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Upon recognition of microbes, pattern recognition receptors (PRRs) activate pattern-triggered immunity. FLAGELLIN SENSING2 (FLS2) and BRASSINOSTEROID INSENSITIVE1-ASSOCIATED KINASE1 (BAK1) form a typical PRR complex that senses bacteria. Here, we report that the kinase activity of the malectin-like receptor-like kinase STRESS INDUCED FACTOR 2 (SIF2) is critical for Arabidopsis (Arabidopsis thaliana) resistance to bacteria by regulating stomatal immunity. SIF2 physically associates with the FLS2-BAK1 PRR complex and interacts with and phosphorylates the guard cell SLOW ANION CHANNEL1 (SLAC1), which is necessary for abscisic acid (ABA)-mediated stomatal closure. SIF2 is also required for the activation of ABA-induced S-type anion currents in Arabidopsis protoplasts, and SIF2 is sufficient to activate SLAC1 anion channels in Xenopus oocytes. SIF2-mediated activation of SLAC1 depends on specific phosphorylation of Ser 65. This work reveals that SIF2 functions between the FLS2-BAK1 initial immunity receptor complex and the final actuator SLAC1 in stomatal immunity. © 2020 American Society of Plant Biologists. All rights reserved.


Ching Chan, Dario Panzeri, Eiji Okuma, Kadri Tõldsepp, Ya-Yun Wang, Guan-Yu Louh, Tzu-Chuan Chin, Yu-Hung Yeh, Hung-Ling Yeh, Shweta Yekondi, You-Huei Huang, Tai-Yuan Huang, Tzyy-Jen Chiou, Yoshiyuki Murata, Hannes Kollist, Laurent Zimmerli. STRESS INDUCED FACTOR 2 Regulates Arabidopsis Stomatal Immunity through Phosphorylation of the Anion Channel SLAC1. The Plant cell. 2020 Jul;32(7):2216-2236

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PMID: 32327536

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