Abstract:

In this study, using Dongkui seedlings as test materials, the effects of Bacillus subtilis(BS), salicylic acid(SA), and brassinolactone·indoleacetic acid·gibberellic acid(BHG) induced treatment on the resistance of twig blight disease and growth of Chinese bayberry were investigated. The results showed that when compared with the control group, the disease index was significantly lower under BS and BHG treatment, and their relative induction effects were 35.44% and 27.16%, respectively. Under the induction of BS and BHG, both leaf length and leaf area were higher than the control, with the leaf area increased by 8.82% and 8.42%, respectively. Under the treatment of all three inducers, the chlorophyll content increased to varying degrees. Under the treatment of BS, the content of chlorophyll a and chlorophyll b were significantly higher than the control. The activities of antioxidant enzymes including SOD, POD and CAT were significantly increased under the treatment of three inducers. Among them, the induction effects of BS and BHG were more significant, and their corresponding MDA content was significantly lower than the control. In summary, this study identified two inducers including BS and BHG that can induce resistance to twig blight disease, which can provide important basis for the prevention and control of twig blight disease in Chinese bayberry in the future.

Key words: Chinese bayberry, twig blight disease, inducers