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  • Articles  (21)
  • resistance  (21)
  • 1985-1989  (21)
  • 1950-1954
  • 1989  (21)
  • 1950
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (21)
Collection
  • Articles  (21)
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Keywords
Publisher
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  • 1985-1989  (21)
  • 1950-1954
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Transmission of potato leafroll virus to or from tuber slices by aphids feeding through a membrane (1989)
    Springer
    Potato research 32 (1989), S. 397-404 
    Details
    ISSN: 1871-4528
    Keywords: resistance ; inoculation of tuber slices ; infection of plants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Eye-bearing slices, cut from healthy potato tubers and placed between Parafilm membranes, were inoculated with potato leafroll virus (PLRV) byMyzus persicae. PLRV was detected by ELISA and by transmission tests in tuber slices and in plants grown from the slices of the susceptible cv. Désirée, but not in those of the resistant cv. Arkula. These results suggest that PLRV replication and transport within tuber phloem is controlled by specific mechanisms of resistance.M. persicae was also able to acquire and transmit PLRV toPl floridana from slices cut from tubers of infected plants. The aphids effectively transmitted PLRV from slices cut from the sprouting rose end but they failed to transmit it from slices cut from the heel end of tubers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357853
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  • 2
    Electronic Resource
    Electronic Resource
    Non-uniform soil water extaction by plant roots (1989)
    Springer
    Plant and soil 113 (1989), S. 121-124 
    Details
    ISSN: 1573-5036
    Keywords: CAT scanning ; drawdown ; plant roots ; resistance ; water uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Using the technique of Computer Assisted Tomography applied to gamma ray attenuation measurement of soil water content, it has been shown that the assumption of uniform absorption of soil water along a plant root is clearly erroneous and that drawdown distance is a function of time. The results suggest that the plant sequentially removes water from the top to the bottom of the root as soil hydraulic resistance becomes a major limiting factor in the upper layers, even at the high soil water potential (−0.30 MPa) used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181929
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  • 3
    Electronic Resource
    Electronic Resource
    Reactions on Nicotiana species to potato viruses A, X and Y and tobacco mosaic virus in relation to their taxonomy and geographical origin (1989)
    Springer
    European journal of plant pathology 95 (1989), S. 343-356 
    Details
    ISSN: 1573-8469
    Keywords: centre of virus origin ; hypersensitivity-associated resistance ; immunity ; resistance ; resistance sources ; sensitivity ; test plants ; tolerance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Samenvatting Na inoculatie van een grote collectieNicotiana-soorten met 14 isolaten van de aardappelvirussen A (PVA), X (PVX) en Y (PVY) en tabaksmozaïekvirus (TMV), konden de secties of sectiedelen van het genus op basis van de gemiddelde reactie van hun soorten in vijf groepen worden verdeeld. Soorten uit Australische woestijngebieden en taxonomisch behorend tot de sectieSuaveolentes (subgenusPetunioides) bleken het meest gevoelig en het minst resistent, terwijl de sectiesPaniculatae (subgenusRustica),Tomentosae (Tabacum) enNoctiflorae (Petunioides) het minst gevoelig en het meest resistent waren. Van de collectienummers van de laatstgenoemde secties bleek 61% resistentie tegen minstens twee van de virussen te bezitten. De meest resistente soorten hebben hun verspreidingsgebied vooral in het centrale deel van het Andesgebergte (het zuidelijk deel van Peru, Bolivia en noord-westelijk Argentinië). Mogelijk is dit het ontstaansgebied van deze virussen. De einge andere resistente soort wasN. africana (Suaveolentes) uit zuid-westelijk Afrika. De meest gevoelige Amerikaanse secties, te wetenGenuinae (Tabacum) enTrigonophyllae, Alatae, Acuminatae enBigelovianae (Petunioides), waren gemiddeld gevoeliger danSuaveolentes-soorten die niet uit de Australische woestijnen afkomstig zijn. Het resterende deel van het genus, bestaande uit de Amerikaanse sectiesThyrsiflorae enRusticae (Rustica) enUndulatae, Repandae enNudicaules (Petunioides), stond met betrekking tot gevoeligheid en resistentie tussen laatstgenoemd deel van de sectieSuaveolentes en de groep resistente secties in, maar vertoonde in hoge mate tolerantie voor PVA, PVX en PVY en met overgevoeligheid samengaande resistentie voor TMV. Uit de resultaten blijkt dat de reacties van het genusNicotiana op virussen vooral geografisch bepaald zijn en in mindere mate taxonomisch.
