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Poster

Session: Session 2 Presenting Authors at Posters (Odds)

P-071 - Search for recessive resistance genes to downy and powdery mildew in grapevine for the development of durable resistance varieties.

Wednesday, July 16, 2025
13:30 - 15:15  
Location: Confex Hall 3
Crop resistance genetics and genomics
Cultivated grapevine (Vitis vinifera) is susceptible to several diseases, such as downy and powdery mildew, which are mainly controlled by pesticides. An alternative to chemicals is the introduction of resistance genes from wild Vitis species into V. vinifera, in order to develop resistant varieties. The resistance factors found in these species are dominant NOD-Like Receptor (NLR) genes which, by their nature, are not durable. Hence the need for new strategies to ensure resistance durability. One such strategy would be using recessive resistance genes, which have been proved efficient for resistance to downy or powdery mildew in other species. Considering that grapevine is highly heterozygous, we hypothesized that in the grapevine gene pool there would exist alleles with the potential to function as recessive resistance genes to downy and powdery mildew. After identifying orthologs of candidate genes in grapevine, we studied their genetic variability in a collection of grapevine accessions and found mutations that could modify protein function and lead to recessive resistance. Two selected accessions were self-fertilized, and their offspring will be grown and tested for potential resistance to downy mildew. In parallel, self-fertilized populations of V. vinifera varieties, selected without a priori assumptions, were evaluated for resistance to downy mildew and some resistant individuals were identified in one of the populations.