首页|Apple E3 ligase MdPUB23 mediates ubiquitin-dependent degradation of MdABI5 to delay ABA-triggered leaf senescence
Apple E3 ligase MdPUB23 mediates ubiquitin-dependent degradation of MdABI5 to delay ABA-triggered leaf senescence
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ABSCISIC ACID-INSENSITIVE5(ABI5)is a core regulatory factor that mediates the ABA signaling response and leaf senescence.However,the molecular mechanism underlying the synergistic regulation of leaf senescence by ABI5 with interacting partners and the homeostasis of ABI5 in the ABA signaling response remain to be further investigated.In this study,we found that the accelerated effect of MdABI5 on leaf senescence is partly dependent on MdbHLH93,an activator of leaf senescence in apple.MdABI5 directly interacted with MdbHLH93 and improved the transcriptional activation of the senescence-associated gene MdSAG18 by MdbHLH93.MdPUB23,a U-box E3 ubiquitin ligase,physically interacted with MdABI5 and delayed ABA-triggered leaf senescence.Genetic and biochemical analyses suggest that MdPUB23 inhibited MdABI5-promoted leaf premature senescence by targeting MdABI5 for ubiquitin-dependent degradation.In conclusion,our results verify that MdABI5 accelerates leaf senescence through the MdABI5-MdbHLH93-MdSAG18 regulatory module,and MdPUB23 is responsible for the dynamic regulation of ABA-triggered leaf senescence by modulating the homeostasis of MdABI5.
Fei Yang、Ling-Ling Zhao、Lai-Qing Song、Yuepeng Han、Chun-Xiang You、Jian-Ping An
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Apple Technology Innovation Center of Shandong Province,College of Horticulture Science and Engineering,Shandong Agricultural University,Tai-An,271018,Shandong,China
Yantai Academy of Agricultural Sciences,Yan-Tai 265599,Shandong,China
CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture,Wuhan Botanical Garden,Hubei Hongshan Laboratory,The Innovative Academy of Seed Design of Chinese Academy of Sciences,Wuhan 430074,China
国家自然科学基金Development Plan of the Youth Innovation Team of the Higher Education Institutions in Shandong ProvinceWuhan Botanical Garden Scientific Research Support Project
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