    Notes: Abstract When testing the response of species of the genusNicotiana to 14 isolates of potato viruses A (PVA), X (PVX) and Y (PVY) and tobacco mosaic virus (TMV), sections and section parts of the genus could be divided into five groups according to the overall reaction of their species. Species from arid regions of australia and belonging to the sectionSuaveolentes (subgenusPetunioides) were most sensitive and least resistant, whereas the sectionsPaniculatae (subgenusRustica),Tomentosae (Tabacum) andNoctiflorae (Petunioides) appeared least sensitive and most resistant. Sixty-one percent of the accessions of the latter sections proved resistant to at least two of the viruses. The most resistant species have their main geographical distribution in the central Andes (southern Peru, Bolivia and north-western Argentina), where the viruses may have originated. One other resistant species wasN. africana (Suaveolentes) indigenous to south-western Africa. The most sensitive American sections, viz.Genuinae (Tabacum) andTrigonophyllae, Alatae, Acuminatae andBigelovianae (Petunioides), were generally more sensitive than species of theSuaveolentes section from outside the arid regions of Australia. The remaining part of the genus, viz. the American sectionsThyrsiflorae andRusticae (Rustica) andUndulatae, Repandea andNudicaules (Petunioides) was intermediate between the latter group ofSuaveolentes species and the resistant group of sections with regard to sensitivity and resistance, but had a high rate of tolerance to PVA, PVX and PVY and of hypersensitivity-associated resistance to TMV. The results indicate that the viral respons in the genusNicotiana is mainly determined geographically and to a lesser extent taxonomically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01976621
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  • 4
    Electronic Resource
    Electronic Resource
    A greenhouse screening method forPyrenochaeta lycopersici resistance in tomatoes (1989)
    Springer
    Euphytica 40 (1989), S. 187-191 
    Details
    ISSN: 1573-5060
    Keywords: Lycopersicon esculentum ; tomato ; Pyrenochaeta lycopersici ; corky root ; brown root rot ; resistance ; greenhouse screening method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A greenhouse screening method for corky root (Pyrenochaeta lycopersici) resistance in the tomato (Lycopersicon esculentum) is described in detail. In determining the reliability of the method, known resistance sources within wild asccessions, commerical cultivars and breeding lines were evaluated for resistance in fields naturally infested with corky root and their response compared under greenhouse conditions in soil heavily infested with corky root and artifically maintained at temperatures between 10–13°C. The procedure developed can be used year round and improves the efficiency of recovering resistant progeny in large segregrating populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024510
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  • 5
    Electronic Resource
    Electronic Resource
    Evaluation of the virulence of races 1, 2 and 4 of Fusarium oxysporum f.sp. dianthi in carnation (1989)
    Springer
    Euphytica 42 (1989), S. 55-63 
    Details
    ISSN: 1573-5060
    Keywords: Dianthus caryophyllus ; carnation ; cultivar ; races ; Fusarium wilt ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A simultaneous analysis of the virulence of races 1, 2 and 4 of Fusarium oxysporum f.sp. dianthi to a series of nine carnation cultivars revealed the presence of different interactions between races and cultivars, as well as differences in pathogenesis between race 1 on the one hand and race 2 and 4 on the other. The most common race 2 induced typical symptoms of Fusarium wilt in all susceptible cultivars. The cultivars showed considerable variation in resistance to race 2. Only Novada remained free of external symptoms throughout the experiment. In diseased plants of all cultivars studied, infected vascular tissue was white with dark brown margins, and heavy degradation of the cell walls and xylem parenchyma cells had occurred. All Dutch isolates corresponded with race 2. Race 4 induced wilt symptoms similar to those induced by race 2, and there was a similar variation in resistance to race 2 and 4 in the cultivars. On average, the race 4 isolates were less aggressive than those of race 2. Compared with race 2, there was evidence of some genotype × race interactions: Pallas proved to be considerably more susceptible, and Lena more resistant to race 4 than to race 2. The isolates of race 4 induced a