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Plant and Cell Physiology Advance Access originally published online on May 11, 2009
Plant and Cell Physiology 2009 50(6):1171-1175; doi:10.1093/pcp/pcp066
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

Myrosinases, TGG1 and TGG2, Redundantly Function in ABA and MeJA Signaling in Arabidopsis Guard Cells

Mohammad Mahbub Islam1, Chiharu Tani1, Megumi Watanabe-Sugimoto1, Misugi Uraji1, Md. Sarwar Jahan1, Choji Masuda1, Yoshimasa Nakamura1, Izumi C. Mori2 and Yoshiyuki Murata1,*

1Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama, 700-8530 Japan
2Research Institute for Bioresources, Okayama University, Kurashiki, Okayama, 710-0046 Japan

*Corresponding author: E-mail, muta{at}cc.okayama-u.ac.jp; Fax, +81-86-251-8388.


  Abstract

Thioglucoside glucohydrolase (myrosinase), TGG1, is a strikingly abundant protein in Arabidopsis guard cells. We investigated responses of tgg1-3, tgg2-1 and tgg1-3 tgg2-1 mutants to abscisic acid (ABA) and methyl jasmonate (MeJA) to clarify whether two myrosinases, TGG1 and TGG2, function during stomatal closure. ABA, MeJA and H2O2 induced stomatal closure in wild type, tgg1-3 and tgg2-1, but failed to induce stomatal closure in tgg1-3 tgg2-1. All mutants and wild type showed Ca2+-induced stomatal closure and ABA-induced reactive oxygen species (ROS)production. A model is discussed in which two myrosinases redundantly function downstream of ROS production and upstream of cytosolic Ca2+ elevation in ABA and MeJA signaling in guard cells.

Keywords: Abscisic acid - Arabidopsis thaliana - Guard cells - Methyl jasmonate - Myrosinase - Reactive oxygen species

Abbreviations: MeJA, methyl jasmonate; ICa channels, plasma membrane Ca2 + (non-selective cation) channels; ROS, reactive oxygen species.

(Received April 1, 2009; Accepted May 5, 2009)
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