BORTOLAMI, Giovanni; GAMBETTA, Gregory; CASSAN, Cédric; DAYER, Silvina; FAROLFI, Elena; FERRER, Nathalie; GIBON, Yves; JOLIVET, Jérôme; LECOMTE, Pascal; DELMAS, Chloe E. L.

doi:10.1073/pnas.2112825118

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BORTOLAMI, Giovanni
Santé et agroécologie du vignoble [UMR SAVE]

GAMBETTA, Gregory

Ecophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]

CASSAN, Cédric
Biologie du fruit et pathologie [BFP]

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Proceedings of the National Academy of Sciences of the United States of America. 2021-10-21, vol. 118, n° 43, p. e2112825118

National Academy of Sciences

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In the context of climate change, plant mortality is increasing worldwide in both natural and agroecosystems. However, our understanding of the underlying causes is limited by the complex interactions between abiotic and biotic factors and the technical challenges that limit investigations of these interactions. Here, we studied the interaction between two main drivers of mortality, drought and vascular disease (esca), in one of the world’s most economically valuable fruit crops, grapevine. We found that drought totally inhibited esca leaf symptom expression. We disentangled the plant physiological response to the two stresses by quantifying whole-plant water relations (i.e., water potential and stomatal conductance) and carbon balance (i.e., CO 2 assimilation, chlorophyll, and nonstructural carbohydrates). Our results highlight the distinct physiology behind these two stress responses, indicating that esca (and subsequent stomatal conductance decline) does not result from decreases in water potential and generates different gas exchange and nonstructural carbohydrate seasonal dynamics compared to drought.< Réduire

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abiotic–biotic interactions

carbon balance

drought

plant dieback

vascular disease

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Grapevines under drought do not express esca leaf symptoms

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