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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for a race-specific resistance factor in some lettuce (Lactuca sativa L.) cultivars previously considered to be universally susceptible to Bremia lactucae regel (1981)
    Springer
    Theoretical and applied genetics 60 (1981), S. 185-189 
    Details
    ISSN: 1432-2242
    Keywords: Bremia lactucae ; Lettuce ; Race-specific resistance ; Downy mildew ; Host/pathogen genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Previously undetected race-specific resistance to Bremia lactucae (downy mildew) was located in many lettuce cultivars hitherto considered to be universally susceptible to this disease. This resistance factor(s) may also be widely distributed in other cultivars known to carry combinations of already recognised factors R1 to R11. Specific virulence to match this resistance is almost invariably present in pathogen collections. This situation may be either a relic of the evolutionary history of the B. lactucae — L. sativa asssociation or may reflect a rare mutation in B. lactucae for avirulence on all but a few specialised L. sativa genotypes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264527
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  • 2
    Electronic Resource
    Electronic Resource
    The identification and characteristics of field resistance to lettuce downy mildew (Bremia lactucae Regel) (1981)
    Springer
    Euphytica 30 (1981), S. 707-717 
    Details
    ISSN: 1573-5060
    Keywords: Lactuca sativa ; lettuce ; Bremia lactucae ; downy mildew ; field resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Eighty-one accessions of three Lactuca species which showed no recognisable race specific resistance to Bremia lactucae when tested in the laboratory as seedlings, exhibited different degrees of susceptibility when exposed to natural field infection. As a group, crisp genotypes had less mildew and a slower rate of disease development than other types of lettuce. Wild forms of Lactuca sativa and Lactuca serriola were particularly susceptible. In a further trial, the low field susceptibility of three lettuce cultivars (Iceberg, Batavia blonde de Paris and Grand Rapids) was confirmed. Disease development on cv. Iceberg was compared to that on the highly susceptible cv. Hilde in experiments where the two cultivars were grown either in close proximity or in isolation. The absolute level of attack on cv. Iceberg depended upon disease pressure and differences between the two types only became apparent approximately 8 wk after sowing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00038799
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  • 3
    Electronic Resource
    Electronic Resource
    A demonstration of the inheritance of field resistance to lettuce downy mildew (Bremia lactucae Regel.) in progeny derived from cv. Grand Rapids (1983)
    Springer
    Euphytica 32 (1983), S. 161-170 
    Details
    ISSN: 1573-5060
    Keywords: Lactuca ; lettuce ; Bremia lactucae ; downy mildew ; field resistance ; inheritance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The inheritance of field resistance to downy mildew in lettuce derived from cv. Grand Rapids was studied in F2, F3 and F4 progeny from a cross with the more susceptible cv. Lobjoits Green Cos. The results for 32 randomly produced F3 families and the F2 population corresponded closely although the absolute level of resistance varied from season to season according to disease pressure and environmental conditions. The field resistance character showed a quantitative pattern of inheritance but the rapid response to selection at F3 implied that only a few genes may be involved. F4 families raised from families selected from the two extremes of the F3 distribution fell into distinct categories with resistance levels corresponding to that of their F3 parents. An association between resistance and morphological features of the resistant parent was present at F2 but not in subsequent generations when individuals and families which were as resistant as cv. Grand Rapids and yet bore little morphological resemblance to this cultivar were readily recovered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00036876
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  • 4
    Electronic Resource
    Electronic Resource
    An association between resistance to root aphid (Pemphigus bursarius L.) and downy mildew (Bremia lactucae Regel) in lettuce (1980)
    Springer
    Euphytica 29 (1980), S. 483-488 
    Details
    ISSN: 1573-5060
    Keywords: Lactuca sativa ; lettuce ; Pemphigus bursarius ; root aphid ; Bremia lactucae ; downy mildew ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Many lettuce cultivars (Lactuca sativa L.) with high resistance to lettuce root aphid (Pemphigus bursarius L.) also carried the gene Dm-6 for specific resistance to downy mildew (Bremia lactucae Regel). This suggests the possibility of linkage between this gene and root aphid resistance. The origin of this association is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025149
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  • 5
    Electronic Resource
    Electronic Resource
    The location and characteristics of novel sources of resistance to Bremia Lactucae Regel (downy mildew) in wild Lactuca L. Species (1981)
    Springer
    Euphytica 30 (1981), S. 659-668 
    Details
    ISSN: 1573-5060
    Keywords: Bremia lactucae ; downy mildew ; Lactuca species ; lettuce ; resistance ; physiologic races
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Twenty-one accessions of 3 wild Lactuca species which could be hybridised with L. sativa, the cultivated lettuce, were inoculated at different stages of plant development with 3 multivirulent isolates of Bremia lactucae. Nineteen sources of resistance to B. lactucae, not attributable to the previously recognised resistance factors 1–11 were identified. Two lines of L. serriola showed similar resistance patterns as lines carrying R11. The resistance of some accession was incomplete particularly at the seedling stage and this phenomenon may be race specific. Tests on segregating F2 populations of crosses between 2 different L. serriola accessions and L. sativa cultivars showed that the resistance in one line (LSE/18) appears to be inherited as a single dominant gene, which is sometimes incomplete in expression and allelic to either Dm6 or R7. The segregation patterns for resistance in PI 281876 did not give readily interpretable ratios. To assess the frequency of occurrence in B. lactucae populations of virulence factors to overcome this novel resistance, 11 of the novel sources of resistance were inoculated with numerous collections of the pathogen from the UK, Czechoslovakia and elsewhere and found to show a high level of resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00038794
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  • 6
    Electronic Resource
    Electronic Resource
    The use of sexual progeny of Bremia Lactucae Regel to improve the efficiency of selection for race-specific resistance genes to this fungus in lettuce (1983)
    Springer
    Euphytica 32 (1983), S. 475-478 
    Details
    ISSN: 1573-5060
    Keywords: Lactuca sativa ; lettuce ; Bremia lactucae ; downy mildew ; resistance breeding ; sexual progeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021457
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