Breakdown of resistance to grapevine downy mildew upon limited deployment of a resistant variety |
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| Authors: | Elisa Peressotti Sabine Wiedemann-Merdinoglu François Delmotte Diana Bellin Gabriele Di Gaspero Raffaele Testolin Didier Merdinoglu Pere Mestre |
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| Institution: | 1.INRA, UMR1131 Santé de la Vigne et Qualité du Vin,Colmar,France;2.Université de Strasbourg, UMR1131 Santé de la Vigne et Qualité du Vin,France;3.INRA, UMR1065 Santé Végétale, Institut des Sciences de la Vigne et du Vin - Bordeaux Aquitaine,Villenave d'Ornon,France;4.Dipartimento di Scienze Agrarie e Ambientali,University of Udine,Udine,Italy;5.Istituto di Genomica Applicata, Parco Scientifico e Tecnologico Luigi Danieli,Udine,Italy;6.Dipartimento di Biotecnologie,University of Verona,Verona,Italy |
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| Abstract: | Background Natural disease resistance is a cost-effective and environmentally friendly way of controlling plant disease. Breeding programmes
need to make sure that the resistance deployed is effective and durable. Grapevine downy mildew, caused by the Oomycete Plasmopara viticola, affects viticulture and it is controlled with pesticides. Downy mildew resistant grapevine varieties are a promising strategy
to control the disease, but their use is currently restricted to very limited acreages. The arising of resistance-breaking
isolates under such restricted deployment of resistant varieties would provide valuable information to design breeding strategies
for the deployment of resistance genes over large acreages whilst reducing the risks of the resistance being defeated. The
observation of heavy downy mildew symptoms on a plant of the resistant variety Bianca, whose resistance is conferred by a
major gene, provided us with a putative example of emergence of a resistance-breaking isolate in the interaction between grapevine
and P. viticola. |
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