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  • Wheat  (20)
  • Springer  (20)
  • American Chemical Society
  • PANGAEA
  • 2005-2009
  • 1980-1984  (20)
  • 1980  (20)
Collection
Keywords
Publisher
  • Springer  (20)
  • American Chemical Society
  • PANGAEA
Years
  • 2005-2009
  • 1980-1984  (20)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Rye chromosome translocations in hexaploid wheat: a re-evaluation of the loss of heterochromatin from rye chromosomes (1980)
    Springer
    Theoretical and applied genetics 56 (1980), S. 17-23 
    Details
    ISSN: 1432-2242
    Keywords: Wheat ; Rye ; Triticale ; Highly repeated ; DNA sequences ; Heterochromatin ; Translocations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Using in situ hybridization techniques, we have been able to identify the translocated chromosomes resulting from whole arm interchanges between homoeologous chromosomes of wheat and rye. This was possible because radioactive probes are available which recognize specific sites of highly repeated sequence DNA in either rye or wheat chromosomes. The translocated chromosomes analysed in detail were found in plants from a breeding programme designed to substitute chromosome 2R of rye into commercial wheat cultivars. The distribution of rye highly repeated DNA sequences showed modified chromosomes in which (a) most of the telomeric heterochromatin of the short arm and (b) all of the telomeric heterochromatin of the long arm, had disappeared. Subsequent analyses of these chromosomes assaying for wheat highly repeated DNA sequences showed that in type (a), the entire short arm of 2R had been replaced by the short arm of wheat chromosome 2B and in (b), the long arm of 2R had been replaced by the long arm of 2B. The use of these probes has also allowed us to show that rye heterochromatin has little effect on the pairing of the translocated wheat arm to its wheat homologue during meiosis. We have also characterized the chromosomes resulting from a 1B-1R translocation event. From these results, we suggest that the observed loss of telomeric heterochromatin from rye chromosomes in wheat is commonly due to wheat-rye chromosome translocations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264422
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  • 2
    Electronic Resource
    Electronic Resource
    Glutenin subunits of genetically related European hexaploid wheat cultivars: Their relation to bread-making quality (1980)
    Springer
    Theoretical and applied genetics 58 (1980), S. 107-111 
    Details
    ISSN: 1432-2242
    Keywords: Glutenin ; Wheat ; Bread-making ; Chromosomal control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The subunit composition of glutenin from 47 European wheat cultivars was studied using SDS-polyacrylamide gel electrophoresis. These cultivars are genetically related since they originate from the same stock. Moreover, the diversity of sample, containing cultivars with very different French bread-making qualities, makes it possible to investigate the relationship between glutenin subunit composition and bread-making quality. 16 electrophoretic types of glutenin subunits could be distinguished: these were grouped into four classes. Depending on the cultivar, six to eight glutenin subunits with MW more than or equal to 62,000 were detected. Subunits 3 and 5, with an approximate MW of 122,000 and 108,000 respectively, seem to play a prominent role on bread-making quality; they were found in cultivars of good quality and were absent in those unsuitable for making French bread. Two other subunits (9 and 10; MW: 71,000 and 66,000, respectively) have a less defined influence but may be needed in some types of glutenin structure. Aneuploid analysis shows that in ‘Chinese Spring’, subunit 5 is coded by a gene on the long arm of chromosome 1B. The location of genes coding for subunits 3, 9 and 10 could not be determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263099
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  • 3
    Electronic Resource
    Electronic Resource
    Aneuploid analysis of low molecular weight gliadins from wheat (1980)
    Springer
    Theoretical and applied genetics 56 (1980), S. 65-69 
    Details
    ISSN: 1432-2242
    Keywords: Wheat ; Gliadins ; Chromosomal control ; Aneuploid analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The chromosomal location of genes affecting five components from the low molecular weight gliadin (LMWG) fraction from wheat endosperm has been investigated by aneuploid analysis. Genes controlling these proteins were assigned to chromosomes 4B, 7A and 7D. Chromosomes from homoeologous groups 1, 2 and 6, where genes controlling classical gliadins are located, are not involved in the control of LMWG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264427
