Roles of RCN1, regulatory A subunit of protein phosphatase 2A, in methyl jasmonate signaling and signal crosstalk between methyl jasmonate and abscisic acid.
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.
Saito
Naoki
N
Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan.
Munemasa
Shintaro
S
Nakamura
Yoshimasa
Y
Shimoishi
Yasuaki
Y
Mori
Izumi C
IC
Murata
Yoshiyuki
Y
D000040:Abscisic Acid / Q000378:metabolism*; D000085:Acetates / Q000378:metabolism*; D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D003517:Cyclopentanes / Q000378:metabolism*; D019319:Okadaic Acid / Q000494:pharmacology; D054883:Oxylipins / Q000378:metabolism*; D054046:Plant Stomata / Q000187:drug effects / Q000378:metabolism; D024661:Potassium Channels, Inwardly Rectifying / Q000378:metabolism; D054648:Protein Phosphatase 2 / Q000235:genetics / Q000378:metabolism*; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction
D000085:Acetates; D029681:Arabidopsis Proteins; D003517:Cyclopentanes; D054883:Oxylipins; D024661:Potassium Channels, Inwardly Rectifying; D017382:Reactive Oxygen Species; D019319:Okadaic Acid; D000040:Abscisic Acid; C072239:methyl jasmonate; D054648:Protein Phosphatase 2; C478612:RCN1 protein, Arabidopsis