Resistance Breakdown in Grapevine Downy Mildew
Author Information
Author(s): Elisa Peressotti, Sabine Wiedemann-Merdinoglu, François Delmotte, Diana Bellin, Gabriele Di Gaspero, Raffaele Testolin, Didier Merdinoglu, Pere Mestre
Primary Institution: INRA, UMR1131 Santé de la Vigne et Qualité du Vin, Colmar, France
Hypothesis
Is the downy mildew isolate growing in Bianca a resistance-breaking isolate or a highly aggressive isolate?
Conclusion
The study identifies a P. viticola isolate that overcomes the resistance of the grapevine cultivar Bianca, indicating that resistance-breaking isolates can emerge even with limited deployment of resistant varieties.
Supporting Evidence
- Isolate SL was shown to grow on resistant plants without triggering a hypersensitive reaction.
- Molecular analysis indicated that isolate SL is genetically related to other P. viticola isolates.
- QTL mapping revealed that the Rpv3 QTL was absent in plants infected with isolate SL.
Takeaway
Scientists found a type of downy mildew that can get past the grapevine's defenses, which is a warning for farmers using resistant plants.
Methodology
The study involved inoculating grapevine leaf discs with different P. viticola isolates and assessing their growth and sporulation.
Limitations
The study is based on a limited number of grapevine varieties and may not represent all possible interactions.
Statistical Information
P-Value
0.00011
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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