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- Title
MPK9 and MPK12 function in SA-induced stomatal closure in Arabidopsis thaliana.
- Authors
Khokon, Md. Atiqur Rahman; Salam, Mohammad Abdus; Ye, Wenxiu; Hossain, Mohammad Anowar; Okuma, Eiji; Nakamura, Yoshimasa; Murata, Yoshiyuki; Jammes, Fabien; Mori, Izumi C.; Kwak, June M.
- Abstract
Salicylic acid (SA) induces stomatal closure sharing several components with abscisic acid (ABA) and methyl jasmonate (MeJA) signaling. We have previously shown that two guard cell-preferential mitogen-activated protein kinases (MAPKs), MPK9 and MPK12, positively regulate ABA signaling and MeJA signaling inArabidopsis thaliana. In this study, we examined whether these two MAPKs are involved in SA-induced stomatal closure using genetic mutants and a pharmacological, MAPKK inhibitor. Salicylic acid induced stomatal closure inmpk9andmpk12single mutants but not inmpk9 mpk12double mutants. The MAPKK inhibitor PD98059 inhibited SA-induced stomatal closure in wild-type plants. Salicylic acid induced extracellular reactive oxygen species (ROS) production, intracellular ROS accumulation, and cytosolic alkalization in thempk9,mpk12, andmpk9 mpk12mutants. Moreover, SA-activated S-type anion channels in guard cells of wild-type plants but not in guard cells ofmpk9 mpk12double mutants. These results imply that MPK9 and MPK12 are positive regulators of SA signaling in Arabidopsis guard cells.
- Subjects
MITOGEN-activated protein kinase genetics; SALICYLIC acid; ARABIDOPSIS thaliana genetics
- Publication
Bioscience, Biotechnology & Biochemistry, 2017, Vol 81, Issue 7, p1394
- ISSN
0916-8451
- Publication type
Article
- DOI
10.1080/09168451.2017.1308244