nistopathology similar to that induced by race 2, but with less vascular browning. Race 1 induced atypical but severe wilt symptoms and unusual vascular discoloration in Elsy, Niky and Sam's Pride only. The vascular tissue in these cultivars turned pale brown; in spite of heavy colonization of these tissues virtually no degradation of cell walls was observed. All other cultivars tested proved virtually resistant to race 1, providing further evidence for genotype × race interactions. Within races, limited but statistically significant genotype × isolate interactions were found as well, in particular within race 4. These are tentatively attributed to independent variation of two (or more) resistance components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042615
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  • 6
    Electronic Resource
    Electronic Resource
    Inheritance of resistance to Phytophthora fragariae Hickman in strawberry (1989)
    Springer
    Euphytica 42 (1989), S. 25-30 
    Details
    ISSN: 1573-5060
    Keywords: Fragaria sp. ; inheritance ; Phytophthora fragariae ; red core ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary It has been found that complete resistance of the strawberry cultivars and selections Earliglow, Guardian, MdUS 2700, MdUS 2929, MdUS 3816 and Redchief to Phytophthora fragariae is inherited in a one-to-one ratio, suggesting that these genotypes have one major resistance gene effective to the races present in the test field. The high level of partial resistance of Cambridge Favourite has clearly been recovered in its progenies. However, from results presented here, no conclusions could be drawn with regard to the number of genes involved in the partial resistance of Cambridge Favourite. It is, however, suggestive that about half the susceptible selections derived from crosses with Cambridge Favourite have shown a relatively high level of partial resistance. The selections concerned were obtained by selection on horticultural characters in seedling populations planted on an uninfested field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042610
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  • 7
    Electronic Resource
    Electronic Resource
    Inheritance of resistance to Zucchini yellow mosaic virus in the interspecific cross Cucurbita maxima × C. ecuadorensis (1989)
    Springer
    Euphytica 42 (1989), S. 227-232 
    Details
    ISSN: 1573-5060
    Keywords: Cucurbita maxima × C. ecuadorensis ; interspecific cross ; Zucchini yellow mosaic virus ; resistance ; Elisa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Inheritance of resistance to zucchini yellow mosaic virus (ZYMV) in the interspecific cross Cucurbita maxima × C. ecuadorensis was studied in generations P1, P2, F1, F2, BCP1 and BCP2. The continuous variation presented in these generations implies a quantitative inheritance. The resistance in C. ecuadorensis was partially dominant over that of sensitivity in C. maxima. Several genes with major effects along with genes with minor effects seem to control ZYMV resistance. Both the dominant and the additive contribution to resistance were found to be significant; their interaction was also significant. However, the major contribution was due to the additive rather than the dominance effects. The narrow sense heritability is 0.91. Virus titer as measured by enzyme linked immunosorbent assay (ELISA) was positively correlated (r=0.76) with the intensity of visual symptoms. The efficiency of ELISA as a tool to the breeders, and the use of C. ecuadorensis as a source of resistance to ZYMV are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034458
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  • 8
    Electronic Resource
    Electronic Resource
    Screening for resistance to Nectria galligena Bres. in cut shoots of apple (1989)
    Springer
    Euphytica 42 (1989), S. 233-240 
    Details
    ISSN: 1573-5060
    Keywords: Malus sp. ; apple ; Nectria galligena ; apple canker ; resistance ; screening method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary To find a fast and reliable test to assess resistance to Nectria galligena in apple, different methods of inoculation were compared using macroconidia of N. galligena and one-year-old cut shoots from mature trees of Cox's Orange Pippin, IVT 69078-19, James Grieve and Jonathan. With the best inoculation method 11 genotypes were screened for resistance. Elstar, Golden Delicious, Jonathan and Lombart's Calville were highly resistant and the level of resistance of Ingrid marie, Gloster, Melrose, IVT 69078-19, Cox's Orange Pippin, James Grieve and Idared decreased in this order. The best inoculation method proved to be simple, giving results within four to nine weeks after inoculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034459
