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Involvement of NAC transcription factor NaNAC29 in Alternaria alternata resistance and leaf senescence in Nicotiana attenuata

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Plant Diversity 2021年第6期43卷 502-509页

作者： Lan Ma Rongping Li Luoyan Ma Na Song Zhen Xu Jinsong Wu Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of BotanyChinese Academy of SciencesLanhei Road 132650201KunmingChina University of Chinese Academy of Science Beijing 100049China

NAC-like,ACTIVATED BY AP3/PI(NAP)is a NAC transcription factor regulating leaf senescence in Arabidopsis *** wild tobacco Nicotiana attenuata,a nuclear localized NAC transcription factor NaNAC29 was identified to be highly elicited after inoculation of Alternaria alternata,a notorious necrotic fungus on tobacco *** NaNAC29 possesses similar tertiary structure to NAP with 60%amino acid ***,it remains unknown the role of NaNAC29 in plant defense responses to *** and leaf senescence in *** this paper,defensin-like protein 1(NaDLP1)was highly induced in *** after *** inoculation and bigger lesions were developed in NaDLP1-silenced ***,***-induced NaDLP1 was reduced by 76%in VIGS NaNAC29 plants and by 61%in JA deficient irAOC plants at 3 days post *** regulation of NaDLP1 expression by NaNAC29 was clearly independent on JA pathway,since exogenous methyl jasmonate treatment could not complement the induction levels of NaDLP1 in NaNAC29-silenced plants to the levels in WT ***,the expression of NaNAC29 was low expressed in young leaves but highly in senescent leaves and darktreated ***29-silenced plants,which were generated by virus-induced gene silencing(VIGS NaNAC29),showed delayed senescence *** addition,constitutive over-expression of NaNAC29 in *** could rescue the delayed-senescence phenotype of nap and caused precocious leaf senescence of wild-type Col-0 *** the data above demonstrate that NaNAC29 is a NAP homolog in *** participating in the defense responses to *** by regulation of a defensin protein NaDLP1 and promoting leaf senescence.

关键词： NaNAC29 defensin-like protein 1 Tobacco Brown spot disease Aging

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