The Over-Expression of Two R2R3-MYB Genes, PdMYB2R089 and PdMYB2R151 , Increases the Drought-Resistant Capacity of Transgenic Arabidopsis .

The genes in plants play an essential role in the drought-responsive signaling pathway. Plenty of S21 and S22 subgroup genes in have been implicated in dehydration conditions, yet few have been covered in terms of the role of the S21 and S22 subgroup genes in poplar under drought. and genes, respectively belonging to the S21 and S22 subgroups of NL895 ( × cv. 'Nanlin895'), were selected based on the previous expression analysis of poplar genes that are responsive to dehydration. The regulatory functions of two target genes in plant responses to drought stress were studied and speculated through the genetic transformation of . and could promote the closure of stomata in leaves, lessen the production of malondialdehyde (MDA), enhance the activity of the peroxidase (POD) enzyme, and shorten the life cycle of transgenic plants, in part owing to their similar conserved domains. Moreover, could strengthen root length and lateral root growth. These results suggest that and genes might have the potential to improve drought adaptability in plants. In addition, could significantly improve the seed germination rate of transgenic , but not. This finding provides a clue for the subsequent functional dissection of S21 and S22 subgroup genes in poplar that is responsive to drought.