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The leaf senescence-promoting transcription factor AtNAP activates its direct target gene CYTOKININ OXIDASE 3 to facilitate senescence processes by degrading cytokinins

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Molecular Horticulture 2021年第1期1卷 60-71页

作者： Youzhen Hu Bin Liu Huazhong Ren Liping Chen Christopher B.Watkins Su-Sheng Gan Plant Biology Section School of Integrative Plant ScienceCornell UniversityIthacaNew York 14853USA Current address:College of Food Science Shihezi UniversityXinjiang 832000China College of Horticulture China Agriculture UniversityBeijing 100193China Current address:Department of Plant Genomics Centre for Research in Agricultural Genomics(CRAG)CSIC-IRTA-UAB-UBBellaterraSpain College of Agriculture and Biotechnology Zhejiang UniversityHangzhou 310058China Horticulture Section School of Integrative Plant ScienceCornell UniversityIthacaNew York 14853USA

Cytokinins(CKs)are a class of adenine-derived plant hormones that plays pervasive roles in plant growth and development including cell division,morphogenesis,lateral bud outgrowth,leaf expansion and *** as a“fountain of youth”prolongs leaf longevity by inhibiting leaf senescence,and therefore must be catabolized for senescence to ***,a senescence-specific transcription factor has a key role in promoting leaf *** role of AtNAP in regulating CK catabolism is *** we report the identification and characterization of AtNAP-AtCKX3(cytokinin oxidase 3)module by which CKs are catabolized during leaf senescence in *** AtNAP,AtCKX3 is highly upregulated during leaf *** AtNAP is chemically induced AtCKX3 is co-induced;and when AtNAP is knocked out,the expression of AtCKX3 is *** physically binds to the cis element of the AtCKX3 promoter to direct its expression as revealed by yeast one-hybrid assays and in planta *** of the atckx3 knockout lines have higher CK concentrations and a delayed senescence phenotype compared with those of *** contrast,leaves with inducible expression of AtCKX3 have lower CK concentrations and exhibit a precocious senescence phenotype compared with *** research reveals that AtNAP transcription factor˗AtCKX3 module regulates leaf senescence by connecting two antagonist plant hormones abscisic acid and CKs.

关键词： ABA ABA-cytokinin crosstalk Aging Arabidopsis Cytokinin metabolism leaf longevity Plant hormone Senescence-associated genes(SAGs)

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A positive feedback regulatory loop,SAAtNAP-SAG202/SARD1-ICS1-SA,in SA biosynthesis involved in leaf senescence but not defense response

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Molecular Horticulture 2022年第1期2卷 206-220页

作者： Yaxin Wang Bin Liu Youzhen Hu Su-Sheng Gan Sections of Plant Biology School of Integrative Plant ScienceCornell UniversityIthacaNew York 14853USA Nobell Foods South San FranciscoCalifornia 94080USA College of Food Science Shihezi UniversityXinjiang 832000China

Salicylic acid(SA)is an important plant hormone that regulates defense responses and leaf *** is imperative to understand upstream factors that regulate genes of SA ***202/SARD1 is a key regulator for isochorismate synthase 1(ICS1)induction and SA biosynthesis in defense *** regulatory mechanism of SA biosynthesis during leaf senescence is not well *** we show that AtNAP,a senescence-specific NAC family transcription factor,directly regulates a senescence-associated gene named SAG202 as revealed in yeast one-hybrid and in planta *** overexpreesion of AtNAP and SAG202 lead to high levels of SA and precocious senescence in *** knockout mutants of sag202 and ics1 have markedly reduced SA levels and display a significantly delayed leaf senescence ***,SA positively feedback regulates AtNAP and *** research has uncovered a unique positive feedback regulatory loop,SA-AtNAP-SAG202-ICS1-SA,that operates to control SA biosynthesis associated with leaf senescence but not defense response.

关键词： Aging Biotic stress Feedback regulation leaf longevity Salicylic acid(SA) Senescence-associated gene(SAG)

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