a tomato cDNA previously isolated on the basis of its down-regulation following nematode infection. While all the newly isolated genes were expressed in swelling stolons, for most, maximal expression was seen to be in stem tissue. Possible roles for these genes in the development of potato plants are discussed, as is the significance of gene expression in stems and stolons to the process of tuberisation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358389
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 39
    Electronic Resource
    Electronic Resource
    Residues of free and bound maleic hydrazide in potato tubers (1999)
    Springer
    Potato research 42 (1999), S. 89-93 
    Details
    ISSN: 1871-4528
    Keywords: analysis ; HPLC ; β-glucoside ; 1,2-dihydro-3,6-pyridazinedione ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The method of Vadukul (1991) for determining maleic hydrazide (MH) was modified and gave recoveries of free MH of 89%±4%. The values recorded on individual tubers ranged from 2–14 mg kg−1. Maleic hydrazide was evenly distributed throughout the tuber (peel, outer and inner flesh) but concentration increased slightly as tuber size increased. The concentration of free MH decreased from 7 to 3 mg kg−1 over the storage period of 5 1/2 months. Acid hydrolysis released substantial amounts of MH particularly from older potatoes (13 mg kg−1) compared with 6 mg kg−1 from new potatoes, implying that free MH is gradually converted to a bound form with time after treatment. No evidence was found for the presence of a β-glucoside of MH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358394
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 40
    Electronic Resource
    Electronic Resource
    World trends and patterns in the potato crop: An economic and geographic survey (1999)
    Springer
    Potato research 42 (1999), S. 241-264 
    Details
    ISSN: 1871-4528
    Keywords: global distribution ; prospects ; diversification ; specialization ; price risk ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary We examine the changing character of supply and demand for potatoes over time and space with an eye towards implications for agricultural research. Diversification in consumption and specialization in production are our organizing themes. The foundation for comparative analysis is a map of the global distribution of potato growing area. We highlight the adverse impact of price risk on specialization and discuss several sources of uncertainty that condition the size but not the direction of major trends.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357856
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 41
    Electronic Resource
    Electronic Resource
    In vitro production of potato microtubers in liquid medium using temporary immersion (1999)
    Springer
    Potato research 42 (1999), S. 499-504 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; microtuber ; liquid medium ; temporary immersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary CIRAD developed a new apparatus for plant tissue culture, using temporary immersion in a liquid medium. This apparatus was adapted to the microtuber production in potato. The procedure is as follows: single node cultivation on MS medium containing 30 g/l sucrose in the light for 2 weeks, induction of microtuberisation with 80 g/l sucrose over a 2 week period in the light, followed by a further 6 weeks in the dark. All experiments were performed at 20 °C. The basic vessel had a capacity of approximately 11;30 nodes were cultivated per vessel. Depending on the cultivars tested (Bintje, Ostara and Désirée) 47 to 115 microtubers were harvested per vessel. Between 30 and 60% of the microtubers weighted over 0.5 g and between 10 and 40% over 0.8 g. Sprouting is still under investigation. Preliminary results indicate that the dormancy period was relatively short and several stems were obtained per microtuber. These results seem to be better than those usually reported. Only one simple protocol has been tested and further improvements are probably easy to obtain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358166
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 42
    Electronic Resource
    Electronic Resource
    In vitro induction of potato tuberization by organic acids (1999)
    Springer
    Potato research 42 (1999), S. 585-591 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; microtubers ; acetic acid ; propionic acid ; asscorbic acid ; salicylic acid ; acetylsalicylic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Potato microtubers are usually induced in media containing growth regulatory, typically cytokinins and growth retardants. However, since these substances may imbalance the physiology of the cultured explants and cause adverse carry-over effects on the subsequent performance of the microtubers, the potential acid-induction of in vitro-mass tuberization was investigated as an alternative. For this purpose, a range of explant types (stolons, single-node or apex-containing multinodal sections), organic acids (acetic, propionic, ascorbic, acetylsalicylic or salicylic acid), and photoperiods (continuous dark, 8 or 16 h photoperiod) were established. Gellified medium or raft membranes on liquid medium were also tested. Although variations due to explant type, photoperiod, organic acid supplemented, and medium type were found, all organic acids tested under the different experiments caused tuberization. Multiple tuber formation or bigger tubers did not develop on multinodal explants. In terms of tuberization rate and mean tuber weight, gellified medium performed better than liquid medium with rafts. The recently established role of the salicylic and acetylsalicylic acids on tuberization is corroborated by our system. The results with the acetic, propionic and ascorbic acids show that in vitro hormone-free tuberization can be easily and rapidly achieved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358175
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 43
    Electronic Resource
    Electronic Resource
    Salinity stress and sodium-potassium interactions in micropropagated potatoes (1999)
    Springer
    Potato research 42 (1999), S. 73-78 
    Details
    ISSN: 1871-4528
    Keywords: growth parameters ; K+/Na+ ratio ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Increased potassium (K) fertilization of saline soils has been implicated in alleviating salt stress in plants. We examined whether varying K concentrations in Murashige & Skoog (MS: 1962) basal medium could affect salt (NaCl) stress in micropropagated potatoes. Plantlets of cvs Sierra and Russet Burbank were evaluated after 1 month of growth in a medium containing 0. 40, or 80 mM NaCl and 6,20, or 30 mMK. The medium K was adjusted using KNO3 while total nitrogen was kept constant using NH4NO3. Growth parameters were less affected in Sierra than Russet Burbank, and roots were less affected than shoots, as the medium salinity increased. Tissue Na levels were greater when the medium K was 6 mM compared with 20 mM MS control. The medium K concentration 50% greater than MS control did not promote growth and did not limit tissue Na levels. While this should be confirmed by field assessment, our results suggest that while K deficiency promotes salt damage, its addition beyond the usual fertilizer recommendations is not beneficial in alleviating salinity stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358392
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 44
    Electronic Resource
    Electronic Resource
    Large scale commercial production of potato minitubers, using in vitro techniques (1999)
    Springer
    Potato research 42 (1999), S. 607-610 
    Details
    ISSN: 1871-4528
    Keywords: seed production ; Greece ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Large scale, commercial production of potato minitubers, cvs Spunta, Jaerla and Kennebec, has been carried out in VITRO HELLAS S.A. since 1995, according to protocols based on in vitro methods. Apical meristems were cultured on MS medium supplemented with 1 μM IBA, 20 g/l sucrose and 6 g/l agar (pH 5.8). Subculture was carried out every 15 days. Multiplication rate was 4–5 per cycle. Self-rooted microplants were transferred into screen houses (200 plants/m2) in a mixture of peat and perlite 1∶1 (v/v). Cultivation period was 15 August to 15 November each year. During the period 1995–1997, the number of minitubers produced/plant was 2.07 for cv. Spunta, 1.85 for cv. Jaerla and 2.52 for cv. Kennebec and their average weights were 10.8 g, 10.9 g and 9.8 g, respectively. The percentage of minitubers〈10 mm in diameter was 2%, 50.1% were 10–20 mm and 47.9% were〉20 mm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358178
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 45
    Electronic Resource
    Electronic Resource
    The potential for production of high quality seed potatoes in Tierra del Fuego Island, Argentina (1999)
    Springer
    Potato research 42 (1999), S. 9-23 
    Details
    ISSN: 1871-4528
    Keywords: cultivar ; virus diseases ; nematodes ; ground cover ; physiological age ; seed production ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In Argentina, different areas are suitable for seed potato production: however, each has particular problems, mainly related to different pest and diseases. Tierra del Fuego Island is well isolated from traditional potato growing areas. Therefore, it was tested for its potential for seed production. The cultivars Achatt. Mailén INTA. Pampeana INTA and Spunta were grown in Río Grande, San Pablo and Ushuaia from 1991–1994. Nematode presence and aphid population dynamics were recorded. Average tuber yield ranged from 20.1–37.6 t ha−1. After three years PVY and PLRV remained low (0–1% for different cultivars and locations). Moreover, seed tubers obtained were physiologically young. Long days, early frosts and strong winds may limit tuber yield in some years. The island can be considered as an ecological “safe haven” and is very suitable to obtain healthy and physiologically adequate seed potatoes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358387
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 46
    Electronic Resource
    Electronic Resource
    Explosion and combustion processes associated with the fogging of stored potatoes (1999)
    Springer
    Potato research 42 (1999), S. 25-29 
    Details
    ISSN: 1871-4528
    Keywords: chlorpropham ; particulates ; dusts ; solvents ; ignition source ; explosive limits ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary An appraisal was undertaken of the key factors involved in explosion and combustion processes mainly associated with the fogging of chlorpropham formulations into potato stores. The key factors considered are source of ignition, solvents, explosive limits of solvents, the presence and atmospheric concentrations of particulate clouds and the role of particulate material in dust explosions. Also the sequence of events that takes place in a dust explosion, including critical concentrations of dust required to initiate the reactions involved and the particular relevance of the above events to the behaviour of chlorpropham fogs both at the time of application and when distributed throughout a store. The relevance of fine dust already present in the store to the initiation of explosions, particularly secondary explosions, which are considered to be a major cause of concern due to their severity, is also emphasised.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358388
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 47
    Electronic Resource
    Electronic Resource
    The recovery of maleic hydrazide from processed potato products (1999)
    Springer
    Potato research 42 (1999), S. 95-99 
    Details
    ISSN: 1871-4528
