WRKY1, a negative regulator in stomata ABA signalling

 

WRKY1 regulates stomatal movement in drought-stressed Arabidopsis thaliana

by Qiao Z., Li C.-L., Zhang W. (2016)

Zhu Qiao

Chun-Long Li

Wei Zhang

in Plant Molecular Biology 91: 1-13 -doi:10.1007/s11103-016-0441-3 – 

http://link.springer.com/article/10.1007%2Fs11103-016-0441-3

Abstract

A key response of plants to moisture stress is stomatal closure, a process mediated by the phytohormone abscisic acid (ABA). Closure is affected by changes in the turgor of the stomatal guard cell.

The transcription factor WRKY1 is a part of the regulatory machinery underlying stomatal movements, and through this, in the plant’s response to drought stress.

The loss-of-function T-DNA insertion mutant wrky1 was particularly sensitive to ABA, with respect to both ion channel regulation and stomatal movements, and less sensitive to drought than the wild type.

Complementation of the wrky1 mutant resulted in the recovery of the wild type phenotype. The WRKY1 product localized to the nucleus, and was shown able to bind to the W-box domain in the promoters of MYB2, ABCG40, DREB1A and ABI5, and thereby to control their transcription in response to drought stress or ABA treatment.

WRKY1 is thought to act as a negative regulator in guard cell ABA signalling.

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Published by

Willem Van Cotthem

Honorary Professor of Botany, University of Ghent (Belgium). Scientific Consultant for Desertification and Sustainable Development.

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