Melatonin delays leaf senescence of Chinese flowering cabbage by suppressing ABFs-mediated abscisic acid biosynthesis and chlorophyll degradation
文献类型： 外文期刊
作者： Tan, Xiao-Li 1 ; Fan, Zhong-qi 1 ; Kuang, Jian-fei 1 ; Lu, Wang-jin 1 ; Reiter, Russel J. 2 ; Lakshmanan, Prakash 3 ;
作者机构： 1.South China Agr Univ, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangdong Prov Key Lab Postharvest Sci Fruits & V, Minist Educ,Coll Hort,Engn Res Ctr Southern Hort, Guangzhou, Guangdong, Peoples R China
2.UT Hlth Sci Ctr, Dept Cellular & Struct Biol, San Antonio, TX USA
3.Guangxi Acad Agr Sci, Minist Agr, Key Lab Sugarcane Biotechnol & Genet Improvement, Nanning, Peoples R China
4.Guangxi Acad Agr Sci, Sugarcane Res Inst, Guangxi Key Lab Sugarcane Genet Improvement, Nanning, Peoples R China
5.Guangdong Food & Drug Vocat Coll, Guangzhou, Guangdong, Peoples R China
6.Zhejiang Univ, Zhejiang Prov Key Lab Hort Plant Integrat Biol, Dept Hort, Zijingang Campus, Hangzhou, Zhejiang, Peoples R China
关键词： abscisic acid; Chinese flowering cabbage; leaf senescence; melatonin; transcriptional regulation
期刊名称：JOURNAL OF PINEAL RESEARCH （ 影响因子：13.007； 五年影响因子：12.936 ）
ISSN： 0742-3098
年卷期： 2019 年 67 卷 1 期
页码：
收录情况： SCI
摘要： Melatonin and abscisic acid (ABA) play contrasting roles in regulating leaf senescence in plants. The molecular mechanism underlying the interaction between melatonin and ABA involved in leaf senescence, however, remains poorly defined. Herein, we found that exogenous application of melatonin delayed the senescence of Chinese flowering cabbage, accompanied by reduced expression of chlorophyll catabolic and ABA biosynthetic genes, and a lower endogenous ABA level. Significantly, three nucleus-localized transcriptional activators BrABF1, BrABF4, and BrABI5 were identified, and their expressions were repressed by melatonin. In vitro and in vivo binding experiments revealed that BrABF1, BrABF4, and BrABI5 activated the transcription of a series of ABA biosynthetic and chlorophyll catabolic genes by physically binding to their promoters. Moreover, transient over-expression of BrABF1, BrABF4, and BrABI5 in tobacco leaves induced ABA accumulation and promoted chlorophyll degradation by upregulating tobacco ABA biosynthetic and chlorophyll catabolic genes, resulting in the accelerated leaf senescence. These effects were significantly attenuated by melatonin treatment. Our findings suggest that melatonin-mediated inhibition of leaf senescence involves suppression of ABFs-mediated ABA biosynthesis and chlorophyll degradation. Unraveling of the molecular regulatory mechanism of leaf senescence controlled by ABA and melatonin expands our understanding of the regulation of this phenomenon and offers potentially more effective molecular breeding strategies for extending the shelf-life of Chinese flowering cabbage.
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