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  • 4
    Electronic Resource
    Electronic Resource
    Genotypic effects of the maternal tissues of wheat on its grain weight (1980)
    Springer
    Theoretical and applied genetics 58 (1980), S. 247-252 
    Details
    ISSN: 1432-2242
    Keywords: Maternal tissues ; Grain weight ; Wheat ; Triticum aestivum ; Caryopsis ; Pericarp ; Endosperm ; Embryo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Reciprocal crosses were made between semi dwarf spring wheat cultivars (Triticum aestivum L.) differing in grain weight. The weights of the F1 grains (on maternal spikes), from intact as well as from defoliated plants, and those of the F2 grains (on f1 spikes), were examined. Grain weight was controlled primarily by the genotype of the maternal tissues (pericarp, testa or other floret or spikelet organs, including the vascular system), with complete dominance of heaviness. No indications suggesting maternal inheritance were obtained. The frequency distribution of the weights of the F2 grains indicated the presence of genotypic effects exerted by the endosperm or embryo. The embryo or endosperm factors for heaviness also seemed to be dominant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265174
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  • 5
    Electronic Resource
    Electronic Resource
    The development of waterlogging damage in wheat seedlings (Triticum aestivum L.) (1980)
    Springer
    Plant and soil 54 (1980), S. 77-94 
    Details
    ISSN: 1573-5036
    Keywords: Nutrients ; Oxygen ; Roots ; Soil ; Toxins ; Waterlogging ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effects of waterlogging on concentrations of gases and various solutes dissolved in the soil water were investigated in the laboratory, to determine whether the early disruption to the growth of wheat was most closely associated with depletion of dissolved oxygen, accumulation of toxins, or changes in concentrations of nutrient ions in the soil water. Waterlogging slowed shoot fresh weight accumulation, leaf extension and nodal root growth; it also caused death of the seminal root system and early senescence of the lower leaves. However, the shoot dry weight initially increased above that of the non-waterlogged controls, and thus was not a reliable indicator of the early restriction to plant growth and development. The symptoms of damage to shoots and roots were attributed to the fall in soil oxygen concentrations, rather than to any decrease in concentration of inorganic nutrients in the soil water, or to the accumulation of any other measured solutes to toxic concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182001
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  • 6
    Electronic Resource
    Electronic Resource
    Free proline accumulation in cereals in relation to salt tolerance (1980)
    Springer
    Plant and soil 57 (1980), S. 167-175 
    Details
    ISSN: 1573-5036
    Keywords: Accumulation ; Barley ; Cations ; Electrical conductivity ; K/Na ratio ; Proline ; Saline water ; Stress ; Tolerance ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In a micro-plot experiment it was observed that free proline accumulation in barley and wheat crops increased with the salt stress. But in sensitive strains of both the crops it did not accumulate in accordance with the preceding values after their tolerance limit and at this point yield of barley was reduced by 25.8% and wheat by 23.2% over control while significant yield reductions were not observed with tolerant strains. Proline accumulation was also found to be related to tissue K/Na ratio and the critical limits of this ratio were observed between 0.60 and 0.34 for barley and 4.2 and 1.4 for wheat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02211676
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  • 7
    Electronic Resource
    Electronic Resource
    Aluminium effects on growth and Al, Ca, Mg, K and P levels in triticale, wheat and rye (1980)
    Springer
    Plant and soil 57 (1980), S. 467-470 
    Details
    ISSN: 1573-5036
    Keywords: Aluminum concentration ; Aluminum toxicity ; Calcium ; Magnesium ; Nutrient solution ; Phosphorus ; Potassium ; Triticale ; Rye ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effects of A1 on the growth and mineral composition of different cultivars of triticale (X Triticosecale, Wittmack), wheat (Triticum aestivum L.) and rye (Secale cereale L.) growing in 1/5 strength Steinberg solutions containing 0 or 6 ppm A1 were evaluated after 32 days. Aluminum increased the concentrations of P and K in the roots and K in the tops of most of the cultivars tested. A1 tolerant triticale retained a lower concentration of Mg in the roots and tops than the A1 sensitive triticale, when subjected to A1 stress. In addition, A1 treatments resulted in smaller increases in root P for the A1 tolerant triticale than for the A1 sensitive cultivars. The concentration of root Ca and P of the A1 tolerant wheat cultivars were significantly below that of the more sensitive plants. Aluminum tolerance in rye appeared to be associated with lower Ca and higher Mg concentrations in the tops. The accumulation of P and A1 in the roots was characteristic of sensitivity in triticale, wheat and rye.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02211704
