The NAC056 transcription factor confers freezing tolerance by positively regulating expression of CBFs and NIA1 in Arabidopsis  

作　　者：Peipei Xu Wei Ma Huafeng Feng Weiming Cai 

机构地区：[1]Laboratory of Photosynthesis and Environment,CAS Center for Excellence in Molecular Plant Sciences,Shanghai Institute of Plant Physiology and Ecology,Chinese Academy of Sciences,No.300 Fenglin Road,Shanghai 200032,China [2]State Key Laboratory of NBC Protection for Civilian,Beijing 102205,China [3]Department of Food Science,College of Hospitality Management,Shanghai Business School,Shanghai 200235,China [4]These authors contributed equally to this article

出　　处：《Plant Communications》2024年第7期251-260,共10页植物通讯（英文）

基　　金：supported by the National Natural Science Foundation of China(grant nos.32371293,32171232,31500236,and 31570859);the Natural Science Foundation of Shanghai(grant no.22ZR1469500).

摘　　要：Freezing stress can seriously affect plant growth and development,but the mechanisms of these effects and plant responses to freezing stress require further exploration.Here,we identified a NAM,ATAF1/2,and CUC2(NAC)-family transcription factor(TF),NAC056,that can promote freezing tolerance in Arabidopsis.NAC056 mRNA levels are strongly induced by freezing stress in roots,and the nac056 mutant exhibits compromised freezing tolerance.NAC056 acts positively in response to freezing by directly promoting key C-repeat-binding factor(CBF)pathway genes.Interestingly,we found that CBF1 regulates nitrate assimilation by regulating the nitrate reductase gene NIA1 in plants;therefore,NAC056–CBF1–NIA1 form a regulatory module for the assimilation of nitrate and the growth of roots under freezing stress.In addition,35S::NAC056 transgenic plants show enhanced freezing tolerance,which is partially reversed in the cbfs triple mutant.Thus,NAC056 confers freezing tolerance through the CBF pathway,mediating plant responses to balance growth and freezing stress tolerance.

关 键 词：CBFs freezing tolerance NAC transcription factor nitrate assimilation root growth 

分 类 号：Q94[生物学—植物学]