湖北林业科技

By the detection of the physiological and biochemical indexes of Myricaria laxiflora under different ecological environment of the original habitat and ex-situ protection, the ecological evolutionary response of M. laxiflora under dif- ferent ecological environments was determined. The results showed that the content of malondialdehyde (MDA) and the activity of polyphenol oxidase (ppo) were lower and weaker than those of the native population, and the content of solu- ble sugar, the activity of peroxidase (CAT), the activity of superoxide dismutase (SoD) and the activity of polyphenol oxi- dase (CAT) were higher than those of the native population . It can be seen that the stress resistance and disease resistance of the population in the original habitat were stronger . The ex-situ protective population can cope with environmental change by enhancing metabolism, increasing lignification degree, antioxidant defense function and stress adaptation . The ecological evolution of high temperature tolerance occurred after the reestablishment of the population of M. laxiflora , which could respond to environmental changes through physiological and biochemical adjustment.