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  • 8
    Electronic Resource
    Electronic Resource
    An evaluation of seed and seedling drought tolerance screening tests in wheat (1980)
    Springer
    Euphytica 29 (1980), S. 727-736 
    Details
    ISSN: 1573-5060
    Keywords: Wheat ; Triticum aestivum ; bread wheat ; Triticum durum ; durum wheat ; drought tolerance ; germination ; seedling growth ; water stress selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A series of experiments was performed in order to evaluate the significance of seed germination and seedling growth in osmotic media as screening methods for drought tolerance. Ten spring wheat (Triticum aestivum L. em Thell.) and one durum wheat (Triticum durum Desf.) were tested under controlled environments, using polyethylene glycol-6000 (PEG) solutions as the moisture stress inducing media. Tolerance in the rate of endosperm utilization, under stress, prior to the onset of germination varied among cultivars. Germination rate or injury to germination at various concentrations of PEG differed significantly among cultivars. Cultivar rating with respect to injury to germination changed with stress levels. Injury to germination did not correlate with endosperm utilization rate in PEG or in water. Germinating seedlings were tolerant to extreme desiccation up to the stage of emergence of the first leaf from the coleoptile. Growth of photosynthesizing seedlings was monitored as they were carried through an increasing concentration gradient of PEG solutions, ranging from −5.9 to −11.3 bars of water potential. Cultivars significantly differed in seedling growth tolerance to increasing levels of water stress. Seedling growth tolerance across cultivars was not correlated with their germination responses under srress. It is concluded that tolerance to water stress in growing seedlings can be screened for by using PEG-containing nutrient solutions. It can not be predicted from germination tests in osmotica. Work was done under a US-Israel Binational Science Foundation (BSF) Grant no. 1654/78.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023219
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  • 9
    Electronic Resource
    Electronic Resource
    Assimilation of uranium by wheat and tomato plants (1980)
    Springer
    Plant and soil 55 (1980), S. 55-59 
    Details
    ISSN: 1573-5036
    Keywords: Assimilation ; Deficiency ; Irrigation ; Soil ; Tomato ; Toxicity ; Uranium concentration ; Wheat ; Yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Greenhouse conditions have been used for the study of uptake of uranium by wheat and tomato plants as affected by its concentration in soil and irrigation applied. The highest yield of wheat was obtained at 3.0 ppm of uranium whereas the tomato yield decreased with the increase of uranium in the soil. The analysis shows that Uranium uptake by wheat and tomato not only depends upon the uranium concentration in the soil but also on the amount of irrigation applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02149708
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  • 10
    Electronic Resource
    Electronic Resource
    Assessment of a rapid method, using soil cores, for estimating the amount and distribution of crop roots in the field (1980)
    Springer
    Plant and soil 55 (1980), S. 297-305 
    Details
    ISSN: 1573-5036
    Keywords: Barley ; Cereals ; Root distribution ; Root growth ; Soil ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A study was made of the relationship between the number of roots (Nr) observed on unit area of the freshly exposed, horizontal faces of soil cores, and the amounts of roots (per unit volume) present in the same cores. Soil cores, 7 cm diameter, were extracted to depths of 1 m from cereal crops in 1976 at three field sites located on clay soils. Sampling was either at the start of stem elongation, or at anthesis. Estimates of root length per unit soil volume (L) were derived from Nr by assuming random orientation of roots in the soil. Values of L were found to be highly correlated with the measured lengths of both the main roots (root axes) and the total roots (axes and laterals) washed from the soil at a given growth stage, for each of the soils. On average, L was 3.3 times the length of root axes washed from the soil, and was 0.42 times the length of total roots, but there was appreciable variation between different growth stages and field sites. Possible factors giving rise to differences between L and the measured lengths of roots are discussed. Estimates of root length from observation of soil cores may nonetheless provide a suitable basis for rapidly comparing therelative distribution of roots down the soil profile under field conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181809
