Effects of arbuscular mycorrhizal fungi alkaline phosphatase activities onHippophae rhamnoides drought-resistance under water stress conditions

The effects of arbuscular mycorrhizal fungi al kaline phosphatase (ALP) act ivities on the drought-resistance of Hippophae rhamnoides under water stres s have been studied using histochemical techniques. The result shows in the mycorrhizae that total hyphae and functional hyphae form the base for the active hyphae, and amounts follow the order total hyphae>functional hyphae> active hyphae. Active hyphae play an important role in the biomass accumula tion of the hosts; the hyphae with phosphatase activity (ALP) have a positi ve and strong effect on H. rhamnoides growth and its drought-resistance, an d the rise of ALP is related to an increase in the fresh weight of the host trees, and a reduction of wilting. The direct participation of ALP in the P nutrient exchange host trees can improve the nutrient and water condition s, and raise their drought-resistance.