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  • 9
    Electronic Resource
    Electronic Resource
    Race-specificity of temperature-sensitive genes for resistance to Puccinia striiformis in Triticum dicoccoides (1989)
    Springer
    Euphytica 43 (1989), S. 7-14 
    Details
    ISSN: 1573-5060
    Keywords: Triticum dicoccoides ; wild emmer wheat ; Puccinia striiformis ; yellow rust ; stripe rust ; minor genes ; temperature-sensitive genes ; resistance ; race-specificity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Twenty-four entries of wild emmer possessing temperature-sensitive genes for resistance to yellow rust were studied in the seedling stage, at two temperature-profiles, with 15 pathogenic races from 11 countries in South America, Africa, Asia and Europe. It was shown that the majority of the resistance genes in these wild emmer entries were race-specific. In most of these entries a more resistant reaction was displayed at the higher temperature-profile; however in three entries a shift in reaction towards resistance was observed with certain races but towards susceptibility with some of the other races, suggesting that two different kinds of temperature-sensitive genes were involved in each of these entries. The similarity of temperature-sensitive genes occurring in wild emmer and in cultivated wheat is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037890
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  • 10
    Electronic Resource
    Electronic Resource
    Comparison of leaf and pod disease reactions of beans (Phaseolus vulgaris L.) inoculated by different methods with strains of Xanthomonas campestris pv. Phaseoli (Smith) dye (1989)
    Springer
    Euphytica 43 (1989), S. 143-152 
    Details
    ISSN: 1573-5060
    Keywords: Phaseolus vulgaris ; common bean ; Xanthomonas campestris pv. phaseoli ; bacterial disease ; common blight ; rapid leaf chlorosis ; inoculation methods and concentrations ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Common blight disease in beans (Phaseolus vulgaris), caused by the bacterium Xanthomonas campestris pv. phaseoli, reduces crop yield and seed quality. Information is needed on the variation of leaves and pods disease reaction to strains of the bacterium after different inoculation methods. Phaseolus vulgaris cultivars ‘Red Kidney Charlevoix’, ‘GN Harris’, ‘GN 1140’, and ‘GN Emerson’ were inoculated with three different strains of Xanthomonas campestris pv. phaseoli at two inoculum concentrations (108 and 106 bacterial cells/ml) using water soaking, multiple needle, and razor blade inoculation on leaves, and razor blade scratch, dissecting needle, and razor blade cut inoculation on pods. Differential cultivar disease reactions of leaves, pods, or both to the bacterial strains were observed in some cases. Significant interactions among cultivars, inoculation methods, strains, and inoculum concentrations (leaves) were found. A rapid leaf chlorosis developed 6 to 7 days after inoculation. Strains of bacteria did not show specificity in inducing this reaction, but rapid leaf chlorosis was associated with high inoculum concentration and with the water soaking and multiple needle methods. Another experiment was conducted to count the number of living bacterial cells deposited in the leaf tissue after inoculation by different methods. The number of bacteria deposited by water soaking or multiple needle was higher than that deposited by razor blade.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037907
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  • 11
    Electronic Resource
    Electronic Resource
    Inheritance of resistance to Botrytis cinerea Pers. in Cicer arietinum L. (1989)
    Springer
    Euphytica 44 (1989), S. 61-63 
    Details
    ISSN: 1573-5060
    Keywords: Cicer arietinum ; chickpea ; Botrytis cinerea ; grey mould ; inheritance ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Chickpea (Cicer arietinum L.) line ICC 1069 was selected as resistant parent after screening for resistance to grey mould (Botrytis cinerea Pers.) under artificial inoculation conditions. It was crossed with four high yielding susceptible varieties of chickpea. Crosses ICC 1069 × BGM 413 and ICC 1069 × BG 256 showed monogenic dominant resistance in ratio of 3R (resistant): 1S (susceptible). However, in crosses, ICC 1069 × BGM 419 and ICC 1069 × BGM 408, a ratio of 13S (susceptible) : 3R (resistant) was obtained indicating the presence of epistatic interaction. The results pointed towards the presence of a type of major gene resistance to grey mould in chickpea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022600