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  • 11
    Electronic Resource
    Electronic Resource
    pH optima for crop growth (1980)
    Springer
    Plant and soil 54 (1980), S. 339-357 
    Details
    ISSN: 1573-5036
    Keywords: Calcium ; Cassava ; Chemical composition ; Control of solution pH ; Copper ; Flowing solution culture ; French bean ; Ginger ; Hydrogen ion injury ; Magnesium ; Maize ; Manganese ; Nitrogen ; Optimum pH range ; pH ; Plant growth ; Root weight ratio ; Tomato ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Ginger, cassava, maize, wheat, french bean and tomato were grown for periods up to six weeks in continuously flowing nutrient solutions at seven constant pH values ranging from 3.3 to 8.5. All species achieved maximum or near-maximum growth in the pH range 5.5 to 6.5. However, there were substantial differences in the ability of species to grow outside this range. Ginger and cassava were the most tolerant species to low solution pH, while ginger and tomato were the only species to show no yield depression at the highest solution pH. Roots of all species at pH 3.3 and some species at pH 4.0 exhibited symptoms of hydrogen ion injury. In addition, the concentrations of magnesium in the tops of all six species, of nitrogen in the tops of tomato and cassava, and of manganese in the tops of maize at these pH values were inadequate for optimal growth. Growth depression at high solution pH was associated with iron deficiency in maize and wheat and with nitrogen and/or copper deficiency in cassava. The relevance of the present results to crop growth under field conditions is discussed. The complex interplay of plant and soil characteristics militates against precise definition of an optimum pH range for the growth of a particular crop unless the soil is also specified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181830
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  • 12
    Electronic Resource
    Electronic Resource
    Effect of concentration of boron on the uptake and yield of tomato and wheat at different levels of irrigation (1980)
    Springer
    Plant and soil 54 (1980), S. 479-484 
    Details
    ISSN: 1573-5036
    Keywords: Boron concentration ; Boron deficiency ; Greenhouse ; Irrigation ; Tomato ; Uptake ; Wheat ; Yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A study was conducted under greenhouse conditions to know the effects of irrigation levels on the uptake of B by wheat and tomato at different levels of B concentrations. The uptake was found to increase with increase in concentrations as well as with increase in amount of water applied. The highest yield of tomato was obtained at 1.5 ppm of B, whereas that of wheat was obtained at 3 ppm of B at the highest level of irrigation. The boron uptake by tomato and wheat is a function of both boron concentration in the soil and the amount of irrigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181840
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  • 13
    Electronic Resource
    Electronic Resource
    On the concentration of acetic acid in straw and soil (1980)
    Springer
    Plant and soil 56 (1980), S. 93-98 
    Details
    ISSN: 1573-5036
    Keywords: Acetic acid ; Barley ; Diffusion ; Silt loam ; Straw ; Water absorption ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Freshly harvested wheat straw contained 0.096 g water g−1 dry straw and 180 mM acetic acid. The straw absorbed water more rapidly from wet soil. The concentration of acetic acid fell to about 10 mM within 6 h of incorporation of straw in the soil and then remained relatively constant for a period of 12 days, irrespective of soil moisture content. In soil at its maximum water holding capacity after gravitational drainage, the decline in acetic acid concentration (c) with distance (d) from wheat or barley straw was exponential, with c=co e−nd where co is the concentration of acetic acid at the straw surface and n is a constant (0.46 for barley and 0.42 for wheat straw). The presence of acetic acid seems to be a major cause of poor establishment and growth when seeds and seedling roots come into contact with straw.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02197956
