Abstract
As an important transcription factor family, DREB transcription factors play important roles in response to abiotic stresses. In this study, we identified wheat DREB genes at genome-level, and characterized the functions of TaDREB genes. Totally, there are 210 TaDREB genes, which can be divided into 6 subgroups. Some of these genes display tissue-specific expression patterns. Among them, the expression of three TaDREB3 homoeologous genes is induced by abiotic stresses. Meanwhile, as alternatively spliced genes, they generate three isoforms respectively. Transcripts I and II encode DREB proteins, while transcript III does not generate DREB proteins. Transgenic Arabidopsis over-expressing TaDREB3-AI displayed enhanced resistance to drought, salt and heat stresses. The physical indexes and the expression of stress-related genes further verified the functions in response to abiotic stresses. Our results lay a foundation for further study of wheat DREB genes. Especially, our findings indicate that TaDREB3 genes can be used for crop genetic improvement.
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