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  • 12
    Electronic Resource
    Electronic Resource
    The development of Raparadish (x Brassicoraphanus, 2n=38), a new crop in agriculture (1989)
    Springer
    Euphytica 40 (1989), S. 1-14 
    Details
    ISSN: 1573-5060
    Keywords: Raparadish x Brassicoraphanus ; Brassica rapa ; Raphanus sativus ; amphidiploid ; intergeneric hybrid ; fertility ; resistance ; beet cyst nematode ; Heterodera schachtii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Raparadish, x Brassicoraphanus, the amphidiploid hybrid between Brassica rapa (syn. B.campestris) and Raphanus sativus (fodder radish) was made by Dolstra (1982). Primary hybrid plants grew vigorously, suggesting that the amphidiploid AARR might be useful as a fodder crop. Three populations of this new material were studied, with special attention to improvement of fertility and resistance to beet cyst nematode (Heterodera schachtii), whilst preserving genetic variability. For lack of progress one of the populations was abandoned after the fourth generation. The other two populations were observed through nine or ten generations. Apart from the last two generations mass selection for seed set was carried out on the basis of single plants. This led to a considerable increase in average seed production, without losing a wide variation for this trait. Thus more progress is being expected. Five cycles of mass selection for resistance to beet cyst nematodes led to a considerable increase of the level of resistance of both populations. The prospects of this new agricultural crop are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023291
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  • 13
    Electronic Resource
    Electronic Resource
    Comparison of sources of resistance to leaf aphids in lettuce (Lactuca sativa L.) (1989)
    Springer
    Euphytica 40 (1989), S. 21-29 
    Details
    ISSN: 1573-5060
    Keywords: Lactuca sativa ; lettuce ; Macrosiphum euphorbiae ; Myzus persicae ; Nasonovia ribisnigri ; leaf aphids ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Three lines of lettuce with resistance to Nasonovia ribisnigri, based on the dominant Nr-gene, and four lines selected for partial resistance to Myzus persicae were tested against three species of leaf aphid: N. ribisnigri, M. persicae and Macrosiphum euphorbiae. The effect of the Nr-gene was also studied in a segregating F2 population. In the material tested, resistance to N. ribisnigri was exclusively based on the Nr-gene, lines selected only for resistance to M. persicae showed no resistance to N. ribisnigri. The Nr-gene also induces partial resistance to M. persicae, but the level of this resistance is influenced by other genes, because the lines with Nr-gene differed significantly from each other for reproduction of M. persicae. The Nr-gene had no effect on the resistance of lettuce to M. euphorbiae. In lines with the Nr-gene, levels of resistance to M. persicae and to M. euphorbiae were correlated, suggesting that the resistance may be determined by the same genes. The Nr-line with highest resistance to M. persicae was comparable for this characteristic to the lines selected for resistance to M. persicae. The cultivars Taiwan and Ravel possess a resistance factor to M. euphorbiae that has no effect on M. persicae or N. ribisnigri. Lines selected for resistance to M. persicae also showed partial resistance to M. euphorbiae. Based on the present results no conclusions can be drawn whether this resistance is based on the same genes that provide resistance to M. persicae, or on a resistance factor comparable to that found in Taiwan and Ravel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023293
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  • 14
    Electronic Resource
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    Screening for resistance to take-all in wheat, triticale and wheat-triticale hybrid lines (1989)
    Springer