    Keywords: analysis ; HPLC ; filter paper model ; Diels-Alder reaction ; 1,2-dihydro-3,6-pyridazinedione ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A method used for estimating extractable maleic hydrazide (MH) concentrations in fresh potato material, concentration range 5–17 mg kg−1, was found not to be suitable for processed potato products (10–33% recoveries) although, boiling potato pieces enhanced recovery by 20%. Each step of the determination was examined and a modified procedure developed with particular emphasis on the extraction of MH from the dried potato matrix, and the quality of the HPLC column used. Potato slices and model systems based on filter papers plus additives were used. Recoveries from fried potato slices were 74±6%. Based on the effect of glucose in reducing extractable MH recoveries, it is suggested that the remainder of the MH (20–25%) is converted into a conjugated structure on reaction with dehydrated sugar (Diels-Alder reaction).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358395
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 48
    Electronic Resource
    Electronic Resource
    Differentiating PVYNTN by unique single-restriction cleavage of PCR products (1999)
    Springer
    Potato research 42 (1999), S. 215-221 
    Details
    ISSN: 1871-4528
    Keywords: potato virus Y ; strain differentiation ; RFLP ; potato tuber necrotic ringspot disease ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A procedure for differentiating PVYNTN from PVYN is described and is based on the unique cleavage of their respective PCR products with strain specific restriction endonucleases. The PCR products corresponding to the 5′ end of the N and NTN strains of PVY were cloned and sequenced, and a restriction map was constructed which included common enzymes that were used for the differentiation of PVYNTN. Unique, single cleavage of PCR products derived from the 5′ end of the PVYNTN genome by Nco I, and that of the N-strain of PVY by Bgl II restriction endonuclease were demonstrated. The specific digestion patterns in polyacrylamide gel were used for the unequivocal differentiation between the N and NTN strains of the virus. Both single and mixed infections were detected in field samples of potatoes using this procedure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358411
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 49
    Electronic Resource
    Electronic Resource
    Breeding and physiological aspects of potato cultivation in the Mediterranean region (1999)
    Springer
    Potato research 42 (1999), S. 265-277 
    Details
    ISSN: 1871-4528
    Keywords: wild species ; gene introgression ; heat stress ; drought stress ; frost stress ; biotic stresses ; off-season production ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In the Mediterranean area the potato is a very important crop and can be cultivated throughout the year. However, tuber yields are generally much lower than those in Northern European countries. This is because the environmental and agro-economic conditions are different from those of Northern countries where most cultivars were developed. We feel that the objective for the “new Mediterranean potato” must be the availability of potato cultivars for each environment and for each planting season. Breeding programmes should focus on improving potato production within a specific agro-ecological Mediterranean area rather than improving crop production across areas. This paper reports aspects of potato breeding and physiology related to resistance to stress conditions in the Mediterranean area, with particular emphasis given to resistance to abiotic (heat, drought and frost) as well as biotic stresses. We also discuss the potential to produce seed tubers suitable for potato cultivation in the Mediterranean area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357857
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 50
    Electronic Resource
    Electronic Resource
    The return ofPhytophthora infestans, a potato pathogen that just won't quit (1999)
    Springer
    Potato research 42 (1999), S. 279-282 
    Details
    ISSN: 1871-4528
    Keywords: late blight ; mating types ; sexual recombination ; Solanum tuberosum L. ; diversification ; aggressiveness ; migration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Since the early 1980s and continuing through the end of the 20th century, potato late blight caused byPhytophthora infestans has become noticeably more problematic throughout the world. Exotic strains of the pathogen are largely responsible for the increased problems. The new strains were initially detected in Europe, but subsequently they have been detected in Asia, the Middle East, South America and North America. Populations in the Middle East and South America may represent secondary migrations from Europe. Several independent migrations have occurred such that migrant populations in North America are very different from those in Europe. Also, population structures ofP. infestans are different in different worldwide locations. In some locations the migrant strains are resistant to metalaxyl, but in other locations either migrant or indigenous strains may be resistant. In most locations, the migrant strains are more aggressive than the previous indigenous strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357858
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 51
    Electronic Resource
    Electronic Resource
    In vitro microtuberization: an evaluation of culture conditions for the production of virus-free seed potatoes (1999)
    Springer
    Potato research 42 (1999), S. 489-498 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; microtubers ; nodal cuttings ; in vitro tuberization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A tissue culture technique is described in which nodal cuttings ofSolanum tuberosum L. are induced to form usable microtubers in order to produce high health status of the seed potato genotypes cultivated in Switzerland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358165
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 52
    Electronic Resource
    Electronic Resource
    Tolerance to abiotic stresses in potato plants: a molecular approach (1999)
    Springer
    Potato research 42 (1999), S. 333-351 
    Details
    ISSN: 1871-4528
    Keywords: genes ; transgenic plants ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Continuing study of the potato plant's response to stressful conditions has led to the identification of a large number of plant genes whose expression, is regulated by external stimuli. Stress-induced genes can be broadly divided into functional or regulatory genes. To the first category belong genes encoding proteins or enzymes of plant metabolic pathway, of molecules involved in repairing cellular damages and/or indispensable for restoring a new cellular homeostasis compatible with the external conditions. The other class includes genes primarily involved in the perception and/or intracellular transduction of the stress signal, such as kinases, phosphatases or transcription, factors. The research objectives in the field of plant stress tolerance has recently evolved from a mere cloning and description of stress-induced genes to the design of the best strategy of producing transgenic plants tolerant to environmental constraints. It is well known that stress tolerance is a complex trait, requiring the coordinated regulation of a network of genes that act synergistically and additively. At best, manipulation of one single down-stream gene may contribute only partially to the tolerance of the transgenic plants. Recent studies have shown that it is feasible to regulate the level of expression of many down-stream stress-induced genes in a coordinated fashion by regulating the expression of genes encoding transcription factors able to bind DNA motifs in the promoter of stress-induced genes. However, the constitutive high level of expression of transcription factors often causes detrimental phenotypic effects. This drawback could be bypassed by putting genes for transcription factors under the control of inducible promoters. In this way, endogenous tolerance genes are activated only when the stress event occurs, minimizing the negative pleiotropic effect. Novel technology (reverse genetics, DNA microarrays, mRNA differential display, T-DNA tagging, complementation and over-expression of plant cDNA in yeast as model for cellular stress tolerance), improvement of genetic transformation techniques (multiple gene transfer, gene targeting by homologous recombination) as well as a better efficiency of foreign gene expression (discovery of plant promoters with cell-specific, tissue-specific, developmental stage-specific, and/or inducible patterns of expression) will give a tremendous impulse to produce stress tolerant commercial cultivars of the main crops through genetic engineering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357861
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 53
    Electronic Resource
    Electronic Resource
    A genetic analysis of quantitative resistance to late blight in potato: towards marker-assisted selection (1999)
    Springer
    Molecular breeding 5 (1999), S. 399-415 
    Details
    ISSN: 1572-9788
    Keywords: potato ; late blight ; quantitative resistance ; marker-assisted selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Late blight caused by the oomycete Phytophthora infestans is the most important fungal disease in potato cultivation worldwide. Resistance to late blight is controlled by a few major genes (R genes) which can be easily overcome by new races of P. infestans and/or by an unknown number of genes expressing a quantitative type of resistance which may be more durable. Quantitative resistance of foliage to late blight was evaluated in five F1 hybrid families originating from crosses among seven different diploid potato clones. Tuber resistance was evaluated in four of the families. Two of the families were scored for both foliage maturity and vigour. The five families were genotyped with DNA-based markers and tested for linkage with the traits analysed. QTL (quantitative trait locus) analysis identified at least twelve segments on ten chromosomes of potato having genes that affect reproducibly foliage resistance. Two of those segments also have major R genes for resistance to late blight. The segments are tagged by 21 markers that can be analyzed based on PCR (polymerase chain reaction) with specific oligonucleotide primers. One QTL was detected for tuber resistance and one for foliage vigour. Two QTLs were mapped for foliage maturity. Major QTL effects on foliage and tuber resistance to late blight and on foliage maturity and vigour were all linked with marker GP179 on linkage group V of potato. Plants having alleles at this QTL, which increased foliage resistance, exhibited decreased tuber resistance, later maturity and more vigour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009623212180
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 54
    Electronic Resource
    Electronic Resource
    Similarity of QTLs detected for in vitro and greenhouse development of potato plants (1999)
    Springer
    Molecular breeding 5 (1999), S. 417-428 
    Details
    ISSN: 1572-9788
