数字农科院2.0

CLE42 delays leaf senescence by antagonizing ethylene pathway in Arabidopsis

文献类型： 外文期刊

作者： Zhang, Yi;Tan, Shuya;Gao, Yuhan;Kan, Chengcheng;Wang, Hou-Ling;Yang, Qi;Xia, Xinli;Ishida, Takashi;Sawa, Shinichiro;Guo, Hongwei;Li, Zhonghai

作者机构：

关键词： Arabidopsis thaliana;CLE;EBF;EIN3;ethylene;leaf senescence

期刊名称： NEW PHYTOLOGIST

ISSN： 0028-646X

年卷期： 2022 年

页码：

收录情况： SCIE（2022版）

摘要： Leaf senescence is the final stage of leaf development and is influenced by numerous internal and environmental factors. CLE family peptides are plant-specific peptide hormones that regulate various developmental processes. However, the role of CLE in regulating Arabidopsis leaf senescence remains unclear. Here, we found that CLE42 is a negative regulator of leaf senescence by using a CRISPR/Cas9-produced CLE mutant collection. The cle42 mutant displayed earlier senescence phenotypes, while overexpression of CLE42 delayed age-dependent and dark-induced leaf senescence. Moreover, application of the synthesized 12-amino-acid peptide (CLE42p) also delayed leaf senescence under natural and dark conditions. CLE42 and CLE41/44 displayed functional redundancy in leaf senescence, and the cle41 cle42 cle44 triple mutant displayed more pronounced earlier senescence phenotypes than any single mutant. Analysis of differentially expressed genes obtained by RNA-Seq methodology revealed that the ethylene pathway was suppressed by overexpressing CLE42. Moreover, CLE42 suppressed ethylene biosynthesis and thus promoted the protein accumulation of EBF, which in turn decreased the function of EIN3. Accordingly, mutation of EIN3/EIL1 or overexpression of EBF1 suppressed the earlier senescence phenotypes of the cle42 mutant. Together, our results reveal that the CLE peptide hormone regulates leaf senescence by communicating with the ethylene pathway.

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