Genetic dissection of partial resistance to race 6 of Venturia inaequalis in apple

C.E. Durel, L. Parisi, F.N.D. Laurens, W.E. van de Weg, R. Liebhard, B. Koller, M.F. Jourjon

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    Abstract

    Scab, caused by the fungus Venturia inaequalis, is one of the most important diseases of apple (Malus × domestica). The major resistance gene, Vf, has been widely used in apple breeding programs, but two new races of the fungus (races 6 and 7) are able to overcome this gene. A mapped F1 progeny derived from a cross between the cultivars Prima and Fiesta has been inoculated with two monoconidial strains of race 6. These strains originated from sporulating leaves of 'Prima' and a descendant of 'Prima' that were grown in an orchard in northern Germany. 'Prima' carries the Vf resistance gene, whereas 'Fiesta' lacks Vf. A large variation in resistance and (or) susceptibility was observed among the individuals of the progeny. Several quantitative trait loci (QTLs) for resistance were identified that mapped on four genomic regions. One of them was located in the very close vicinity of the Vf resistance gene on linkage group LG-1 of the 'Prima' genetic map. This QTL is isolate specific because it was only detected with one of the two isolates. Two out of the three other genomic regions were identified with both isolates (LG-11 and LG-17). On LG-11, a QTL effect was detected in both parents. The genetic dissection of this QTL indicated a favourable intra-locus interaction between some parental alleles.Key words: Malus × domestica, partial resistance, Venturia inaequalis, resistance breakdown, quantitative trait locus
    Original languageEnglish
    Pages (from-to)224-234
    JournalGenome
    Volume46
    Issue number2
    DOIs
    Publication statusPublished - 2003

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    Keywords

    • quantitative trait loci
    • scab resistance
    • disease resistance
    • vf source
    • construction
    • evolution
    • cloning
    • library
    • plants
    • family

    Cite this

    Durel, C. E., Parisi, L., Laurens, F. N. D., van de Weg, W. E., Liebhard, R., Koller, B., & Jourjon, M. F. (2003). Genetic dissection of partial resistance to race 6 of Venturia inaequalis in apple. Genome, 46(2), 224-234. https://doi.org/10.1139/g02-127