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  • 14
    Electronic Resource
    Electronic Resource
    Root exudates of plants (1980)
    Springer
    Plant and soil 57 (1980), S. 69-83 
    Details
    ISSN: 1573-5036
    Keywords: Bacteria ; Concentration gradient ; Exudates ; Pseudomonas putida ; Root exudation ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The release of substances from wheat roots was found to be directly related to the growth of the root system. Plants whose root system did not grow released almost no exudates. When exudate concentration in the vicinity of the roots was lowered by frequent replacements of the nutrient solution or by a simultaneous cultivation of exudate-utilizing bacteria, the release of exudates was enhanced. In axenic wheat cultures, the amount of exudates during a 12-day cultivation with 2- or 4-day intervals between medium replacements represented 50% of root dry weight and 12% of whole plant dry weight. Wheat plants cultivated in the presence of the bacteriumPseudomonas putida released up to double the amount of exudates compared with axenic variants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02139643
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  • 15
    Electronic Resource
    Electronic Resource
    Effect of soil temperature alteration by soil covers on seedling emergence of wheat (Triticum aestivum L.) sown on two dates (1980)
    Springer
    Plant and soil 57 (1980), S. 125-129 
    Details
    ISSN: 1573-5036
    Keywords: Mulch ; Polyethylene sheet ; Seedling emergence ; Soil temperature ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A field study was conducted to evaluate the effect of soil temperature altered by various ways of soil coveringviz control (T1), transparent polyethylene (T2), black polyethylene (T3), rice straw (T4), rice straw applied only during night (T5) and farm yard manure (T6) on seedling emergence of wheat sown on November 30, 1978 and January 6, 1979. Maximum increase in soil temperature occurred under transparent polyethylene cover. Temperature alterations were relatively smaller under other treatments and was minimum under farm yard manure cover. With both sowings, the effect of various ways of soil covering on seedling emergence depended on the magnitude of soil temperature alteration caused by them. It was hastened markedly under transparent polyethylene cover and only slightly under black polyethylene cover. Continuous soil covering with rice straw slowed down seedling emergence while covering only during night hastened it slightly. Farm yard manure cover showed negligible effect on seedling emergence. Seedling emergence response to an increase in soil temperature was higher with second sowing when temperature was relatively lower than with first sowing. The result suggests the possibility of expediting seedling emergence of wheat sown under low temperature condition by transparent polyethylene cover. Seedling emergence was only slightly influenced by other soil covers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02139648
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  • 16
    Electronic Resource
    Electronic Resource
    Wheat root distribution in sodic soils (1980)
    Springer
    Plant and soil 57 (1980), S. 487-490 
    Details
    ISSN: 1573-5036
    Keywords: Exchangeable sodium percentage ; Restricted root growth ; Sodic ; Soil ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Greenhouse experiment conducted on Ghabdan loam (a Salic Natraqualf), varying in ESP distribution of soil profile showed that wheat roots could develop having an ESP of 45. Above an ESP of 51 absolutely no root growth was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02211708
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  • 17
    Electronic Resource
    Electronic Resource
    Studies on biological decomposition of wheat straw (1980)
    Springer
    Plant and soil 55 (1980), S. 235-242 
    Details
    ISSN: 1573-5036
    Keywords: Decomposition ; Groundnut ; Soil properties ; Wheat ; Wheat straw ; Yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The incorporation of undecomposed wheat straw in the soil along-with the micro-organisms favourably increased the yield of groundnut crop. An increase of 37 per cent in yield was recorded when wheat straw was inoculated withPenicillium digitatum and the C:P ratio was adjusted to 65. Inoculated treatments of narrower C:P ratio gave a higher yield than wider C:P ratio treatments inoculated with the same cultures. An increase in nitrogen uptake by groundnut plants was recorded due to incorporation of straw alongwith the micro-organisms in soil. The organic carbon and nitrogen content of the soil increased with all the treatments except control. The highest increase in organic carbon and nitrogen of the soil was observed with a treatment of wheat straw of 65 C:P ratio inoculated withS. coccosporum. The yield of wheat crop after groundnut was significantly more with several treatments than control plots. The highest increase of 79 per cent in grain yield of wheat was observed in the plots previouslq received with wheat straw of 200 C:P ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181803
