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WRKY transcription factors serve as antagonistic or synergistic regulators in a variety of abiotic stress responses in plants. Here, we show that CmWRKY1, a member of the group IIb WRKY family isolated from  Chrysanthemum morifolium , exhibits no transcriptional activation in yeast cells. The subcellular localization examination showed that CmWRKY1 localizes to the nucleus  in vivo . Furthermore,  CmWRKY1 -overexpressing transgenic lines exhibit enhanced dehydration tolerance in response to polyethylene glycol (PEG) treatment compared with wild-type plants. We further confirmed that the transgenic plants exhibit suppressed expression levels of genes negatively regulated by ABA, such as  PP2C ,  ABI1  and  ABI2 , and activated expression levels of genes positively regulated by ABA, such as  PYL2 ,  SnRK2 . 2 ,  ABF4 ,  MYB2 ,  RAB18 , and  DREB1A . Taken together, our results indicate that  CmWRKY1  plays an important role in the response to drought in chrysanthemum through an ABA-mediated pathway.

CmWRKY1 Enhances the Dehydration Tolerance of Chrysanthemum through the Regulation of ABA-Associated Genes