Shandong Peanut Research Institute, Qingdao, China.
Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao, China.
J Exp Bot. 2023 Sep 13;74(17):5140-5152. doi: 10.1093/jxb/erad240.
Receptor-like kinases (RLKs) are the most important class of cell surface receptors, and play crucial roles in plant development and stress responses. However, few studies have been reported about the biofunctions of RLKs in leaf senescence. Here, we characterized a novel Arabidopsis RLK-encoding gene, SENESCENCE-RELATED RECEPTOR KINASE 1 (SENRK1), which was significantly down-regulated during leaf senescence. Notably, the loss-of-function senrk1 mutants displayed an early leaf senescence phenotype, while overexpression of SENRK1 significantly delayed leaf senescence, indicating that SENRK1 negatively regulates age-dependent leaf senescence in Arabidopsis. Furthermore, the senescence-promoting transcription factor WRKY53 repressed the expression of SENRK1. While the wrky53 mutant showed a delayed senescence phenotype as previously reported, the wrky53 senrk1-1 double mutant exhibited precocious leaf senescence, suggesting that SENRK1 functions downstream of WRKY53 in regulating age-dependent leaf senescence in Arabidopsis.
类受体激酶（RLKs）是细胞表面受体中最重要的一类，在植物发育和应激反应中发挥着关键作用。然而，关于 RLKs 在叶片衰老过程中的生物功能的研究却很少。在这里，我们对一个新的拟南芥 RLK 编码基因 SENESCENCE-RELATED RECEPTOR KINASE 1（SENRK1）进行了特征描述，该基因在叶片衰老过程中显著下调。值得注意的是，功能丧失的 senrk1 突变体表现出早期叶片衰老表型，而过表达 SENRK1 则显著延迟了叶片衰老，表明 SENRK1 负调控拟南芥的年龄依赖性叶片衰老。此外，促进衰老的转录因子 WRKY53 抑制了 SENRK1 的表达。先前的报道表明，wrky53 突变体表现出延迟的衰老表型，而 wrky53 senrk1-1 双突变体则表现出早熟的叶片衰老，表明 SENRK1 在调控拟南芥年龄依赖性叶片衰老中WRKY53 的下游发挥作用。
