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Rootstocks and scions: how these two players interact in response to environmental conditions
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International audience. Recent studies predict that viticulture may be endangered in some traditional wine growing areasbecause of ongoing and future changes in climate. Increasing temperatures may reduce the suitabilityof currently grown varieties because of changes in phenology and fruit composition. Water scarcityand limited access to freshwater for irrigation may also affect both yield and fruit quality. In manyregions, the maintenance of wine production will rely on modifications of cultural practices to adaptgrapevines to new climatic conditions. As the vast majority of vineyards worldwide are grown grafted,rootstocks are a key component of the adaptive potential of these agrosystems. Although thereare methodological difficulties in analysing root systems in situ and scion x rootstock interactionsin a woody perennial crop like grapevine, there is an increasing scientific interest in advancing ourunderstanding of how rootstocks communicate with scions (and vice versa) and modulate grapevinefunctioning. In the last 20 years, we have been studying scion/rootstock interactions in grapevine at theagronomical, physiological, molecular and (epi)genetic levels, with the view to determine the underlyingmechanisms. This work has shown that interactions between rootstock and scion genotypes are hugeand that they are difficult to predict from individual partner performances. Mobilizing genome-basedapproaches combined to advanced phenotyping studies should improve our understanding of thiscomplex issue. Our overall objective is to provide knowledge for breeding new rootstocks and helpinggrowers to choose the best genotype combinations to adapt their vineyard to limiting environments.This talk will provide an overview of the most recent outputs of this research.
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