    Euphytica 40 (1989), S. 103-109 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; triticale ; wheat-triticale hybrids ; Secale cereale ; rye ; Gaeumannomyces graminis ; take-all ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Fifteen triticale and wheat-triticale hybrid lines were evaluated for resistance to the take-all fungus Gaeumannomyces graminis var. tritici and compared with five wheat and two rye lines in inoculated field and pot trials. The triticale and wheat-triticale hybrid lines varied in rye chromosome number and degree of resistance expressed. One line, Venus with seven pairs of rye chromosomes consistently showed levels of resistance intermediate between wheat and rye. A trend was observed where increasing rye chromosome content led to greater resistance but exceptions showed that variation within triticales could not be ascribed to rye chromosome content alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023304
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  • 15
    Electronic Resource
    Electronic Resource
    Incompletely dominant single resistance gene for peanut stripe virus in soybean line AGS 129 (1989)
    Springer
    Euphytica 40 (1989), S. 193-196 
    Details
    ISSN: 1573-5060
    Keywords: Glycine max ; soybean ; genetics ; peanut stripe virus ; resistance ; incomplete dominance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Inheritance of resistance to a soybean isolate of peanut stripe virus (PStV-strain PN) was studied in three soybean varieties, AGS 129, Ankur, and PI 230971. Genetic analysis was based on necrotic, mosaic and symptomless reactions in inoculated soybeans. A single incompletely dominant gene in AGS 129 was found to confer the resistance to PStV and was tentatively designated as Pst. The homozygous parent AGS 129, possessing the genotype Pst Pst, was immune while Ankur and PI 230971, with a genotype of pst pst, were susceptible showing mosaic symptoms. The heterozygous genotype Pst pst resulting from the cross of either Ankur or PI 230971 with AGS 129 reacted with necrosis, distinctly different from either of the homozygous genotypes. This genotypic effect was confirmed through the phenotypic segregation in BC, F2, and F3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024511
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  • 16
    Electronic Resource
    Electronic Resource
    Potential sources of resistance to lettuce downy mildew (Bremia lactucae) in differentLactuca species (1989)
    Springer
    Euphytica 40 (1989), S. 227-232 
    Details
    ISSN: 1573-5060
    Keywords: Lactuca ; lettuce ; Bremia lactucae ; resistance ; seedlings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary More than 200 accessions of three wildLactuca species were screened in the laboratory for race-specific resistance toBremia lactucae. Only a fewLactuca entries showed resistance both as seedlings and in a leaf disc test. Accessions ofL. serriola andL. sativa had a low degree of resistance. The best entries were also compared under field conditions. TheL. saligna entries were totally free from disease in the field test. High resistance was also recorded in a fewL. serriola entries and in lettuce cultivars such as Saffier and Mariska.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024516
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  • 17
    Electronic Resource
    Electronic Resource
    Inheritance of resistance to potato virus Y in garden pepper (Capsicum annuum L.) (1989)
    Springer
    Euphytica 42 (1989), S. 31-33 
    Details
    ISSN: 1573-5060
    Keywords: Capsicum annuum ; garden pepper ; potato virus Y ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Bell pepper suffers considerable losses from a strain of potato virus Y (PVYo-sbp). Crosses were attempted between two resistant lines Perennial and S41-1 and two highly susceptible bell pepper commercial cultivars California Wonder and Yolo Wonder. Studies of F1's, F2's, back crosses and F3's indicated that Perennial and S41-1 carry a recessive gene imparting resistance to potato virus Y.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042611
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  • 18
    Electronic Resource
    Electronic Resource
    Variation in forage grasses as hosts of the root-knot nematode Meloidogyne naasi (Franklin) and selection for resistance in ryegrass (1989)
    Springer
    Euphytica 43 (1989), S. 135-141 
    Details
    ISSN: 1573-5060
