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CKL2 mediates the crosstalk between abscisic acid and brassinosteroid signaling to promote swift growth recovery after stress in Arabidopsis

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Journal of Integrative Plant Biology 2023年第1期65卷 64-81页

作者： Xiaoyun Zhao Tianren Zhang Li Bai Shuangshuang Zhao Yan Guo Zhen Li State Key Laboratory of Plant Physiology and Biochemistry College of Biological Sciences China Agricultural UniversityBeijing 100193 China Key Laboratory of Plant Stress Life Science College Shandong Normal UniversityJinan 250014 China

Plants must adapt to the constantly changing environment. Adverse environmental conditions trigger various defensive responses, including growth inhibition mediated by phytohormone abscisic acid(ABA). When the stress recedes, plants must transit rapidly from stress defense to growth recovery, but the underlying mechanisms by which plants switch promptly and accurately between stress resistance and growth are poorly understood. Here, using quantitative phosphoproteomics strategy, we discovered that early ABA signaling activates upstream components of brassinosteroid(BR) signaling through CASEIN KINASE 1-LIKE PROTEIN 2(CKL2).Further investigations showed that CKL2 interacts with and phosphorylates BRASSINOSTEROID INSENSITIVE1(BRI1), the main BR receptor, to maintain the basal activity of the upstream of BR pathway in plants exposed to continuous stress conditions. When stress recedes, the elevated phosphorylation of BRI1 by CKL2 contributes to the swift reactivation of BR signaling, which results in quick growth recovery. These results suggest that CKL2 plays a critical regulatory role in the rapid switch between growth and stress resistance. Our evidence expands the understanding of how plants modulate stress defense and growth by integrating ABA and BR signaling cascades.

关键词： abscisic acid brassinosteroids CKL2 growth recovery stress

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