    Keywords: QTLs ; tuberization earliness ; in vitro conditions ; sugars in leaf exudate ; marker-assisted selection ; potato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A relationship between quantitative trait loci (QTLs) detected for in vitro and greenhouse growing conditions was studied in a backcross population of 155 genotypes derived from a haploid potato (Solanum tuberosum) and a diploid wild species (S. berthaultii). Both plant height and tuberization earliness were characterized under two growing conditions. Main-effect QTLs and QTLs identified only through interaction were detected for each of the traits. For traits associated with plant height as well as for traits associated with early tuberization, the most significant QTL detected for greenhouse cultivated plants was also found when the population was grown in vitro. The most significant QTL for earliness of tuberization in vitro, which was located on chromosome 8, coincides with that detected for sucrose concentration in leaf exudate. The absence of a S. berthaultii allele was associated both with a higher amount of sucrose in the exudate and with earlier in vitro tuber formation. Epistasis was found to have a significant effect on all traits investigated. The QTL model that included main-effect QTLs and all significant interactions explained 83–88% of the total genetic variance for each of the developmental traits. The possibility of using an in vitro system combined with marker-assisted selection for preliminary selection of early tuberizing clones is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009686220862
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 55
    Electronic Resource
    Electronic Resource
    QTL for field resistance to late blight in potato are strongly correlated with maturity and vigour (1999)
    Springer
    Molecular breeding 5 (1999), S. 387-398 
    Details
    ISSN: 1572-9788
    Keywords: potato ; late blight ; QTL ; Linkage mapping ; earliness ; vigour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Field resistance to Phytophthora infestans, the causal agent of foliage and tuber blight in cultivated potatoes, earliness (maturity) and vigour, were examined in a diploid segregating potato population grown in replicated trials over three consecutive growing seasons. A genetic linkage map of this population was constructed in parallel using PCR-based SSR, AFLP and CAPS markers. Analysis of the trait scores alongside the marker segregation data allowed the identification of regions of the genome which were significantly correlated with components of the respective characters. The most significant associations for all four traits were with marker alleles on potato linkage group V originating from the male (susceptible) parent. In the case of foliage resistance to late blight, the positions of the majority of the effects, which were located on eleven of the twelve potato linkage groups, have been detected in previous [16] and parallel studies [21]. The absence of Solanum demissum-derived R genes for hypersensitive response to late blight and the co-localisation of QTL for resistance, vigour and earliness suggest that developmental and/or physiological factors play a major role in determining the level of foliage resistance in this population. In contrast with previous findings, a negative correlation was found between foliage and tuber blight resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009601427062
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 56
    Electronic Resource
    Electronic Resource
    Phytophthora infestans Secretes Extracellular Proteases with Necrosis Inducing Activity on Potato (1999)
    Springer
    European journal of plant pathology 105 (1999), S. 753-760 
    Details
    ISSN: 1573-8469
    Keywords: hypersensitive-like response ; Phytophthora infestans ; potato ; proteases ; Solanum tuberosum ; zoospores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The proteolytic activity present in the extracellular preparation (ECP) from suspension media of infective structures of the late blight pathogen Phytophthora infestans was partially characterized. The proteolytic activity was analyzed in gelatin-containing SDS-PAGE. A discrete band of digested gelatin was visualized at approximately 45 kDa in ECPs from zoospores and germinating cysts media. Treatment of ECP with the protease inhibitor phenylmethylsulfonyl fluoride (PMSF) or incubation at 100°C for 5 min completely abolished the proteolytic activity in the zymograph assay. When microinjected in potato leaves, ECP induce localized necrosis within 24 h post inoculation. This necrosis appeared in potato and was not visible in two non-host plants. Moreover, the necrosis seems to be dependent on active host metabolism. Treatments of ECP with Proteinase K, PMSF and boiling inhibited their ability to induce the necrotic response. These results suggest a correlation between, proteolytic and necrosis-inducing activities in ECP. A preliminary characterization with protease inhibitors suggests that the ECPs contain serine protease(s).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008734527651
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 57
    Electronic Resource
    Electronic Resource
    A Laboratory Assay for Phytophthora infestans Resistance in Various Solanum Species Reflects the Field Situation (1999)
    Springer
    European journal of plant pathology 105 (1999), S. 241-250 
    Details
    ISSN: 1573-8469
    Keywords: Phytophthora infestans ; potato ; wild Solanum spp. ; resistance ; detached leaves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Physiological and molecular research on resistance responses of Solanum tuberosum cultivars and partially resistant Solanum species to Phytophthora infestans requires a reliable resistance test that can be used in the laboratory. Laboratory tests performed on detached leaves and intact plants were compared with field tests for similarity of late blight reactions. Detached leaves from field-grown plants were as resistant as detached leaves from climate chamber-grown plants when challenged with P. infestans. However, detached leaves incubated in covered trays at high relative humidity were more susceptible than detached leaves kept in open trays or leaves on intact plants. The incubation conditions of detached leaves in covered trays rather than detachment itself appeared to affect the resistance expression. Detached leaves of some wild Solanum genotypes became partially infected, whereas intact plants were completely resistant when inoculated. Inoculation of leaves on intact plants, however, resulted in lower infection efficiencies. These limitations should be taken into account when choosing the appropriate inoculation method for specific purposes. For resistance screening, laboratory tests proved to be a good alternative for field tests. The ranking of resistance levels for twenty plant genotypes was similar under laboratory and field conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008710700363
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 58
    Electronic Resource
    Electronic Resource
    The bioavailability of magnesium from Wakame ( Undaria pinnatifida) and Hijiki (Hijikia fusiforme) and the effect of alginic acid on magnesium utilization of rats (1999)
    Springer
    Plant foods for human nutrition 53 (1999), S. 265-274 
    Details
    ISSN: 1573-9104
    Keywords: Bioavailability ; Magnesium ; Hijiki ; Sodium alginate ; Rat ; Wakame
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The bioavailability of magnesium from Wakame and Hijiki, and the effects of alginic acid on absorption of dietary magnesium were examined in five groups of rats fed either control, Wakame, Hijiki, AW (containing the same amount of alginate as in the Wakame) and AH (containing the same amount of alginate as in the Hijiki) diets, and animals fed a low magnesium diet (LMg) (twentieth amount of magnesium in the original mineral mixtures as the control). Food intake and body weight gain were decreased by adding sodium alginate to the diets. A large amount of calcium accumulated only in the kidneys of the rats fed the LMg diet. Serum magnesium concentration decreased only in the LMg group. The magnesium content in the defatted left femurs did not differ between the control and Wakame fed animals and also among the animals eating Wakame, Hijiki and AW diets. The breaking force of the right femurs did not differ among all the groups except the LMg group. The ratio of apparent magnesium absorption (%) of the control, LMg, Wakame, Hijiki, AW and AH groups was 82.2, 72.7, 66.9, 50.8, 69.3 and 54.2 in the first experimental period, and was 75.3, 52.1, 57.7, 46.9, 62.6 and 60.5 in the second experimental period, respectively. It was clear that the bioavailability of magnesium in the Wakame fed rats was higher than in those eating the Hijiki. Large amounts of sodium alginate lowered magnesium absorption from the diet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008082112178
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 59
    Electronic Resource
    Electronic Resource
    Characterisation of resistance to potato leafroll virus accumulation in Solanum phureja (1999)
    Springer
    Euphytica 108 (1999), S. 137-144 
    Details
    ISSN: 1573-5060
    Keywords: ELISA ; genetic modification ; PLRV ; potato ; Solanum phureja ; virus resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Strong resistance to accumulation of potato leafroll virus (PLRV) was identified in a clone of the diploid potato species Solanum phureja (cv. ‘Egg Yolk’, clone 5010) using a quantitative enzyme-linked immunosorbent assay (ELISA). The resistance is expressed very strongly in leaf tissue (virus could not be detected in leaves of some plants although other tissues were infected) but less strongly in petiole and stem tissue of infected plants. The titre of PLRV in leaves of S. phureja (5010) is approximately 2%, or less, of the titre in S. tuberosum cv. Maris Piper. The pattern of virus accumulation in different tissues of S. phureja (5010) and the distribution of virus-infected cells in phloem bundles suggest that this resistance is different to a similar form of resistance to PLRV accumulation previously identified in clones of Solanum tuberosum. Plants of S. phureja (5010) were transformed with the coat protein gene of potato leafroll virus (PLRV). Transgenic lines of S. phureja (5010) expressing transgene RNA transcript were no more resistant to aphid-borne infection with PLRV or to virus accumulation than were non-transgenic lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003668629040
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 60
    Electronic Resource
    Electronic Resource
    Crossability between cultivated and wild tuber-and non-tuber-bearing Solanums (1999)
    Springer
    Euphytica 109 (1999), S. 51-67 
    Details
    ISSN: 1573-5060
    Keywords: Solanum ; crossability ; 2n gametes ; hybridization ; wild species ; potato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The cultivated potato has over 200 extant wild relatives many of which contain genes valuable for disease resistance, hardiness, processing and agronomic traits. Crossability of these wild species directly with the cultivated potato is complicated by several reproductive phenomena such as stylar and ploidy barriers and Endosperm Balance Numbers (EBN). However, a systematic analysis of crossability with many of these wild relatives has never fully been examined. Reciprocal crosses were made between cultivated potato and over 400 wild potato accessions; stylar barriers and 2n gamete production were examined as was the fertility of many of the putative hybrids. Generally, the seed/fruit ratio increased the more closely related the species were to the cultivated potato. However, a few crosses were successful in spite of predicted failure due to ploidy or EBN differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003710817938
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 61
    Electronic Resource
    Electronic Resource
    Vertical resistance to late blight in wild potato species from Argentina (1999)
    Springer
    Euphytica 110 (1999), S. 133-138 
    Details
    ISSN: 1573-5060
