Journal Article

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

Mohammad Mahbub Islam, Chiharu Tani, Megumi Watanabe-Sugimoto, Misugi Uraji, Md. Sarwar Jahan, Choji Masuda, Yoshimasa Nakamura, Izumi C. Mori and Yoshiyuki Murata

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 50, issue 6, pages 1171-1175
Published in print June 2009 | ISSN: 0032-0781
Published online May 2009 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcp066
Myrosinases, TGG1 and TGG2, Redundantly Function in ABA and MeJA Signaling in Arabidopsis Guard Cells

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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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

Journal Article.  2388 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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