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Plant and Cell Physiology Advance Access published online on May 11, 2009
Plant and Cell Physiology, 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 e-mail: journals.permissions@oxfordjournals.org

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,*

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

*Corresponding author: Prof. Yoshiyuki MURATA. Graduate School of Natural Science and Technology, Okayama University, 1-1-1 Tsushima-naka, Okayama 700-8530, Japan. Email: muta{at}cc.okayama-u.ac.jp, Phone: ++-81-86-251-8310, 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 ABA and 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 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

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