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Type: Journal article
Title: Abscisic acid down-regulates hydraulic conductance of grapevine leaves in isohydric genotypes only
Author: Coupel-Ledru, A.
Tyerman, S.
Masclef, D.
Lebon, E.
Christophe, A.
Edwards, E.
Simonneau, T.
Citation: Plant Physiology, 2017; 175(3):1121-1134
Publisher: American Society of Plant Biologists
Issue Date: 2017
ISSN: 0032-0889
Statement of
Aude Coupel-Ledru, Stephen D. Tyerman, Diane Masclef, Eric Lebon, Angélique Christophe, Everard J. Edwards, and Thierry Simonneau
Abstract: Plants evolved different strategies to cope with water stress. While isohydric species maintain their midday leaf water potential (ΨM) under soil water deficit by closing their stomata, anisohydric species maintain higher stomatal aperture and exhibit substantial reductions in ΨM. It was hypothesized that isohydry is related to a locally higher sensitivity of stomata to the drought-hormone abscisic acid (ABA). Interestingly, recent lines of evidence in Arabidopsis suggested that stomatal responsiveness is also controlled by an ABA action on leaf water supply upstream from stomata. Here, we tested the possibility in grapevine that different genotypes ranging from near isohydric to more anisohydric may have different sensitivities in these ABA responses. Measurements on whole plants in drought conditions were combined with assays on detached leaves fed with ABA. Two different methods consistently showed that leaf hydraulic conductance (Kleaf) was downregulated by exogenous ABA, with strong variations depending on the genotype. Importantly, variation between isohydry and anisohydry correlated with Kleaf sensitivity to ABA, with Kleaf in the most anisohydric genotypes being unresponsive to the hormone. We propose that observed response of Kleaf to ABA may be part of the overall ABA regulation of leaf water status.
Keywords: Vitis; Plant Leaves; Water; Abscisic Acid; Down-Regulation; Genotype; Models, Biological; Plant Exudates; Genetic Variation
Description: Published September 12, 2017.
Rights: © 2017 American Society of Plant Biologists. All Rights Reserved. [OPEN] Articles can be viewed without a subscription.
RMID: 0030076042
DOI: 10.1104/pp.17.00698
Grant ID:
Appears in Collections:Agriculture, Food and Wine publications

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