Competition Binding of CmbHLH1L and CmNLP6/7L to CmbHLH63 Modulates Leaf Senescence in Chrysanthemum.

ABSTRACT: Leaf senescence impacts the quality, productivity and post-harvest performance of crops and ornamental plants. However, the underlying molecular mechanisms governing this process remain poorly understood. In this study, we identified CmbHLH63 as a 'brake signal' of leaf senescence in chrysanthemum and elucidated its critical regulatory role within the CmbHLH1L-CmbHLH63-CmNLP6/7L complex. CmbHLH63 promotes leaf senescence, while it is downregulated during this process. Notably, CmbHLH63 lacks intrinsic transcriptional regulatory activity; however, the expression of a majority of genes was repressed in plants overexpressing CmbHLH63. Further investigation revealed that this repression is achieved through recruiting the transcriptional repressor CmbHLH1L. We further found that CmNLP6/7L, a tr

SUBMITTER: Yang Y 

PROVIDER: S-EPMC12665071 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature