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Background  MYB-CC transcription factors (TFs) genes have been demonstrated to be involved in the response to inorganic phosphate (Pi) starvation and regulate some Pi-starvation-inducible genes. However, their role in drought stress has not been investigated in bread wheat. In this study, the  TaMYBsm3  genes, including  TaMYBsm3-A ,  TaMYBsm3-B , and  TaMYBsm3-D , encoding MYB-CC TF proteins in bread wheat, were isolated to investigate the possible molecular mechanisms related to drought-tolerance in plants.    Results   TaMYBsm3-A ,  TaMYBsm3 - B , and  TaMYBsm3 - D  were mapped on chromosomes 6A, 6B, and 6D in wheat, respectively.  TaMYBsm3  genes belonged to MYB-CC TFs, containing a conserved MYB DNA-binding domain and a conserved coiled–coil domain.  TaMYBsm3-D  was localized in the nucleus, and the N-terminal region was a transcriptional activation domain. T aMYBsm3  genes were ubiquitously expressed in different tissues of wheat, and especially highly expressed in the stamen and pistil. Under drought stress, transgenic plants exhibited milder wilting symptoms, higher germination rates, higher proline content, and lower MDA content comparing with the wild type plants.  P5CS1 ,  DREB2A , and  RD29A  had significantly higher expression in transgenic plants than in wild type plants.    Conclusion   TaMYBsm3-A ,  TaMYBsm3 - B , and  TaMYBsm3 - D  were associated with enhanced drought tolerance in bread wheat. Overexpression of TaMYBsm3-D increases the drought tolerance of transgenic  Arabidopsis  through up-regulating  P5CS1 ,  DREB2A , and  RD29A .

MYB-CC transcription factor, TaMYBsm3, cloned from wheat is involved in drought tolerance