The results of the apple breeding for digenic resistance to scab (1979–2000), which is more long-term than the monogenic breeding, have been reviewed. The hybrid seeds obtained from the reciprocal crossing between the V f and V m resistance gene donors served as the original material. The seed progeny yielded by backcrosses between these hybrids and the susceptible cultivars were examined (age—first true leaves) using inoculation in a greenhouse. The following criteria were proposed for breeding parental forms and the cultivars of the V f v f V m v m genotype: (1) phenotype segregation in the progeny of three resistant: one susceptible seedling and (2) the presence in the progeny of two types of resistant seedlings: those with the class 1 resistance (points and spots—hypersensitivity) typical of the V m gene and those with the class 2–3 resistance (chlorotic and necrotic spots) typical of the V f gene.
Russian Journal of Genetics – Springer Journals
Published: Oct 13, 2004
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