期刊
EMBO REPORTS
卷 21, 期 7, 页码 -出版社
WILEY
DOI: 10.15252/embr.201948967
关键词
ABA biosynthesis; DOF transcription factor; floral organ abscission; leaf senescence; ROS scavenging
资金
- National Natural Science Foundation of China [31500236, U1738107, 31600684, 31971172, 31570859]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA04020202-15, XDA04020415]
- China Manned Space Flight Technology Project
Leaf senescence is a highly complex developmental process that is tightly controlled by multiple layers of regulation. Abscisic acid (ABA) and reactive oxygen species (ROS) are two well-known factors that promote leaf senescence. We show here that the transcription factor CDF4 positively regulates leaf senescence. Constitutive and inducible overexpression of CDF4 accelerates leaf senescence, while knockdown of CDF4 delays it. CDF4 increases endogenous ABA levels by upregulating the transcription of the ABA biosynthesis genes 9-cis-epoxycarotenoid dioxygenase 2, 3 (NCED2, 3) and suppresses H2O2 scavenging by repressing expression of the catalase2 (CAT2) gene. NCED2, 3 knockout and CAT2 overexpression partially rescue premature leaf senescence caused by CDF4 overexpression. We also show that CDF4 promotes floral organ abscission by activating the polygalacturonase PGAZAT gene. Based on these results, we propose that the levels of CDF4, ABA, and ROS undergo a gradual increase driven by their interlinking positive feedback loops during the leaf senescence and floral organ abscission processes.
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