Search for genotypes resistant to <i>Plasmopara viticola</i> by crossbreeding
Keywords:Plasmopara, oidium, variety of vine, genotype, resistance, tolerance, quality, crossing, analysis, Italy
AbstractCrossbreeding between Vitis vinifera and hybrids resistant to some grapevine diseases began in 1985 in order to create biotypes which are tolerant or resistant to Plasmopara viticola. Oidium tuckeri and Botrytis cinerea and show quality features similar as the European parent varieties (Chardonnay, Sauvignon blanc, Prosecco, Moscato bianco and Cabernet Sauvignon) in order to reduce chemical plant protection practices.
Analysis of the F1 population emphasized that 20% of the plants have a favourable tolerance to downy mildew and can be employed in back-crossbreeding with European varieties. This proves that there is a different intensity of leaf reaction to the pathogenic agent.
The above-mentioned tolerance appeared to be steady throughout the years.
An interesting tolerance to oidium was also recorded in open field and greenhouse cultivations.
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