Breeding for the Digenic Apple Resistance to Scab

Breeding for the Digenic Apple Resistance to Scab 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

Breeding for the Digenic Apple Resistance to Scab

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Kluwer Academic Publishers-Plenum Publishers
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Biomedicine; Human Genetics
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