    Keywords: Lolium perenne ; perennial ryegrass ; L. multiflorum ; Italian ryegrass ; Festuca pratensis ; meadow fescue ; F. arundinacea ; tall fescue ; Festuca × Lolium hybrids ; Phleum pratense ; timothy ; Dactylis glomerata ; cocksfoot ; Meloidogyne naasi ; root-knot nematode ; resistance ; selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Reactions of 13 grasses to Meloidogyne naasi varied with species; ryegrasses, fescues and their hybrids were generally susceptible and cocksfoot and timothy resistant. Marked variation in host resistance levels occurred between genotypes within cultivars. Selection of single plants, followed by tests on replicate tillers, identified resistant and susceptible genotypes in both Italian and perennial ryegrass cultivars. Resistant plants had few nematode-induced galls and fewer females and eggs than susceptibles. There was more or less continuous variation, with many genotypes intermediate between extremes of resistance and susceptibility. Selected resistant and susceptible genotypes are of use in assessing variation in nematode populations and as controls for breeding and selection programmes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037906
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  • 19
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    Electronic Resource
    Linkage relationship between two genes conferring resistance to peanut stripe virus and soybean mosaic (1989)
    Springer
    Euphytica 44 (1989), S. 163-166 
    Details
    ISSN: 1573-5060
    Keywords: Glucine max ; soybean ; peanut stripe virus ; resistance ; genetics ; linkage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The possible linkage relationship between hypocotyl color, leaflet shape, resistance to soybean mosaic virus (SMV) and to a soybean isolate of peanut stripe virus (PStV-isolate PN) was examined in two soybean lines AGS 129 and Ankur. Hypocotyl color, leaf shape and reactions to SMV-G1 and PStV were found to be inherited monogenically, with purple hypocotyl color, ovate leaf shape and resistance to both of the viruses being dominant. The reactions to SMV and PStV were conditioned by genes with 9 ± 2.4 percent recombination as coupling phase. They were inherited independently from hypocotyl color and leaf shape.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022612
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  • 20
    Electronic Resource
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    An epidemic of celery mosaic potyvirus in celeriac (Apium graveolens var. rapaceum) in the Netherlands (1989)
    Springer
    European journal of plant pathology 95 (1989), S. 225-240 
    Details
    ISSN: 1573-8469
    Keywords: aphid transmission ; celery latent virus ; cucumber mosaic cucumoviurs ; resistance ; sources of infection ; tobacco rattle tobravirus ; virus ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Samenvatting Sinds 1969 trad gedurende een aantal opeenvolgende jaren in de provincie Zeeland in knolselderij een ernstige virusziekte epidemisch op. Vaak mislukten gewassen geheel. Uit viruszieke planten konden het latente selderijvirus, komkommermozaïekvirus, tabaksratelvirus en een potyvirus worden geïsoleerd. Het laatste kwam echter het meest voor en was in zijn optreden gecorreleerd met de voor de epidemie karakteristieke symptomen. Het kon op grond van waardplanten en symptomen, deeltjesvorm en grootte (ca 780 nm) en serologie worden geïdentificeerd als het selderijmozaïekvirus. In de kas konden in selderij de voor de ziekte kenmerkende symptomen ermee worden gereproduceerd. Reeds in 1970 waren in de omgeving van Kruiningen en Waarde in 12 van de 25 geïnspecteerde velden meer dan 60% van de planten ziek. Een systematische inventarisatie gedurende 1971 tot en met 1977 toonde aan dat de ziekte in die periode snel verder om zich heen greep en de teelt in het oorspornkelijke teeltgebied niet meer lonend maakte. De ziekte volgde echter geleidelijk de noordwaarts uitwijkende teelt. In 1976 was 41% van de 117 geïnspecteerde velden voor meer dan 75% aangetast. In zulke velden kon het percentage zieke planten vanaf eind juli tot begin september toenemen van 0 tot nagenoeg 100. De eerste symptomen treden jaarlijks rond eind juli of begin augustus op. Proeven, waarbij veldjes met planten gedurende bepaalde perioden werden afgedekt met bladluisdichte gaaskooien, toonden aan dat de eerste infectie optreedt ca 3 weken (2–4) voor het verschijnen van de eerste symptomen en op zijn vroegst begin juli, en dat verdere verspreiding nog tot na 20 september plaatsvindt. De besmettingsbronnen zijn nog steeds niet gevonden. De wijze van optreden van de ziekte in het veld doet vermoeden dat het virus niet afkomstig is van dichtbij voorkomende wilde planten. Er blijken grote rasverschillen in resistentie te bestaan. De voor consumptie en conservenverwerking gewilde rassen, waaronder vooral ‘Roem van Zwijndrecht’, zijn alle zeer kwetsbaar. Met het geleidelijk naar voren komen van meer resistante, en voor de export vooral gevraagde anthocyanine-vrije rassen, zoals ‘Monarch’ en ‘Iram’, heeft de knolselderijteelt zich in Zeeland grotendeels hersteld.
