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The dual effect of abscisic acid on stomata

Authors :
Thierry Simonneau
Dorothée Jannaud
Joaquim Miguel Costa
Fabien Monnet
Bertrand Muller
Bernard Genty
Jeanne Renaud
Florent Pantin
Écophysiologie des Plantes sous Stress environnementaux (LEPSE)
Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Institut de Biosciences et Biotechnologies d'Aix-Marseille (ex-IBEB) (BIAM)
Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA))
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)
Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)
Direction de Recherche Fondamentale (CEA) (DRF (CEA))
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)
Source :
New Phytologist, New Phytologist, 2013, 197 (1), pp.65-72. ⟨10.1111/nph.12013⟩, New Phytologist, Wiley, 2013, 197 (1), pp.65-72. ⟨10.1111/nph.12013⟩
Publication Year :
2013
Publisher :
HAL CCSD, 2013.

Abstract

International audience; The classical view that the drought-related hormone ABA simply acts locally at the guard cell level to induce stomatal closure is questioned by differences between isolated epidermis and intact leaves in stomatal response to several stimuli. We tested the hypothesis that ABA mediates, in addition to a local effect, a remote effect in planta by changing hydraulic regulation in the leaf upstream of the stomata. By gravimetry, porometry to water vapour and argon, and psychrometry, we investigated the effect of exogenous ABA on transpiration, stomatal conductance and leaf hydraulic conductance of mutants described as ABA-insensitive at the guard cell level. We show that foliar transpiration of several ABA-insensitive mutants decreases in response to ABA. We demonstrate that ABA decreases stomatal conductance and down-regulates leaf hydraulic conductance in both the wildtype Col-0 and the ABA-insensitive mutant ost2-2. We propose that ABA promotes stomatal closure in a dual way via its already known biochemical effect on guard cells and a novel, indirect hydraulic effect through a decrease in water permeability within leaf vascular tissues. Variability in sensitivity of leaf hydraulic conductance to ABA among species could provide a physiological basis to the isohydric or anisohydric behaviour.

Details

Language :
English
ISSN :
0028646X and 14698137
Database :
OpenAIRE
Journal :
New Phytologist, New Phytologist, 2013, 197 (1), pp.65-72. ⟨10.1111/nph.12013⟩, New Phytologist, Wiley, 2013, 197 (1), pp.65-72. ⟨10.1111/nph.12013⟩
Accession number :
edsair.doi.dedup.....8954ad0a7a7f9e334e1240ac0da47db7
Full Text :
https://doi.org/10.1111/nph.12013⟩