Resistance toV. inaequalis, derived from the small‐fruited speciesMalus floribunda821, is determined by a major dominant gene, assigned asVf.The material used in this paper is based on the introgression of theVfgene fromM. floribundainto commercial apple varieties. Comparing RAPD patterns of a genomic DNA sample ofM. floribundawith a pooled DNA sample of resistant individuals and that of 10 susceptible commercial apple varieties, fragments were identified which are derived fromM. floribunda.One of them, the fragment OPD20/600, proved to be linked to theVfgene with a recombination value of about 0.20—0.25. It is the first DNA marker so far for scab resistance.
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Yang et al. (1994) studied this question.
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