干旱胁迫对灰枣保护性酶活性及膜脂过氧化的影响

为研究干旱胁迫对灰枣保护性酶活性和膜脂过氧化作用的影响，以一年生灰枣嫁接苗为材料，在土壤不同水分条件下测定超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、过氧化物酶（POD）和丙二醛（MDA）含量及细胞膜透性的变化。结果表明：SOD、CAT、POD活性都大致呈现出先升高后降低的趋势，说明干旱胁迫下各种保护酶活性升高，但随着胁迫的加重，超出了植物可以忍耐的程度后，酶活性降低；同时，细胞膜受到伤害，细胞膜透性增加,作为膜脂过氧化产物的丙二醛含量也随着升高，电导率随之增强。

Influence of Drought Stress on Activity of Cell Protective Enzymes in Jujube

In order to study the effects of drought stress on activity of cell protective enzymes in Jujube, one-year-old Jujube grafting plant have been used as material. The protective enzymes, activities of superoxiede dismutase(SOD), catalse (CAT), peroxidase(POD), the content of MDA and the cellmembrane systems of mulberry were studied under different water conditions. The results showed that activity of SOD, POD and CAT in different treatment showed the same tendency of increasing firstly and then decreaseing, which demonstrated activity of cell protective enzymes was increased under drought stress, but with the heavier stress and exceed the endurance degree was then decreased. at the same time, the cellmembrane systems of mulberry were damaged and osmotic capability boosted, relative electric conductivity and MDA content increased.