    Keywords: Phytophthora infestans ; potato ; resistancescreening ; Solanum ; vertical resistance ; wild species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The possible presence of vertical resistance to late blight conferred by R genes in Argentine wild Solanum species, which presumably have not evolved under the pressure of the fungus, was investigated. Solanum microdontum, S. commersonii and S. chacoense clones were tested in the greenhouse and with detached leaves in the laboratory after inoculation with a complex race and a non-virulent race of Phytophthora infestans. Two progeny tests were carried out to assess the performance of contrasting parents in regards to their resistance. A varying frequency of incompatible clones was detected among the species, with S. microdontum having the higher proportion of clones yielding incompatible reactions both in the laboratory and in the greenhouse. S. chacoense and S. commersonii showed a small but still considerable frequency of incompatible clones. The progeny tests confirmed the presence of R genes in a S. commersonii cross and their absence in a S. chacoense cross. The unexpected presence of R genes, its evolutionary significance and the consequences on the use of these species in breeding is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003793227338
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 62
    Electronic Resource
    Electronic Resource
    Marker-assisted sampling of the cultivated Andean potato Solanum phureja collection using RAPD markers (1999)
    Springer
    Genetic resources and crop evolution 46 (1999), S. 547-555 
    Details
    ISSN: 1573-5109
    Keywords: core collection ; germplasm ; molecular marker ; potato ; RAPD ; Solanum phureja
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The potato crop originated in the Andean highlands where numerous farmer's varieties and non-cultivated wild species exist. An Andean potato collection is held in trust at the International Potato Center (CIP) to preserve the biodiversity of this crop and ensure the supply of germplasm for potato improvement worldwide. A core collection representing the biodiversity of the Andean potato germplasm is under construction using morphological, molecular, and geographic data. One of the eight cultivated potato species, Solanum phureja, has been genotyped using the RAPD technique. A protocol suitable for large germplasm collection genotyping has been developed to process numerous samples at reasonable costs. From 106 RAPD primers evaluated, we have selected 12 primers yielding 102 polymorphic markers, which unambiguously discriminated all 128 accessions but 2 that are possible duplicates. The S. phureja germplasm collected throughout the Andean countries appears to have a homogeneous genetic constitution. There was no clear geographic pattern as indicated by cluster analysis of the RAPD data. A sub-group of 20 accessions has been identified on the basis of the marker data and selected to maximize molecular (RAPD) variance and polymorphism. The probability of capturing equal amounts of marker polymorphism in this sub-group of 20 accessions by random sampling is less than 40%. This set accessions represents our first group of accessions that may constitute a core of the S. phureja collection. This tentative core will be challenged for diversity content by alternate markers and agronomic traits. Hence, the methodology for sampling less than 10% of the base collection, proposed for core collections by Brown (1989), can be based on molecular marker data provided cost-efficient fingerprints are developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008724007888
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 63
    Electronic Resource
    Electronic Resource
    Expression of nonacclimated freezing tolerance and cold acclimation capacity in somatic hybrids between hardy wild Solanum species and cultivated potatoes (1999)
    Springer
    Euphytica 107 (1999), S. 1-8 
    Details
    ISSN: 1573-5060
    Keywords: freezing tolerance ; potato ; Solanum brevidens ; Solanum commersonii ; Solanum tuberosum ; somatic hybrids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The expression of freezing tolerance was characterized in interspecific somatic hybrids between S. tuberosum (tbr) and two cold-hardy wild species, S. brevidens (brd) and S. commersonii (cmm). The nonacclimated freezing tolerance (NA) and acclimation capacity (ACC, increase in freezing tolerance in response to low nonfreezing temperature), two main genetic components of freezing tolerance, were evaluated separately. In contrast to cmm, which exhibited excellent NA and ACC, the freezing tolerance of brd was mainly due to ACC. However, the ACC of brd was only moderately expressed in the somatic hybrids. The NA of cmm was also suppressed in combination with tbr genomes. However, with acclimation, some of the tbr (+) cmm somatic hybrids achieved freezing tolerance comparable to pure hardy species such as brd used in this study. Analysis of chloroplast DNA type by RFLP markers revealed no significant difference in ACC between somatic hybrids carrying chloroplasts from either tbr or cmm. The reasons for the reduced expression of freezing tolerance from either the brd or cmm parent and the utilization of these somatic hybrids in breeding programs are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003583706491
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 64
    Electronic Resource
    Electronic Resource
    Ralstonia (Pseudomonas) solanacearum Race 3 (Biovar 2) in Surface Water and Natural Weed Hosts: First Report on Stinging Nettle (Urtica dioica) (1999)
    Springer
    European journal of plant pathology 105 (1999), S. 307-315 
    Details
    ISSN: 1573-8469
    Keywords: bittersweet ; brown rot ; overwintering ; pathogenicity ; potato ; Solanum dulcamara
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The population dynamics of the brown rot bacterium Ralstonia (Pseudomonas) solanacearum in surface water of two selected water-areas were monitored over a two-year period. In some cases during summer, high bacterial numbers (up to 106 cfu l−1) were observed. In a host plant survey a few plants of stinging nettle (Urtica dioica) were found to be a natural host of the bacterium when plants were growing with their roots in contaminated water. The significance of U. dioica in the epidemiology of the brown rot bacterium is not yet known and subject to further investigation. Pathogenicity of R. solanacearum to stinging nettle (U. dioica) and bittersweet (Solanum dulcamara) was demonstrated in a greenhouse experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008795417575
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 65
    Electronic Resource
    Electronic Resource
    Detection and Quantification of Spongospora subterranea f. sp. subterranea in Soils and on Tubers Using Specific PCR Primers (1999)
    Springer
    European journal of plant pathology 105 (1999), S. 905-915 
    Details
    ISSN: 1573-8469
    Keywords: cystosori ; internal transcribed spacer regions ; plasmodiophorids ; potato ; powdery scab ; soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract PCR-based methods were developed for the detection and quantification of the potato pathogen Spongospora subterranea f. sp. subterranea (S. subterranea) in peel, tuber washings and soil. A partial sequence was obtained for S. subterranea ribosomal DNA and specific PCR primers (Sps1 and Sps2) were chosen from the internal transcribed spacer regions. These primers amplified a 391 bp product from S. subterranea DNA but did not amplify DNA from potato or a range of soil-borne microbes, including related species. Diluted S. subterranea DNA was detected at a concentration equivalent to 25×10−5 cystosori or 1 zoospore per PCR. Amplification was detected from peel and washings of infected and apparently healthy tubers, but not from peel of Scottish classified seed potatoes or axenically micropropagated potatoes. A rapid method for extracting S. subterranea DNA from soils was developed. This yielded DNA pure enough for PCR within 3 h and facilitated the detection of 1–5 cystosori per gram of soil. A PCR quantification technique was developed involving comparison of product ratios obtained after co-amplification of S. subterranea DNA along with an internal standard (competitor DNA fragment). This quantitative technique was also adapted for use in soil. PCR detection of S. subterranea in soil was considerably more sensitive than previously reported immunoassays and was quicker and easier than conventional bait plant bioassays. Such an assay could be useful for developing disease risk assessments for field soils and seed potato stocks and for future studies on the ecology and control of S. subterranea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008782309333
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 66
    Electronic Resource
    Electronic Resource
    Glycoalkaloid accumulation during tuber development of early potato cultivars (1998)
    Springer
    Potato research 41 (1998), S. 117-125 
    Details
    ISSN: 1871-4528
    Keywords: α-solanine ; α-chaconine ; C:S ratio ; glycoalkaloid content ; tuber size ; individual tubers ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Plants of early potato cultivars were sampled at successive harvests during tuber development and individual tubers were analysed for α-solanine and α-chaconine using high-performance liquid chromatography. Mean tuber total glycoalkaloid concentration (α-solanine plus α-chaconine) per plant decreased with time and statistically significant differences between cultivars were observed in the patterns of decline during tuber growth. The mean tuber ratio of α-chaconine to α-solanine increased during tuber development and was also affected by genotype. Total glycoalkaloid concentration for individual tubers of marketable sizes (up to 50 g fresh weight) exceeded the safety limit of 20 mg per 100 g fresh weight for cultivars Home Guard and British Queen but not for Rocket. These differences were attributable to differences in both rates and patterns of glycoalkaloid accumulation during tuber development, although in all cultivars results were consistent with glycoalkaloid accumulation occurring in the expanding peripheral cell layers of tubers for a considerable period after tuber initiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358434
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 67
    Electronic Resource
    Electronic Resource
    Aspects of fusion combining ability of dihaploidSolanum tuberosum L.: influence of the cytoplasm (1998)
    Springer
    Potato research 41 (1998), S. 155-162 
    Details
    ISSN: 1871-4528
    Keywords: potato ; mitochondria ; chloroplast ; protoplast fusion ; somatic hybridization ; cytoplasmic inheritance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Creation from 4x hybrid clones from protoplast fusion of 2x clones of potato was evaluated. Besides combined nuclear genomes, composition of the cytoplasm significantly influenced the phenotypic traits of hybrid clones. To ascertain the influence of parental cytoplasm on the success of protoplast fusion and regeneration of hybrid plants, data from 74 fusion combinations of 50 dihaploid clones were analyzed. The majority of dihaploid breeding clones belonged to the cytoplasm types Wα, Tβ and Wγ. When the closely related mt types α, β and γ were used, fusion combinations had a better combining ability compared with more distantly related cytoplasms δ and ⃛. Fusions containing the same mitochondrial type (homofusions) were not superior to closely related mitochondrial types. However, homofusions of cytoplasm type Wα yielded significantly more hybrids than homofusions of type Tβ. In general, parental cytoplasm types had little impact on the fusion combining behaviour. Thus the cytoplasm type of the fusion parents is not a suitable marker for predicting the combining ability in protoplast fusion experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358438
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 68
    Electronic Resource
    Electronic Resource
    External K requirement of young plants of potato, sugar beet and wheat in flowing solution culture resulting from different internal requirements and uptake efficiency (1998)
    Springer