    Notes: Abstract An annually recurring virus epidemic has caused severe damage and sometimes total yield loss in crops of celeriac in the south-west of the Netherlands for several years since 1969. Celery leatent virus, cucumber mosaic cucumovirus and tobacco rattle tobravirus were isolated from diseased plants, but a potyvirus was the most prevalent virus present. It did not cause local lesions inChenopodium amaranticolor orC. quinoa and did not infect other non-Umbelliferae. The virus was identified as celery mosaic potyvirus and confirmed to be the causal agent. Field surveys from 1971 to 1977 showed a rapid increase of disease incidence in consecutive years, soon leading to near-abandonment of the crop in the original centre of cultivation and its northward translocation, gradually followed by the disease. Incidence in fields often increased from zero by the end of July, when symptoms first appeared, to 100% early during September. In 1976 final incidence was 75 to 100% in 41% of the fields inspected. Temporary protection with aphid-proof cages showed that first infection occurred about three weeks before symptoms appear and not before the beginning of July, and that the virus may still spread after late September. When testing samples from other umbelliferous crops and wild species near infested crops, several viruses were detected but not celery mosaic virus. The virus may be introduced from yet unknown distant sources, as also suggested by the pattern of spread in crops of celeriac. Celeriac cultivars differe considerably in resistance to the virus, but resistant cultivars generally are of poorer quality for consumption and processing than the original highly sensitive cultivar. In recent years cultivation has recovered considerably with the advent of new cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01977808
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  • 21
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    Electronic Resource
    Further identification of races of Cladosporium fulvum (Fulvia fulva) on tomato originating from the Netherlands France and Poland (1989)
    Springer
    European journal of plant pathology 95 (1989), S. 143-148 
    Details
    ISSN: 1573-8469
    Keywords: gene-for-gene interaction ; leaf mold disease ; Lycopersicon esculentum ; resistance ; susceptibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Samenvatting Fysio's vanCladosporium fulvum, die de resistentie-genen Cf2, Cf4, Cf5, Cf8, Cf9 en Cf11 kunnen doorbreken, zijn in Nederland, Frankrijk en Polen opgetreden. Met behulp van een groep genotypen, die de resistentie genen Cf2 tot en met Cf11 dragen, zijn Nederlandse, Franse en enkele nieuwe Poolse isolaten onderzocht op de aanwezigheid van virulentiegenen. Enkele Nederlandse isolaten, eerder aangeduid met 2.4, 2.4.5. en 2.4.5.9, bleken het resistentie-gen Cf11 te kunnen doorbreken. Deze moeten daarom aangeduid worden als respectievelijk 2.4.11, 2.4.5.11 en 2.4.5.9.11. In de nieuwe Poolse isolaten werd virulentie gevonden voor Cf2, Cf4, Cf8, Cf9 en Cf11. Alle fysio's die op genotypen met Cf4 konden groeien, groeiden ook op genotypen met Cf8. Daarom kon geen ondersheid gemaakt worden tussen Cf4 en Cf8. De Poolse isolaten behoren tot de fysio's 4.11, 2.4.11 en 2.4.9.11. De gevolgen van het voorkomen van deze fysio's voor de tomateveredeling worden besproken.
    Notes: Abstract Races ofCladosporium fulvum, which can overcome the resistance of the genes Cf2, Cf4, Cf5, Cf8, Cf9 and Cf11 have appeared in the Netherlands, France and Poland. Known isolates from the Netherlands and France and three new isolates from Poland have been investigated for the presence of virulence genes using a set of genotypes carrying resistance genes Cf2 to Cf11.Several Dutch isolates of races, earlier designated as 2.4, 2.4.5 and 2.4.5.9, were found to break down the resistance gene Cf11. These races must therefore be designated as 2.4.11, 2.4.5.11 and 2.4.5.9.11 respectively. In the new Polish isolates virulence genes, overcoming the resistance genes Cf2, Cf4, Cf8, Cf9 and Cf11 were found. Since all races able to grow on genotypes with Cf4, could also grow on genotypes carrying Cf8, it was impossible to discriminate between the genes Cf4 and Cf8. These Polish isolates were designated as races 4.11, 2.4.11 and 2.4.9.11. The consequences of the occurrence of these races for tomato breeding are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01999969
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