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SERKs serve as co-receptors for SYR1 to trigger systemin-mediated defense responses in tomato

Journal of Integrative Plant Biology 2024年第10期66卷 2273-2287页

作者： Hyewon Cho dain seo Minsoo Kim Bo Eun Nam Soyoun Ahn Minju Kang Geul Bang Choon-Tak Kwon Youngsung Joo Eunkyoo Oh Department of Life Sciences Korea UniversitySeoul 02841Korea Research Institute of Basic SciencesSeoul National UniversitySeoul 08826Korea School of Biological Sciences Seoul National UniversitySeoul 08826Korea Digital Omics Research Center Ochang Institute of Biological and Environmental ScienceKorea Basic Science InstituteCheongju 28119Korea Department of Smart Farm Science Kyung Hee UniversityYongin 17104Korea

Systemin, the first peptide hormone identified in plants, was initially isolated from tomato(Solanum lycopersicum) leaves. Systemin mediates local and systemic wound-induced defense responses in plants, conferring resistance to necrotrophic fungi and herbivorous insects. Systemin is recognized by the leucine-rich-repeat receptor-like kinase(LRRRLK) receptor SYSTEMIN RECEPTOR1(SYR1), but how the systemin recognition signal is transduced to intracellular signaling pathways to trigger defense responses is poorly understood. Here, we demonstrate that SERK family LRR-RLKs function as coreceptors for SYR1 to mediate systemin signal transduction in tomato. By using chemical genetic approaches coupled with engineered receptors, we revealed that the association of the cytoplasmic kinase domains of SYR1 with SERKs leads to their mutual trans-phosphorylation and the activation of SYR1, which in turn induces a wide range of defense responses. Systemin stimulates the association between SYR1 and all tomato SERKs(SlSERK1,SlSERK3A, and SlSERK3B). The resulting SYR1-SlSERK heteromeric complexes trigger the phosphorylation of TOMATO PROTEIN KINASE 1B(TPK1b), a receptor-like cytoplasmic kinase that positively regulates systemin responses. Additionally,upon association with SYR1, SlSERKs are cleaved by the Pseudomonas syringae effector HopB1, further supporting the finding that SlSERKs are activated by systemin-bound SYR1. Finally, genetic analysis using Slserk mutants showed that SlSERKs are essential for systemin-mediated defense responses. Collectively, these findings demonstrate that the systeminmediated association of SYR1 and SlSERKs activates defense responses against herbivorous insects.

关键词： LRR-RLK peptide SERK SYR1 systemin

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