    Potato research 41 (1998), S. 229-237 
    Details
    ISSN: 1871-4528
    Keywords: ratio ; root-shoot ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Potato, wheat and sugar beet were grown in a growth chamber in tanks with flowing solutions containing K-concentrations of 1.5, 5, 15, 50 and 200 μM to find reasons for different K contents of solution needed to reach 90% maximum dry matter accumulation (external K requirement). All species showed variation in dry matter accumulation with varying K levels. To reach 90% maximum dry matter accumulation potato needed 40 μM K, whereas wheat and sugar beet needed 6.4 and 4.4 μM K respectively. These differences in external K requirement could not be explained by differences in their internal K requirement since the internal requirement of potato (7.7% K) was about one and a half times of that of sugar beet (5.4%) but its external requirement was nine times of that of sugar beet. At low K supply potato plants showed a lower influx and a reduced root growth as compared with wheat and sugar beet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358193
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 69
    Electronic Resource
    Electronic Resource
    Inheritance of resistance toFusarium spp. and toPhytophthora infestans in crosses between Neotuberosum and Tuberosum potatoes estimated by seedling tests (1998)
    Springer
    Potato research 41 (1998), S. 267-275 
    Details
    ISSN: 1871-4528
    Keywords: potato ; dry rot ; Fusarium coeruleum ; F. sulphureum ; general combining abilities
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Neotuberosum clones with differing levels of resistance toFusarium coeruleum andFurarium sulphureum, and putative resistance toPhytophthora infestans, were selected and used in crosses with Tuberosum clones. The resulting progenies were assessed for their resistance to each of these pathogens and for breeders' preference. There was little correlation between disease scores for the twoFusarium species (r=0.21 and 0.34 for the Neotuberosum and hybrid clones respectively), indicating that resistance to each species is distinct. Statistical analyses revealed differences between the Neotuberosum parents and between the Tuberosum parents for all traits, but the Neotuberosum differences for late blight were not significant (P=0.10–0.05) when tested against the interaction between the two sets of parents. The interaction was significant forF. coeruleum and breeders' preference, but notF. sulphureum. No reciprocal differences were found. The only statistically significant correlation between traits for the 72 progenies was a small one (r=0.33; P=0.01–0.001) between the twoFusarium species; for all other pairs of traits r was less than 0.10. It is concluded that there are good prospects for combinding resistances to the twoFusarium species from different sources and also for achieving high levels of other desirable characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358196
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 70
    Electronic Resource
    Electronic Resource
    Heterosis and combining ability analysis for resistance to early blight (Alternaria solani) in potato (1998)
    Springer
    Potato research 41 (1998), S. 311-317 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; general combining ability ; specific combining ability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In an epiphytotic year of early blight, data were recorded on its incidence in 72 progenies (18 females x 4 males) and their parents planted in a randomised complete block design at the Punjab Agricultural University, Ludhiana, India. Combining ability analysis showed that both additive and non-additive gene action were important, with a preponderance of the latter in the inheritance of resistance to early blight. In general, progenies were as good as or better than mid-parent values. Crosses involving both or at least one parent with good general combining ability resulted in heterotic early blight resistant progenies. Promising parents and crosses were identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358963
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 71
    Electronic Resource
    Electronic Resource
    Rate of spread of PVYn by alateMyzus persicae (Sulzer) from infected to healthy plants under laboratory conditions (1998)
    Springer
    Potato research 41 (1998), S. 335-344 
    Details
    ISSN: 1871-4528
    Keywords: aphid ; epidemiology ; flight ; potato ; mosaic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Alate green peach aphids,Myzus persicae (Sulzer), tested in a flight chamber during their maiden flight period displayed behaviours ranging from repeated trivial flights to settling on the plants. The interaction of alate vector density and PVYn spread was dichotomous, virus spread was significantly related to vector density in some trials but virus spread was nil or limited and not significantly dependent on vector density in others. The green peach aphid colony used in these experiments provided a mixture of active and highly active alate populations. Results suggest that inactive and active vectors came from the active and highly active alate populations, respectively. Therefore, winged aphids within a species cannot all be attributed the same vector efficiency unless known to originate from the same population. At a 15% inoculum level the intercept for the regression model for the spread of PVYn was 5.03% indicating that there is a significant probability of propagation at aphid densities as low as one. However, over the range of aphid densities tested, the rate of spread per aphid was low, 0.08%, suggesting that reinfection of newly infected plants or movement interference between aphid vectors rapidly became important factors negatively affecting virus spread. Although these results cannot be directly transferred to field conditions they provide confirmation that lowM. persicae numbers can transmit unacceptable levels of mosaic and that low inoculum levels are required to decrease the risk of transmission by the small aphid numbers which cannot be realistically controlled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358966
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 72
    Electronic Resource
    Electronic Resource
    A simple and rapid method for the detection of potato spindle tuber viroid (PSTVd) by RT-PCR (1998)
    Springer
    Potato research 41 (1998), S. 1-8 
    Details
    ISSN: 1871-4528
    Keywords: immobilisation ; filter paper ; dot RT-PCR ; print RT-PCR ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A test procedure for PSTVd is described based on immobilisation of plant sap on filter paper, by dotting or tissue printing followed by RT-PCR. Tests were carried out using primarily and secondarily infected potato plants, primarily infected in vitro plants, and potato tubers. Print PCR was shown to be suitable for testing large samples of potato plants whereas dot PCR is recommended for in vitro plantlets and tuber tissue. Bulking one infected plant to 4 or 9 healthy plants gave reliable results with secondarily infected potato plants, but sometimes the test failed to detect PSTVd in primarily infected in vitro plants. Dotted and printed paper squares could be stored at 4°C for at least 2 weeks in Triton X-100 solution or under dry conditions. Storing at room temperature can lead to unreliable results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360256
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 73
    Electronic Resource
    Electronic Resource
    Progeny tests to identify diploid potato clones homozygous at loci controlling resistance to PLRV (1998)
    Springer
    Potato research 41 (1998), S. 219-228 
    Details
    ISSN: 1871-4528
    Keywords: homozygous genotypes ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Using potato parental lines homozygous at a locus or loci controlling resistance to potato leafroll virus (PLRV) can give advantages in the selection of resistant forms. In order to identify homozygous diploid clones their test-cross families were evaluated. All the clones that were test-crossed expressed resistance in primarily- and secondarily-infected plants and etiolated sprouts, and were derived from mating genotypes highly resistant to PLRV. Genotypes from test-cross families varied in resistance to PLRV, and one family was found which had only resistant genotypes, suggesting that the resistant parent of this progeny was homozygous at resistance loci. Evidence was gathered that resistance in some diploid clones may result from resistance to virus multiplication as well as restricted virus transport from leaves to tubers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358192
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 74
    Electronic Resource
    Electronic Resource
    Quantifying damage as percentage potato tuber volume lost per peeler stroke (1998)
    Springer
    Potato research 41 (1998), S. 277-287 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; quality ; bruising ; external ; internal ; model ; index
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Methods for quantifying external damage and bruising can be inaccurate and result in an index that is difficult to interpret. A new index was derived by taking measurements of peeled slices from cv. Record and developing a mathematical model to predict the percentage volume removed per peeler stroke for a range of potato cultivars. It was found that an average of 1.25% of the tuber volume was removed per peeler stroke. By counting the number of peeler strokes to remove damaged tissue and multiplying by 1.25, an estimate of the percentage tuber volume lost due to bruising or external damage can be obtained. The index can accommodate most types of damage and result in an index that is readily understood.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358197
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 75
    Electronic Resource
    Electronic Resource
    Variation in tuber pathogenicity ofPhytophthora infestans in the Netherlands (1998)
    Springer
    Potato research 41 (1998), S. 345-354 
    Details
    ISSN: 1871-4528
    Keywords: tuber blight ; Solanum tuberosum L. ; disease assessment ; fungal pathogenicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Variation in aggressiveness to tubers among isolates ofPhytophthora infestans sampled from three potato growing regions in the Netherlands was compared. Variation in the ability to infect tubers of cv. Bintje was found between isolates of each of the three regional populations. The most aggressive isolate of the old population matched the average level of the new population in its ability to infect tubers. As a consequence, the commonly used reference isolate VK 6C can no longer be considered to be representative of the present population ofP. infestans. Therefore it is recommended that testing tuber resistance for the official list of potato cultivars with this isolate should be discontinued. Tuber infection and subsequent spread of the fungus in the tuber tissues were not found to be correlated. The components of tuber pathogenicity studied were not correlated to pathogenicity factors in the foliage, as measured under growth chamber conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358967
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 76
    Electronic Resource
    Electronic Resource
    Potential for artefacts in the measurement of fructose and sucrose in extracts of potato tubers using the microplate reader assay (1998)
    Springer
    Potato research 41 (1998), S. 383-386 
    Details
    ISSN: 1871-4528
