数字农科院2.0

Rice RuBisCO activase promotes the dark-induced leaf senescence by enhancing the degradation of filamentation temperature-sensitive H

文献类型： 外文期刊

作者： Zhang, Yanli;Dong, Guojun;Wu, Xiaoyue;Chen, Fei;Ruan, Banpu;Jiang, Yaohuang;Zhang, Ying;Liu, Lu;Yuan, Yao-Wu;Wu, Limin;Wei, Jian;Qian, Qian;Yu, Yanchun

作者机构：

关键词： rice (Oryza sativa L.);RuBisCO activase (RCA);dark-induced senescence (DIS);filamentation temperature-sensitive H (OsFtsH1);chloroplast

期刊名称： PLANT JOURNAL

ISSN： 0960-7412

年卷期： 2025 年 121 卷 4 期

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Leaf senescence is a complex process that is triggered by many developmental and environmental factors. However, the mechanisms regulating leaf senescence remain unclear. Here, we revealed that rice ribulose-1,5-bisphosphate carboxylase/oxygenase activase (RCA) promotes the onset of basal dark-induced senescence. RCA was mainly expressed in the leaves, and its expression level quickly declined under dark conditions. Furthermore, rca mutant plants presented a prolonged leaf longevity phenotype in the dark, whereas overexpression of the large isoform of RCA (RCAL), not small isoform (RCAS), in rice and Arabidopsis accelerated leaf senescence. Filamentation temperature-sensitive H (OsFtsH1), a zinc metalloprotease, interacts with RCAL and RCAS and presents a higher binding efficiency to RCAL than RCAS in darkness. Furthermore, we found that RCAL promotes 26S proteasome-mediated degradation of OsFtsH1 protein, which can be inhibited by protease inhibitor MG132. Consequently, OsFtsH1 loss-of-function mutants exhibit accelerated leaf senescence, whereas OsFtsH1-overexpressing plants display delayed senescence. Collectively, our findings highlight the significant role of RCAL isoform in regulating leaf senescence under dark conditions, particularly through enhancing the degradation of OsFtsH1.

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