Most of the experiments have indicated that vesicular-arbuscular mycorrhiza (VAM) was able to alter water relation of its host plants. This paper summarizes effects of VAM on morphology, metabolism and protective adaptation of host plants in the condition of drought stress. Mechanism that VAM can enhance resistance of drought stress in host plant may include many possible aspects: (1) VAM improves the properties of soil in rhisophere; (2) VAM enlarges root areas of host plants, and improves its efficiency of water absorption; (3) VAM enhances the absorption of P and other nutritional elements, and then improves nutritional status of host plant; (4) VAM activates defence system of host plant quickly; (5) VAM protects against oxidative damage generated by drought; (6) VAM affects the expression of genetic material.
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