Transgenic expression of TaMYB2A confers enhanced tolerance to multiple abiotic stresses in Arabidopsis
文献类型: 外文期刊
第一作者: Mao, Xinguo
作者: Mao, Xinguo;Jia, Dongsheng;Li, Ang;Zhang, Hongying;Tian, Shanjun;Jia, Jizeng;Jing, Ruilian;Mao, Xinguo;Jia, Dongsheng;Li, Ang;Zhang, Hongying;Tian, Shanjun;Jia, Jizeng;Jing, Ruilian;Jia, Dongsheng;Zhang, Hongying;Zhang, Xiaoke
作者机构:
关键词: Phenotype;Physiological trait;Stress response;Transcription factor
期刊名称:FUNCTIONAL & INTEGRATIVE GENOMICS ( 影响因子:3.41; 五年影响因子:3.616 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: Osmotic stresses such as drought, salinity, and cold are major environmental factors that limit agricultural productivity. Transcription factors play essential roles in abiotic stress signaling in plants. Three TaMYB2 members were identified and designated TaMYB2A, TaMYB2B, and TaMYB2D based on their genomic origins. The cisregulatory elements in the promoter regions were compared, and their diverse expression patterns under different abiotic stress conditions were identified. TaMYB2A was further characterized because of its earlier response to stresses. Subcellular localization revealed that TaMYB2A localized in the nucleus. To examine the role of TaMYB2A under various environmental stresses, transgenic Arabidopsis plants carrying TaMYB2A controlled by the CaMV 35S promoter were generated and subjected to severe abiotic stress. TaMYB2A transgenics had enhanced tolerance to drought, salt, and freezing stresses, which were confirmed by the enhanced expressions of abiotic stress-responsive genes and several physiological indices, including decreased rate of water loss, enhanced cell membrane stability, improved photosynthetic potential, and reduced osmotic potential. TaMYB2A is a multifunctional regulatory factor. Its overexpression confers enhanced tolerance to multiple abiotic stresses while having no obvious negative effects on phenotype under well-watered and stressed conditions; thus, TaMYB2A has the potential for utilization in transgenic breeding to improve abiotic stress tolerances in crops.
分类号: Q78
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