Transcription factor CDF4 promotes leaf senescence and floral organ abscission by regulating abscisic acid and reactive oxygen species pathways in Arabidopsis
Transcription factor CDF4 promotes leaf senescence and floral organ abscission by regulating abscisic acid and reactive oxygen species pathways in Arabidopsis
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DOI：
10.15252/embr.201948967
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Weiming Cai
中科院分区：
文献类型：
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作者：
Peipei Xu;Haiying Chen;Weiming Cai
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.
