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GABA signalling modulates stomatal opening to enhance plant water use efficiency and drought resilience
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GABA signalling modulates stomatal opening to enhance plant water use efficiency and drought resilience
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Journal Article
GABA signalling modulates stomatal opening to enhance plant water use efficiency and drought resilience
2021
Overview
The non-protein amino acid γ-aminobutyric acid (GABA) has been proposed to be an ancient messenger for cellular communication conserved across biological kingdoms. GABA has well-defined signalling roles in animals; however, whilst GABA accumulates in plants under stress it has not been determined if, how, where and when GABA acts as an endogenous plant signalling molecule. Here, we establish endogenous GABA as a bona fide plant signal, acting via a mechanism not found in animals. Using
Arabidopsis thaliana
, we show guard cell GABA production is necessary and sufficient to reduce stomatal opening and transpirational water loss, which improves water use efficiency and drought tolerance, via negative regulation of a stomatal guard cell tonoplast-localised anion transporter. We find GABA modulation of stomata occurs in multiple plants, including dicot and monocot crops. This study highlights a role for GABA metabolism in fine tuning physiology and opens alternative avenues for improving plant stress resilience.
GABA accumulates during stress in plants but how, where and when GABA acts is not clear. Here the authors show that GABA production in
Arabidopsis
guard cells reduces stomatal opening and transpirational water loss, thereby improving water use efficiency.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 96/109
/ 96/35
/ 96/63
/ 96/95
/ Abscisic Acid - pharmacology
/ Adaptation, Physiological - genetics
/ Animals
/ Arabidopsis Proteins - genetics
/ Arabidopsis Proteins - metabolism
/ Chloride Channels - genetics
/ Chloride Channels - metabolism
/ Droughts
/ gamma-Aminobutyric Acid - metabolism
/ Gene Expression Regulation, Plant
/ Glutamate Decarboxylase - genetics
/ Glutamate Decarboxylase - metabolism
/ Green Fluorescent Proteins - genetics
/ Green Fluorescent Proteins - metabolism
/ Humanities and Social Sciences
/ Plant Stomata - drug effects
/ Plant Transpiration - drug effects
/ Plant Transpiration - genetics
/ Recombinant Fusion Proteins - genetics
/ Recombinant Fusion Proteins - metabolism
/ Science
/ Stomata
