首页|Dual function of Arabidopsis A TAF1 in abiotic and biotic stress responses
Dual function of Arabidopsis A TAF1 in abiotic and biotic stress responses
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NAC family genes encode plant-specific transcription factors involved in diverse biological processes.In this study,the Arabidopsis NAC gene ATAFI was found to be induced by drought,high-salinity,abscisic acid(ABA),methyl jasmonate,mechanical wounding,and Botrytis cinerea infection.Signifcant induction of ATAFI was found in an ABA-deficient mutant aba2 subjected to drought or high salinity,revealing an ABA-independent mechanism of expression.Arabidopsis ATAF1-overexpression lines displayed many altered phenotypes,including dwarfism and short primary roots.Furthermore,in vivo experiments indicate that ATAF1 is a bona fide regulator modulating plant responses to many abiotic stresses and necrotrophic-pathogen infection.Overexpression of ATAF1 in Arabidopsis increased plant sensitivity to ABA,salt,and oxidative stresses.Especially,ATAF1 overexpression plants,but not mutant lines,showed remarkably enhanced plant tolerance to drought.Additionally,ATAF1 overexpression enhanced plant susceptibility to the necrotrophic pathogen B.cinerea,but did not alter disease symptoms caused by avirulent or virulent strains of P.syringae pv tomato DC3000.Transgenic plants overexpressing ATAF1 were hypersensitive to oxidative stress,suggesting that reactive oxygen intermediates may be related to ATAF1-mediated signaling in response to both pathogen and abiotic stresses.
State Key Laboratory of Plant Genomics,National Center for Plant Gene Research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Datun Road,Beijing 100101,China
State Key Laboratory for Biocontrol,School of Life Science,Sun Yat-sen(Zhongshan)University,Guangzhou 510275,China
Wake Forest University School of Medicine,WinstonSalem,NC 27157,USA
国家自然科学基金Chinese Academy of SciencesChinese Academy of Sciences广东省自然科学基金
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