    Keywords: alcohol dehydrogenase ; phosphoglucose isomerase ; sugar assay ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Artefactual results were obtained during assay of sugars in ethanolic extracts of potato tubers with the microplate method. The problem was attributed to contamination with alcohol dehydrogenase of the commercial (yeast) phosphoglucose isomerase used in the assay. The use of phosphoglucose isomerase from another source (rabbit muscle) eliminated the problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358970
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 77
    Electronic Resource
    Electronic Resource
    General combining ability and its repeatability in early generations of potato breeding programmes (1998)
    Springer
    Potato research 41 (1998), S. 21-28 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; general combining ability ; seedling generation ; clonal generations ; genotypexenvironment ; yield ; tuber colour and shape
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary General combining ability and its repeatability in the early generations of a potato breeding programme was studied by evaluating 72 progenies (18×4) of 22 parents in a factorial mating design for three successive generations. The mean squares for combining ability due to females, males and females × males were significant for eight out of the ten characters studied. Variance estimates due to specific combining ability were more important than those due to general combining ability for most of the characters in all the generations. General combining ability effects varied from generation to generation. Most of the correlation coefficients between generations for general combining ability effects were significant, but of moderate magnitude (0.5–0.8). Parents with consistent performance over generations and those specifically suitable for a TPS crop were identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360258
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 78
    Electronic Resource
    Electronic Resource
    Soft-rot resistance combined with other tuber characters in long day-adaptedSolanum phureja (1998)
    Springer
    Potato research 41 (1998), S. 69-82 
    Details
    ISSN: 1871-4528
    Keywords: potato ; diploid ; Erwinia ; yield ; tuber characters ; breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Offspring were produced from a cross between two long-day-adaptedSolanum phureja clones which carried resistance to tuber soft rot (Erwinia carotovora subsp.atroseptica). In tests carried out on the produce of field-grown plants raised from tubers, over fifty per cent of the 173 offspring were found to be highly resistant. Assessments were also carried out of tuber yield, mean tuber weight, tuber number, shape, regularity, flesh colour, texture of the steamed flesh, fry colour, after-cooking blackening, sprout length after storage and overall dormancy. There were statistically significant differences between clones for all characters (P〈0.001). Twelve of the clones were selected on the basis of high resistance, yield, tuber weight, regularity of shape and absence of after-cooking blackening. The value of resistant long-day-adapted diploid material for commercial breeding is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360263
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 79
    Electronic Resource
    Electronic Resource
    Systemic induced resistance to late blight in potato by treatment with salicylic acid andPhytophthora cryptogea (1998)
    Springer
    Potato research 41 (1998), S. 135-142 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; Phytophthora infestans ; inducer agents ; plant protection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Tests for systemic induced resistance (SIR) to late blight were performed with different potato cultivars in field trials and in growth chamber experiments. The non-pathogenPhytophthora cryptogea (Pc) and salicylic acid (Sa) were used as inducer agents. In the field, plants were naturally infected byPhytophthora infestans while the indoor plants were inoculated. The degree of SIR obtained varied with the cultivar used and also with the type of inducer. For example in the field the susceptible cv. St. Cecilia had enhanced resistance with Pc whereas Sa caused increased susceptibility. Inbred resistant cvs acquired increased resistance after treatment with Sa. In a separate pilot experiment in a growth chamber, Sa at two different concentrations was injected into potato seed tubers before planting. The higher Sa concentration increased resistance in genetically resistant cultivars while the lower Sa concentration brought about increased susceptibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358436
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 80
    Electronic Resource
    Electronic Resource
    Optimisation of a dehydration process for potato cubes using an intermediate puffing step (1998)
    Springer
    Potato research 41 (1998), S. 203-209 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; tuber ; blanching ; pre-drying
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Factors affecting the volume expansion of potato cubes during puffing in a fluidised bed were examined. It was found that puffing temperature, initial size, pre-drying time and puffing time influenced the degree of expansion of the cube during the puffing step. Blanching alone was found not to influence expansion, but in conjunction with the other factors it was found that blanched samples showed greater volume expansion than unblanched samples. The optimum conditions for maximum volume expansion were found to be; blanching for 80 s, cube size between 7.5–12.5 mm, pre-drying time of 90 min. at 90°C and a puffing time of 270s at 130°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358190
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 81
    Electronic Resource
    Electronic Resource
    Yield response of potato genotypes to different soil water regimes in contrasting seasons of a subtropical climate (1998)
    Springer
    Potato research 41 (1998), S. 239-254 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; drought tolerance ; irrigation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Potato crops in subtropical climates are often subjected to water stress, resulting in low yields and poor tuber quality. The yield response of potato genotypes to water supply was investigated in six trials, three each in spring and autumn plantings. Trials were conducted under automated rain shelters, using an irrigation boom to impose five soil water regimes. The negative effect of water stress on tuber yield was more detrimental in spring than in autumn, because of higher atmospheric evaporative demand and higher temperatures in spring. An average yield reduction of 68% was recorded for the most severely stressed regime in spring plantings, while the mean reduction for the same treatment in autumn was only 42%. Genotypic differences in yield response to drought were clearly illustrated in spring, but not in autumn. This suggests that the choice of genotypes is only influenced by the availability of water in spring, when more drought tolerant genotypes should be used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358194
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 82
    Electronic Resource
    Electronic Resource
    Correlation between fusaric acid production and virulence of isolates ofFusarium oxysporum that causes potato dry rot in South Africa (1998)
    Springer
    Potato research 41 (1998), S. 289-294 
    Details
    ISSN: 1871-4528
    Keywords: post harvest disease ; potato ; Solanum tuberosum L. ; resistance ; toxin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Virulence of 12Fusarium oxysporum isolates was determined on three potato cultivars Late Harvest, BP1 and Kimberley Choice. The production of fusaric acid by the 12F. oxysporum isolates was also determined. The aim of the study was to determine whether a correlation exists between fusaric acid production and virulence ofF. oxysporum isolates. Late Harvest was the most tolerant and BP1 the most susceptible cultivar. Virulence ranking, order of theF. oxysporum isolates with the different cultivars corresponded with the mean of value of the ranking order for all three cultivars. A correlation was found between virulence of isolates and fusaric acid production except for Late Harvest. Fusaric acid production may play a major role in the development of dry rot in potato tubers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358198
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 83
    Electronic Resource
    Electronic Resource
    Defence reactions in two potato cultivars following infection with two races ofPhytophthora infestans (1998)
    Springer
    Potato research 41 (1998), S. 319-325 
    Details
    ISSN: 1871-4528
    Keywords: potato blight ; hydrolytic enzymes ; chitinases ; glucanases ; phytoalexins ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The kinetics of accumulation of chitinases, glucanases and phytoalexins were studied in two potato cultivars, differing in their degrees of vertical and horizontal resistance, when infected with two races ofPhytophthora infestans. Tuber disks of cvs Kennebec (susceptible, low horizontal resistance) and Huinkul (tolerant, high horizontal resistance) were infected with either race “0” (avirulent) or “C” (complex, race 1.3.5.7.11) ofPhytophthora infestans. Extracts of tuber tissue (0–7 days) from cv. Kennebec infected with race “0” showed a strong increase in phytoalexin production and in chitinase and glucanase activities when compared with those infected with race “C”. These results indicate that race “C” is able to block defensive reactions. No significant differences were observed in cv. Huinkul infected with both races. The contribution of these reactions to horizontal resistance is unknown, and our results would not support a conclusive role for them in the interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358964
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 84
    Electronic Resource
    Electronic Resource
    The effect of seed-and soilborne inoculum ofColletotrichum coccodes on the incidence of black dot on potatoes (1998)
    Springer
    Potato research 41 (1998), S. 51-56 
    Details
    ISSN: 1871-4528
    Keywords: prochloraz ; Solanum tuberosum L. ; soil treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Soil in a potato field naturally infested with black dot (Colletotrichum coccodes) was fumigated with methyl bromide at 126 g m−2 or left unfumigated. Potato seed tubers (cv. BP1) uninfected, lightly infected (1–25% surface affected), severely infected (26–100% surface affected) and severely infected withC. coccodes but dusted with prochloraz manganese chloride as Octave 2.5% DP at 750 g per 100 kg seed were planted in fumigated and unfumigated soil. When harvested, the incidence of black dot on the progeny of infected seed planted in unfumigated soil was twice that of progeny in fumigated soil, with progeny of uninfected seed having a 68.5 times higher disease incidence in unfumigated soil. Black dot on progeny tubers was reduced by pre-treatment of seed with prochloraz in fumigated soil only. With black dot infested fields, planting disease-free seed or treating seed with fungicides would not decrease disease on progeny tubers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360261
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 85
    Electronic Resource
    Electronic Resource
    Effect of inorganic nitrogen nutrition on cytokinin-induced potato microtuber production in vitro (1998)
    Springer
    Potato research 41 (1998), S. 211-217 
    Details
    ISSN: 1871-4528
