| With pot culture experiments simulating different soil drought, physiological mechanism of Sophoraviciifolia seeding to adapt to soil drought was studied. The result showed that water potential of Sophoraviciifolia decreased slowly in the early stage of stress and the soil water content and later water potential decreased sharply with time. It accumulated much osmotic regulating substances (soluble sugar, K+) to increase leaf water retaining capability and maintain growth turgor. It was not related to Pro change and siol water. Soluble sugar content decreased with soil water decrease and it could be injured under soil drought. SOD activity rose significantly and POD activity keptstable with stress time and CAT activity decreased. Change trend of CAT was not same as that of POD. It demonstrated that three-cell defense enzymes could cooperate to reduce lipid peroxidation degree, decrease cell wound, promote protoplasm membrane stability and maintain cell membrane integrity. Sophoraviciifolia has stronger drought resisting adaptability. |