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WRKY transcription factors play important roles in plant growth development, resistance and substance metabolism regulation. However, the exact function of the response to salt stress in plants with specific WRKY transcription factors remains unclear. In this research, we isolated a new WRKY transcription factor  DgWRKY5  from chrysanthemum.  DgWRKY5  contains two WRKY domains of WKKYGQK and two C 2 H 2  zinc fingers. The expression of  DgWRKY5  in chrysanthemum was up-regulated under various treatments. Meanwhile, we observed higher expression levels in the leaves contrasted with other tissues. Under salt stress, the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) enzymes in transgenic chrysanthemum were significantly higher than those in WT, whereas the accumulation of H 2 O 2 , O 2   −  and malondialdehyde (MDA) was reduced in transgenic chrysanthemum. Several parameters including root length, root length, fresh weight, chlorophyll content and leaf gas exchange parameters in transgenic chrysanthemum were much better compared with WT under salt stress. Moreover, the expression of stress-related genes  DgAPX ,  DgCAT ,  DgNCED3A ,  DgNCED3B ,  DgCuZnSOD ,  DgP5CS ,  DgCSD1  and  DgCSD2  was up-regulated in  DgWRKY5  transgenic chrysanthemum compared with that in WT. These results suggested that  DgWRKY5  could function as a positive regulator of salt stress in chrysanthemum.

Chrysanthemum WRKY gene DgWRKY5 enhances tolerance to salt stress in transgenic chrysanthemum