文献类型： 外文期刊

作者： Xu, Zhongyang ¹ ; Gongbuzhaxi ¹ ; Wang, Changyou ¹ ; Xue, Fei ³ ; Zhang, Hong ¹ ; Ji, Wanquan ¹ ;

作者机构： 1.Northwest A&F Univ, Coll Agron, State Key Lab Crop Stress Biol Arid Areas, Yangling 712100, Shaanxi, Peoples R China

2.Qinghai Acad Agr & Forestry Sci, Xining 810016, Qinghai, Peoples R China

3.Shihezi Univ, Shihezi 832003, Xinjiang, Peoples R China

关键词： Wheat;NAC;Abiotic stress;Salt tolerance;Antioxidant system

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

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收录情况： SCI

摘要： Soil salinity is considered as one of the most severe abiotic stress factors, which limit plant growth and cause significant losses in crop yield. NAC transcription factors have been proven to play vital roles in abiotic stress signaling in plants. As a staple crop, wheat production is severely constrained by salt stress whereas only a few NAC genes have been characterized functionally. To promote the application of NAC genes in wheat improvement by genetic engineering, a NAC gene designated TaNAC29 was characterized in common wheat. Expression analysis showed that TaNAC29 gene was involved in response to salt, drought and ABA treatments. TaNAC29 protein displays transactivation activity. To determine its role, transgenic Arabidopsis overexpressing TaNAC29 controlled by the CaMV-35S promoter was generated and subjected to salt stress for morphological and physiological assays. Morphological analysis showed that transgenic plants had enhanced tolerance to salt stress, as indicated by improved physiological traits, including more green leaves, reduced H2O2 accumulation, strengthened cell membrane stability and higher SOD, POD, CAT and APX activities. Moreover, the transcript levels of stress-related genes were significantly higher in TaNAC29 overexpression line than those in WT under salt treatment. Taken together, our results demonstrate that TaNAC29 confers salt stress tolerance through reducing H2O2 accumulation and membrane damage by enhancing the antioxidant system, and participating in regulating the abiotic stress-responsive signaling pathway. (C) 2015 Elsevier Masson SAS. All rights reserved.