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  • 18
    Electronic Resource
    Electronic Resource
    Growth and development of root systems of winter cereals grown after different tillage methods including direct drilling (1980)
    Springer
    Plant and soil 55 (1980), S. 283-295 
    Details
    ISSN: 1573-5036
    Keywords: Clay soils ; Cultivations ; Direct drilling ; Earthworms ; Root growth ; Root sampling ; Soil water content ; Soil structure ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A method is described for rapidly estimating the depth of penetration and density of roots of cereal crops under field conditions. Counts of living roots, traversing horizontal faces of soil cores, were made for winter wheat growing on direct-drilled and ploughed land. The rate of penetration of roots of winter wheat in a clay and a sandy loam soil averaged 5 mm per day throughout winters without extremes of cold or wet. Death of roots near the soil surface occurred wilst others continued downward penetration. The rate of root elongation was slower during prolonged periods when the soil was wet and faster,i.e. to greater depths, during dry conditions. Damage sustained to roots during adverse winter conditions ofter varied between direct drilling and ploughing. More roots at depth were consistently recorded on direct-drilled than on ploughed land when measured in spring after a soil water deficit had developed during the preceding month. After prolonged wet soil conditions during the winter on a soil with a large clay fraction and low hydraulic conductivity, root growth and penetration in spring, before the development of a soil water deficit, was more restricted on direct-drilled than on ploughed land.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181808
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  • 19
    Electronic Resource
    Electronic Resource
    The occrrence of vesicular-arbuscular mycorrhiza in barley and wheat grown in some Danish soils with different fertilizer treatments (1980)
    Springer
    Plant and soil 55 (1980), S. 403-414 
    Details
    ISSN: 1573-5036
    Keywords: Infection intensity ; Loamy soil ; N fertilizer ; P fertilizer ; Sandy soil ; VA-mycorrhiza ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Soil samples, roots and shoots were collected from barley crops at three locations which had received different combinations of N and P for 10 years, and from long-term fertilizer experiments on barley in a sandy soil and on barley and wheat in a loamy soil. Soils were analysed for available P by an anion exchange resin procedure, roots were examined for intensity of VAM infection, and shoots wee analysed for N and P. Vesicualr-arbuscular mycorrhizal infection was found at all locations. It was most abundant at the three locations with least soil-P and lightest at the two locations high in soil-P. Within loocations an inverse relation was found between soil-P level and intensity of infection. Infection was also intensity. by increasing N-fertilizer. Spore counts from selected samples correlated well with infection intensity. Shoot-P did not differ significantly between treatments in spite of significant differences in soil-P. This points to the significance of vesicular-arbuscular mycorrhiza: a lower soil-P level accompanied by a higher infection intensity seem to counterbalance each other to a certain extent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182701
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  • 20
    Electronic Resource
    Electronic Resource
    Purification of lumicolchicine for use in studies of plant development (1980)
    Springer
    Protoplasma 103 (1980), S. 105-114 
    Details
    ISSN: 1615-6102
    Keywords: Colchicine ; Lumicolchicine ; Microtubules ; Mitosis ; Wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Lumicolchicine was purified by preparative thin-layer chromatography. Tests for purity were ultraviolet absorption spectrophotometry, analytical thin-layer chromatography, and a bioassay using wheat roots. Wheat roots treated for 3 days with 10−3 M lumicolchicine showed no c-mitosis, but had reduced growth compared with controls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276669
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