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Plant and Cell Physiology Advance Access originally published online on July 22, 2008
Plant and Cell Physiology 2008 49(9):1396-1401; doi:10.1093/pcp/pcn106
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© The Author 2008. 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

Roles of RCN1, Regulatory A Subunit of Protein Phosphatase 2A, in Methyl Jasmonate Signaling and Signal Crosstalk between Methyl Jasmonate and Abscisic Acid

Naoki Saito1, Shintaro Munemasa1, Yoshimasa Nakamura1, Yasuaki Shimoishi1, 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: E-mail, muta{at}cc.okayama-u.ac.jp; Fax, +81-86-251-8310.


  Abstract

Methyl jasmonate (MeJA) as well as abscisic acid (ABA) induces stomatal closure with their signal crosstalk. We investigated the function of a regulatory A subunit of protein phosphatase 2A, RCN1, in MeJA signaling. Both MeJA and ABA failed to induce stomatal closure in Arabidopsis rcn1 knockout mutants unlike in wild-type plants. Neither MeJA nor ABA induced reactive oxygen species (ROS) production and suppressed inward-rectifying potassium channel activities in rcn1 mutants but not in wild-type plants. These results suggest that RCN1 functions upstream of ROS production and downstream of the branch point of MeJA signaling and ABA signaling in Arabidopsis guard cells.

Keywords: Abscisic acid - Arabidopsis thaliana - Guard cells - K+ channel - Methyl jasmonate - Reactive oxygen species

Abbreviations: [Ca2+]cyt, cytosolic calcium concentration; IKin, inward-rectifying K+ channel currents; MeJA, methyl jasmonate; OA, okadaic acid; PP1, protein phosphatase 1; PP2A, protein phosphatase 2A; ROS, reactive oxygen species.

(Received June 11, 2008; Accepted July 18, 2008)
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[Abstract] [Full Text] [PDF]


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