Abscisic Acid Down-Regulates Hydraulic Conductance of Grapevine Leaves in Isohydric Genotypes Only

Aude Coupel-Ledru, Stephen D Tyerman, Diane Masclef, Eric Lebon, Angélique Christophe, Everard J Edwards, Thierry Simonneau

Research output: Contribution to journalArticle (Academic Journal)peer-review

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 (Arabidopsis thaliana) 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 (Vitis vinifera) 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 down-regulated 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 the observed response of Kleaf to ABA may be part of the overall ABA regulation of leaf water status.

Original languageEnglish
Pages (from-to)1121-1134
Number of pages14
JournalPlant Physiology
Volume175
Issue number3
DOIs
Publication statusPublished - Nov 2017

Bibliographical note

© 2017 American Society of Plant Biologists. All Rights Reserved.

Keywords

  • Abscisic Acid/pharmacology
  • Down-Regulation/drug effects
  • Genetic Variation
  • Genotype
  • Models, Biological
  • Plant Exudates/metabolism
  • Plant Leaves/drug effects
  • Vitis/drug effects
  • Water/physiology

Fingerprint Dive into the research topics of 'Abscisic Acid Down-Regulates Hydraulic Conductance of Grapevine Leaves in Isohydric Genotypes Only'. Together they form a unique fingerprint.

Cite this