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Traditional resistance breeding far too often relies on the uniform and wide-spread deployment of dominant resistance genes that mediate pathogen recognition and immunity. This strategy is very effective but also relatively short sighted, because the evolutionary breakdown of major gene resistances is relatively certain. Pyramiding multiple major genes is a viable strategy to avoid resistance breakdown, but only if resistance genes can be monopolized by breeders that all adhere to the pyramiding strategy. In our work, we examine two alternative ways to achieve more durable disease control by resistance breeding. On the one hand, we search for new types of resistances in grapevine, whereby recessive, loss-of-susceptibility alleles confer resistance and may also pose a more difficult challenge to evolving pathogen populations. On the other hand, we study variety mixtures as a way to increase genetic within-field diversity and the benefits they can provide in terms of increased yield, stability and disease suppression. Both strategies have shown their merit in the past, but could probably be exploited more effectively in the future, especially when combined.

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https://inrae-fr.zoom.us/j/94675190133?pwd=eVZpOXU3bzRjUGhYSDl1TkswM1pMUT09

ID meeting : 946 7519 0133

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