Sequential activation of strigolactone and salicylate biosynthesis promotes leaf senescence

文献类型： 外文期刊

第一作者： Jing, Yexing

作者： Jing, Yexing;Yang, Ziyi;Bai, Wanqing;Yang, Ruizhen;Zhang, Yunwei;Sun, Jiaqiang;Yang, Zongju;Zhang, Yanjun;Zhang, Kewei

作者机构：

关键词： salicylic acid (SA); SPL9/15; SPX1/2; strigolactones (SLs); WRKY75

期刊名称：NEW PHYTOLOGIST （ 影响因子：9.4； 五年影响因子：10.5 ）

ISSN： 0028-646X

年卷期： 2024 年 242 卷 6 期

页码：

收录情况： SCI

摘要： Leaf senescence is a complex process strictly regulated by various external and endogenous factors. However, the key signaling pathway mediating leaf senescence remains unknown. Here, we show that Arabidopsis SPX1/2 negatively regulate leaf senescence genetically downstream of the strigolactone (SL) pathway. We demonstrate that the SL receptor AtD14 and MAX2 mediate the age-dependent degradation of SPX1/2. Intriguingly, we uncover an age-dependent accumulation of SLs in leaves via transcriptional activation of SL biosynthetic genes by the transcription factors (TFs) SPL9/15. Furthermore, we reveal that SPX1/2 interact with the WRKY75 subclade TFs to inhibit their DNA-binding ability and thus repress transcriptional activation of salicylic acid (SA) biosynthetic gene SA Induction-Deficient 2, gating the age-dependent SA accumulation in leaves at the leaf senescence onset stage. Collectively, our new findings reveal a signaling pathway mediating sequential activation of SL and salicylate biosynthesis for the onset of leaf senescence in Arabidopsis.

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