Improvement of wheat drought and salt tolerance by expression of a stress- inducible transcription factorGmDREB of soybean (Glycinemax)
GAO Shiqing1, XU Huijun1, CHENG Xianguo2, CHEN Ming1, XU Zhaoshi1, LI Liancheng1, YE Xingguo1, DU Lipu1, HAO Xiaoyan1 & MA Youzhi11. Key Laboratory of Crop Genetics and Breeding, Ministry of Agricul-ture/Institute of Crop Science, Chinese Academy of AgriculturaSciences, Beijing 100081, China; 2. Ministry of Agriculture Key Laboratory of Plant Nutrition and NutrienCycling, Institute of Agricultaral Resources and Regional PlanningChinese Academy of Agricultural Sciences, Beijing 100081, China
Under stress conditions such as droughthigh-salinity and low-temperature, the transcription factorof DREB (dehydration responsive element binding proteins)improved efficiently stress resistance by regulating the ex-pression of its downstream genes with various environmentastress resistance in plants. GmDREB gene (GenBank Acces-sion No. AF514908) encoding a stress-inducible transcriptionfactor was cloned by screening a cDNA library of Glycinemax cv. Jinong 27 with yeast one-hybrid method. GmDREBgene was 910 bp in length and encoded 174 amino acids con-taining a conserved AP2/EREBP DNA-binding domain of 58amino acids. Two conserved functional amino acids, valineand glutamic acid, were located on the 14th and the 19thamino acid residues in the conserved structural domain. Analkaline amino acid region (KKR) related to a nuclear local-ization signal was at the N-terminal, while an acidic aminoacid region (DDD) related to trans-activation was at theC-terminal. Plant expression vectors were constructed andtransformed into wheat by bombardment. In total, 13 trans-genic plants with Ubi::GmDREB and 11 transgenic plantswith rd29A::GmDREB were identified from 103 regenerationplants by molecular analysis. The drought and salt tolerancesof T1 transgenic lines with Ubi::GmDREB orrd29A::GmDREB were demonstrated to be improved ascompared to wild type. The result also suggested that bothUbiquitin and rd29A promoters could effectively drive theexpression of the GmDREB gene and enhance drought andsalt tolerance of T1 plants.
【CateGory Index】： S512.1