    Keywords: in vitro tuberization ; micropropagation ; mineral nutrition ; seed potato production ; Solanum tuberosum L. ; tissue culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of inorganic nitrogen nutrition on the induction and development of microtubers by cytokinin-induced tuberization was studied in four potato genotypes belonging to different maturity groups. The objective of this study was to investigate whether a reduction in total nitrogen level in the Murashige & Skoog medium would improve cytokinin-induced tuberization rate. The effect of three levels of total nitrogen (15, 30 and 45 meq) on tuberization was studied at constant (20 meq K) and varying potassium levels approximating to 5, 10 and 15 meq. Reducing the total nitrogen supply increased the number but decreased the size of nitrogen level on the rate of assimilate partitioning (harvest index) during cytokinin-induced microtuberization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358191
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 86
    Electronic Resource
    Electronic Resource
    Changes in race structure of Canadian populations ofPhytophthora infestans based on specific virulence to selected potato clones (1998)
    Springer
    Potato research 41 (1998), S. 355-370 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; host differentials ; R genes ; multilocus genotype ; host-pathogen interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A collection of 80 isolates ofPhytophthora infestans, representing multilocus genotypes of the pathogen found in Canada from 1994 to 1996, was screened on a series of nine differential potato host cultivars to determine the physiological race of the isolates. A total of 28 pathotypes were found among the 11 genotypes present in the collection. There was a significant increase in the complexity of pathotypes from 1994 to 1996 which reflected the displacement of the US-1 genotype (mean of 2.2 host differentials infected) by the US-8 genotype (mean of 8.1 host differentials infected). Eighteen of the US-8 isolates could overcome all nine of the resistance genes tested. Virulence genes which overcame host resistance conferred by R8 were the rarest in the populations studied. The predominance of complex populations ofP. infestans in Canada implies that the introduction of cultivars with specific R genes for resistance would be an ineffective control measure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358968
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 87
    Electronic Resource
    Electronic Resource
    Indications of soil borne inoculum ofPhytophthora infestans (1998)
    Springer
    Potato research 41 (1998), S. 305-310 
    Details
    ISSN: 1871-4528
    Keywords: potato late blight ; mating types ; oospores ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In this paper we present observations made during three years in a potato field in Sweden that indicated the presence of soil borne inoculum ofPhytophthora infestans. In 1994, a fungicide trial against late blight was left in the field with various degrees of late blight infection. In 1995, cereals was grown in the field. In 1996, certified potato seed tubers were planted and blight appeared early in the season in a pattern corresponding to the heavily infected areas in 1994. No volunteer potato plants were found in 1995 or 1996. Both mating types A1 and A2 were isolated in 1996 and 1997 and oospores were found in leaves, stems as well as in stolons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358962
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 88
    Electronic Resource
    Electronic Resource
    NIR determination of potato constituents (1998)
    Springer
    Potato research 41 (1998), S. 327-334 
    Details
    ISSN: 1871-4528
    Keywords: near infrared spectrometry ; modified partial least squares regression ; quality characterisation ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The development of a method of NIR (near infrared) spectrometric analysis to measure the quality determining constituents of potatoes and the accuracy of its performance are presented. The results show that it is possible to obtain quantitative information about different constituents from reflectance measurement of homogenized peeled potatoes. The analytical performance of NIR spectrometry is highly dependent on the cultivar being measured. Consequently, the calibration and validation sample sets will have to be expanded to provide greater utility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358965
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 89
    Electronic Resource
    Electronic Resource
    Potato tubers as a biofactory for recombinant antibodies (1998)
    Springer
    Molecular breeding 4 (1998), S. 313-319 
    Details
    ISSN: 1572-9788
    Keywords: antibody ; endoplasmic reticulum ; phytofarming ; potato ; production ; scFv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Potato tubers have been successfully used for high-level production of a recombinant single-chain Fv (ScFv) antibody. Ubiquitous high-level expression was achieved under control of the CaMV 35S promoter through retention of the scFv protein in the endoplasmic reticulum. Recombinant antibodies accumulated up to 2% of total soluble tuber protein. After 1.5 years of tuber storage at 4 °C still half of the amount of scFv present in freshly harvested tubers was detectable. Its specific activity did not decrease during tuber storage. Recombinant protein could be efficiently purified from crude extracts by affinity chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009676832273
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 90
    Electronic Resource
    Electronic Resource
    Vegetative-compatibility groups in Verticillium dahliae from Israel (1998)
    Springer
    European journal of plant pathology 104 (1998), S. 263-269 
    Details
    ISSN: 1573-8469
    Keywords: cotton ; potato ; vegetative comptability ; Verticillium dahliae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Nitrate-nonutilizing (nit) mutants were used to determine vegetative compatibility among 34 isolates of Verticillium dahliae from cotton, potato, olive, eggplant, chrysanthemum and tomato from 12 sites in Israel. Based on the formation of complementary heterokaryons, 33 isolates were assigned to two vegetative- compatibility groups (VCGs): one VCG contained 15 isolates from cotton, eggplant, chrysanthemum and olive; and the other VCG contained 18 isolates from potato, olive and cotton. The status of an additional isolate from tomato, which was compatible with both VCGs, remained unclear. In a limited pathogenicity test with 10 isolates, two (from tomato and eggplant) were pathogenic on tomato, eggplant and cotton; most isolates from cotton were pathogenic on cotton and eggplant only; and one from cotton was non-pathogenic. Fewer isolates were pathogenic on tomato than on cotton or eggplant. The diversity of vegetative compatibility found in our V. dahliae collection is comparable to that found in studies of American populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008696312859
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 91
    Electronic Resource
    Electronic Resource
    Multivariate analysis of variation among Solanum commersonii (+) S. tuberosum somatic hybrids with different ploidy levels (1998)
    Springer
    Euphytica 99 (1998), S. 35-41 
    Details
    ISSN: 1573-5060
    Keywords: cluster analysis ; discriminant analysis ; ploidy level ; potato ; Solanum commersonii ; somatic hybrids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In order to integrate the outcomes of interspecific somatic fusion experiments in breeding schemes, it is important to understand factors involved in the variability observed among regenerated plants. With such a purpose in mind, a population of Solanum commersonii (+) S. tuberosum somatic hybrids was examined by means of discriminant and cluster analyses. Data were collected on 56 hybrids with different ploidies and on the two diploid parents grown in a greenhouse. The ploidy group was used as discrimination criterion. Three significant canonical variables were extracted by discriminant analysis; they were mainly correlated with the number of leaflets and stems, degree of flowering, plant height, and leaf length. After cluster analysis carried out with the significant canonical variables, parental and hybrid clones were grouped in 7 clusters. In the canonical space of reduced dimensions, patterns of morphological variation depended mainly on ploidy level and non-additive gene interactions. Hybrids were in general more similar to the cultivated than to the wild species, suggesting a good chance of fast introgression of useful traits from S. commersonii into the S. tuberosum genetic background.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018361016968
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 92
    Electronic Resource
    Electronic Resource
    Portable rhizotron and color scanner system for monitoring root development (1998)
    Springer
    Plant and soil 200 (1998), S. 107-112 
    Details
    ISSN: 1573-5036
    Keywords: computer imaging ; portable rhizotron ; potato ; root
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Rhizotrons allow the examination of spatial and temporal in situ root development. Permanent rhizotron installations provide 2-D images of whole root profiles, but their immobility limits the number of soil-plant systems that can be studied. Our objectives were to develop a portable rhizotron and color scanning system for studying the development of whole root systems. Potato root development was monitored in an irrigated experiment at Othello, WA. Covered, rectangular hollow boxes with a transparent glass face were installed perpendicular to planted potato rows, and a seed piece was planted in the soil adjacent to the glass. Rooting in the hill furrow topography was measured at 2 to 4 week intervals. Images of roots growing along the glass face are captured with five scans with a portable, color scanner and a portable computer. Image thresholding discriminated roots from soil using primary color values, color intensity differences, color proportions, or overall intensity. Seasonal patterns of computed root lengths by image analysis were comparable to manual tracing. Primary roots extended to 15 cm from the seed piece prior to shoot emergence, 21 days after planting. Lateral roots began to develop shortly thereafter. Potato roots extended to depths of 60 cm by 4 to 6 weeks after planting, and maximum root density in the hill and furrow was observed by tuber initiation to early tuber bulking. Temporal and spatial trends were similar to previous results using destructive sampling. The method has promise for studying the root growth and development of field-grown plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004277118087
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 93
    Electronic Resource
    Electronic Resource
    Selection of diploid tuberous Solanum hybrids for 2n-egg formation using 2x⋅4x-crosses (1998)
    Springer
    Euphytica 101 (1998), S. 325-339 
    Details
    ISSN: 1573-5060
    Keywords: potato ; sexual polyploidization ; Solanum ; species ; Tuberosum hybrids ; unreduced gametes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Diploid families of Tuberosum hybrids as well as Tuberosum-wild species F1 hybrids were generated to select 2n-egg producing genotypes of different genetic backgrounds. Plants were selected if they produced more than four seeds per berry after pollination with tetraploid males (2x⋅ot4x-crosses). From the nine families of Tuberosum hybrids that were derived from one or two 2n-egg producing parents, 12 out of 82 (15%) 2n-egg producing plants were selected. From the 32 families of Tuberosum-wild species F1 hybrids, 21 of 274 (8%) 2n-egg producing plants were selected. The level of 2n-egg formation was estimated in 25 selected diploid hybrids and five control clones (three high, one moderate and one low 2n-egg producers) on the basis of seed set following 2x⋅4x-crosses using 13 tetraploid males in four crossing years. Besides the effect of the diploid 2n-egg producing female on the seed set following 2x⋅4x-crosses (P = 0.0001), there was a significant effect of the tetraploid male (P = 0.0001), whereas the effect of the crossing year (P = 0.0688) was less significant. On the basis of differences in the seed set following 2x⋅4x-crosses as compared to the control clones for low, moderate and high level of 2n-egg formation, the level of 2n-egg formation in two of the newly selected hybrids was classified as very high, four were high, sixteen were moderate and three were low. The significance of the selected hybrids for the genetic analysis of various restitution mechanisms of 2n-egg formation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018391013013
