MPK9 and MPK12 function in SA-induced stomatal closure in arabidopsis thaliana

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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 in Arabidopsis 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 in mpk9 and mpk12 single mutants but not in mpk9 mpk12 double 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 the mpk9, mpk12, and mpk9 mpk12 mutants. Moreover, SA-activated S-type anion channels in guard cells of wild-type plants but not in guard cells of mpk9 mpk12 double mutants. These results imply that MPK9 and MPK12 are positive regulators of SA signaling in Arabidopsis guard cells.

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Khokon, M. A. R., Salam, M. A., Jammes, F., Ye, W., Hossain, M. A., Okuma, E., … Murata, Y. (2017). MPK9 and MPK12 function in SA-induced stomatal closure in arabidopsis thaliana. Bioscience, Biotechnology and Biochemistry, 81(7), 1394–1400. https://doi.org/10.1080/09168451.2017.1308244

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