Effects of Grafting on the Improvement of Heat Tolerance and Antioxidant Abilities in Leaves of Chrysanthemum

Using Artemisia frigida and Artemisia scoparia as root stocks,grafted chrysanthemum were created. The membrane permeability,O-·2production rate,and activities of superoxide dismutase(SOD) ,peroxidase(POD) ,catalase(CAT) ,ascrobate peroxidase(APX) and contents of soluble protein in leaves of the cutting seedlings and grafted seedlings of chrysanthemum were studied under heat stress. The results showed that grafted seedlings had lower membrane permeability and O-·2production rate,while SOD,CAT and APX activities and soluble protein contents were higher compared with those in the cutting seedlings. However,there was no significant difference in O-·2production rate and activities of antioxidant enzymes between the grafted seedlings with different root stocks. The leaf curling,wilting,yellowing were alleviated in grafted seedling than those in cutting seedlings under heat stress. It suggested that grafting could improve the heat tolerance of chrysanthemum.