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 94
    Electronic Resource
    Electronic Resource
    Factors affecting minimal growth conservation of potato microplants in vitro (1998)
    Springer
    Euphytica 102 (1998), S. 275-280 
    Details
    ISSN: 1573-5060
    Keywords: Germplasm conservation ; in vitro conservation ; minimal growth ; slow growth ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Combined effects of sucrose, mannitol and photoperiod on microplant conservation were studied in four potato genotypes belonging to two different groups viz., Tuberosum and Andigena. Minimal growth medium was based on Murashige and Skoog (MS) supplemented with 6 different concentrations of sucrose (30, 40, 50, 60, 70 and 80 gl-1) with 4 different concentrations of mannitol (0, 20, 40 and 60 gl-1). The cultures were conserved under two photoperiod conditions i.e. continuous illumination and 16-h photoperiod at 6 ± 1 °C. There were significant interactions between photoperiod and sucrose, and between photoperiod and mannitol. Maximum microplant survival and desirable microplant growth were observed under 16-h photoperiod. Sucrose alone did not improve culture viability over 30 months of storage. Inclusion of mannitol in the conservation medium increased microplant survival. Sucrose x mannitol interaction showed that sucrose was effective in enhancing microplant survival in combination with 20 or 40 gl-1 mannitol, but not with 60 gl-1 mannitol. Combined effect of sucrose, mannitol and photoperiod showed that optimum microplant growth and maximum culture viability were obtained when the cultures were grown in MS medium containing 40 gl-1 sucrose and 20 gl-1 mannitol under 16-h photoperiod. Potato microplants can be conserved in this medium and cultural conditions up to 30 months without subculturing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018309300121
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 95
    Electronic Resource
    Electronic Resource
    Effect of chlorocholine chloride sprays on the carbohydrate composition and activities of sucrose metabolising enzymes in potato (Solanum tuberosum L.) (1998)
    Springer
    Plant growth regulation 26 (1998), S. 97-103 
    Details
    ISSN: 1573-5087
    Keywords: carbohydrate composition ; chlorocholine chloride ; growth retardant ; potato ; sucrose metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Chlorocholine chloride (CCC) was sprayed on a potato crop 25 days after sowing (DAS) at 5 day intervals for a total of 7 sprays. Activity of sucrose synthase (SS) in the sucrose cleavage direction was many fold higher than that of acid invertase in all the tissues. The activity of alkaline invertase was negligible. A sharp decline in the starch content of stolons of the CCC-sprayed crop was observed between 60 DAS and 70 DAS. This could divert the carbon towards tubers and thus enhancing its availability for starch synthesis. The CCC-treated crop, in general, had higher SS (cleavage) activity in stem, stolons and tubers. A higher sucrose content in the stem of the CCC-treated crop could be due to the high sucrose phosphate synthase (SPS) activity observed in this plant part. In tubers of CCC-treated crops a higher SS (cleavage) activity along with a high sucrose content in tubers during the active tuber filling stage could lead to better availability of UDP-glucose for its conversion to glucose-1-phosphate, which could enter into the amyloplast leading to higher starch content. High SPS activity in tubers of CCC-treated plants ensures that reducing sugars formed are reconverted efficiently to sucrose. The efficiency of developing tubers from CCC-sprayed plants to convert 14C sucrose fed through stolons into starch was about 2.5 times more than in the control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006087729077
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 96
    Electronic Resource
    Electronic Resource
    Partial replacement of dietary casein with soy protein isolate can reduce the severity of retinoid-induced hypertriglyceridemia (1998)
    Springer
    Plant foods for human nutrition 52 (1998), S. 97-108 
    Details
    ISSN: 1573-9104
    Keywords: Hypertriglyceridemia ; Protein ; Rat ; Retinoid ; Soy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Previous research carried out in an animal model of retinoid-induced hypertriglyceridemia – rats fet a 13-cis retinoic acid (13cRA)-containing diet having casein as the protein source – has demonstrated that the complete replacement of dietary casein with soy protein isolate (SPI) can decrease the severity of this condition. In this study, the effect of partially replacing dietary casein with SPI was investigated. Five groups of male Fischer 344 rats were used in a 14-day study, with two groups being fed diets having casein as the protein source, without or with 13cRA (groups A and B, respectively), and three groups being fed 13cRA-containing diets in which SPI was used to bring about the isonitrogenous replacement of 25, 50, or 100% of the casein in the formula for the diet used for group B (groups C-E, respectively). Serum triglyceride concentration for group B was significantly different ( p 〈 0.05) from that of groups A, D, and E (5.41 vs 2.62, 4.04, and 2.66 mmol/l, respectively). Serum cholesterol concentrations for groups D and E were significantly lower ( p 〈 0.05) than for groups A and B (1.63 and 1.60 vs 2.00 and 2.14 mmol/l, respectively). Thus, the isonitrogenous replacement of 50% of dietary casein with SPI can reduce the severity of retinoid-induced hypertriglyceridemia while decreasing the serum concentration of cholesterol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008092906465
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 97
    Electronic Resource
    Electronic Resource
    Fortieth volume of Potato Research: a selective history (1997)
    Springer
    Potato research 40 (1997), S. 1-4 
    Details
    ISSN: 1871-4528
    Keywords: scientific journal ; professional organization ; agronomy ; crop science ; research ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Potato Research started as the “European Potato Journal”, the official journal of the European Association for Potato Research, in 1958, was re-named “Potato Research” in 1970 (Volume 13) and has published mainly original scientific contributions in 39 volumes. The authorship has become increasingly international and currently writes predominantly in English, although papers are also offered in German or French. Topics covered have seen clear changes over volumes, mainly reflecting trends and break-throughs in (potato) science.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407557
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 98
    Electronic Resource
    Electronic Resource
    Stomatal resistance of three potato cultivars as influenced by soil water status, humidity and irradiance (1997)
    Springer
    Potato research 40 (1997), S. 47-57 
    Details
    ISSN: 1871-4528
    Keywords: minimum stomatal resistance ; soil water ; Solanum tuberosum L. ; photosynthetic photon flux density ; vapour pressure deficit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Leaf stomatal resistance varies considerably in response to changes in environmental conditions. Understanding cultivar differences in the response of stomata to these conditions is important for effectively simulating water-use and growth. In this study the stomatal resistance of three field grown potato (Solanum tuberosum L.) cultivars Atlantic. Monona and Norchip was observed in response to photosynthetic photon flux density, leaf to air vapour pressure difference and root zone available soil water. Substantial variation in stomatal resistance was accounted for by functions of the environmental variables for both Monona and Norchip. The explained variation for Atlantic was considerably less. Light saturation occurred near 500 μmol m−2 s−1. Increasing stomatal resistance above 1000 μmol m−2s−1 was also observed but is likely an artifact of stomatal closure on days in which mid-day leaf water potentials dropped below critical levels. Although the leaf presumably insufficient to obtain substantial effects. The soil water status was partially linked to the average 1000 h to 1500 h stomatal resistance on clear, sunny days. Significant differences were observed among the cultivars in the response of stomata to changes in the available soil water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407561
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 99
    Electronic Resource
    Electronic Resource
    The effect of condensation on sporulation ofHelminthosporium solani on potato tubers infected with silver scurf and held in simulated store conditions (1997)
    Springer
    Potato research 40 (1997), S. 169-180 
    Details
    ISSN: 1871-4528
    Keywords: skin resistance ; temperature ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Chambers were designed to simulate environmental conditions present in commercial potato stores and were used to introduce condensation to tubers infected with silver scurf (Helminthosporium solani). The electrical resistance measured across the skin of tubers from the top of the chambers was consistently lower than that from the bottom of the chamber, and this was reflected in an increased number ofH. solani spores produced by the top tubers. An increase in the length of the condensation period resulted in the skin resistance remaining lower for a longer period and also resulted in higher number of spores. Tubers held at relatively high ambient temperatures (15 °C) required a shorter period of condensation to cause an increase in spore count. This investigation highlighted the need for close monitoring of store environments so that condensation events can be quickly identified and the tubers dried.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358243
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 100
    Electronic Resource
    Electronic Resource
    Treatment of seed potatoes with prochloraz for simultaneous control of silver scurf and black dot on progeny tubers (1997)
    Springer
    Potato research 40 (1997), S. 221-227 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; Helminthosporium solani ; Colletotrichum coccodes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Potato seed tubers infected withHelminthosporium solani andColletotrichum coccodes were treated with prochloraz (as Omega 450 g a.i. l−1 EC) and/or prochloraz managanese chloride (as Octave 25 g/kg DP), and planted in two separate fields not previously cultivated with potatoes. Dipping seed 28 d prior to planting in 2,4 or 6 g a.i. l−1 Omega, and dusting with 500 or 750 g Octave per 100 kg seed significantly reduced the incidence of silver scurf and black dot on progeny tubers. In one field, the higher concentrations of Omega and Octave gave slightly better control than the lower Omega concentrations. At the second site, postharvest application of 4 g a.i. l−1 Omega or 750 g Octave per 100 kg seed limited development of both diseases on progeny tubers, with slightly better control when an additional Octave dusting was applied 14 d before planting. None of the prochloraz treatments adversely affected plant stand or tuber yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358247
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...