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STRESS INDUCED FACTOR 2 Regulates Arabidopsis Stomatal Immunity through Phosphorylation of the Anion Channel SLAC1

SIF2 is critical for Arabidopsis (Arabidopsis thaliana) resistance to bacteria by regulating stomatal immunity, belongs to the FLS2/BAK1 immunity receptor complex, and phosphorylates the anion channel SLAC1. Abstract Upon recognition of microbes, pattern recognition receptors (PRRs) activate pattern...

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Published in:The Plant cell 2020-07, Vol.32 (7), p.2216-2236
Main Authors: Chan, Ching, Panzeri, Dario, Okuma, Eiji, Tõldsepp, Kadri, Wang, Ya-Yun, Louh, Guan-Yu, Chin, Tzu-Chuan, Yeh, Yu-Hung, Yeh, Hung-Ling, Yekondi, Shweta, Huang, You-Huei, Huang, Tai-Yuan, Chiou, Tzyy-Jen, Murata, Yoshiyuki, Kollist, Hannes, Zimmerli, Laurent
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container_end_page 2236
container_issue 7
container_start_page 2216
container_title The Plant cell
container_volume 32
creator Chan, Ching
Panzeri, Dario
Okuma, Eiji
Tõldsepp, Kadri
Wang, Ya-Yun
Louh, Guan-Yu
Chin, Tzu-Chuan
Yeh, Yu-Hung
Yeh, Hung-Ling
Yekondi, Shweta
Huang, You-Huei
Huang, Tai-Yuan
Chiou, Tzyy-Jen
Murata, Yoshiyuki
Kollist, Hannes
Zimmerli, Laurent
description SIF2 is critical for Arabidopsis (Arabidopsis thaliana) resistance to bacteria by regulating stomatal immunity, belongs to the FLS2/BAK1 immunity receptor complex, and phosphorylates the anion channel SLAC1. Abstract 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.
doi_str_mv 10.1105/tpc.19.00578
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Abstract 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. 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ispartof The Plant cell, 2020-07, Vol.32 (7), p.2216-2236
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subjects Abscisic Acid - metabolism
Abscisic Acid - pharmacology
Animals
Arabidopsis - microbiology
Arabidopsis - physiology
Arabidopsis Proteins - genetics
Arabidopsis Proteins - immunology
Arabidopsis Proteins - metabolism
Disease Resistance - physiology
Female
Histone Deacetylases - genetics
Histone Deacetylases - immunology
Histone Deacetylases - metabolism
Membrane Proteins - genetics
Membrane Proteins - immunology
Membrane Proteins - metabolism
Mutation
Oocytes - physiology
Phosphorylation
Plant Diseases - immunology
Plant Diseases - microbiology
Plant Immunity - drug effects
Plant Stomata - immunology
Plant Stomata - metabolism
Plants, Genetically Modified
Protein Kinases - metabolism
Protein Serine-Threonine Kinases - metabolism
Repressor Proteins - genetics
Repressor Proteins - immunology
Repressor Proteins - metabolism
Serine - metabolism
Xenopus
title STRESS INDUCED FACTOR 2 Regulates Arabidopsis Stomatal Immunity through Phosphorylation of the Anion Channel SLAC1
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