水分胁迫对梨树叶片质膜氧化还原系统的影响

摘要

The basic physiological index of redox system of l eaf plasmic membrane were studied on two varieties of pear trees, P. bretschne ideri cv. Zao Su and P.betuloefolia. Bqe. The result showed that water st ress could increase ATPase activity, reduce both the oxidation rate of NADH and NADPH and the deoxidation rate of EDTA-Fe 3+ and Fe(CN)6 (3-) o f pl asmic membrane. When water stress occurred, the oxidation rate of GSH and vitami n C (Vc) obviously increased, which indicated that GSH and Vc could be as electr on donor of redox system of plasmic membrane besides NADH and NADPH in the leave s of young crisp pear trees. Probably under water stress condition, GSH and Vc c ould replace NADH and NADPH, acting as electron donor of redox system of plasmic membrane.%对水分胁迫下早酥梨和杜梨两种梨树叶片的质膜氧化还原系统进行了研究.结果表明,水分胁迫使梨幼树叶片质膜ATPase活性提高,质膜NADH(还原性辅酶Ⅰ)和NADPH(还原性辅酶Ⅱ)的氧化速率及Fe(CN)6 (3-)和EDTA-Fe 3+ 的还原速率降低,GSH(谷胱甘肽)和Vc(抗坏血酸)的氧化速率明显增加,表明除了NADH 和NADPH外,GSH和Vc也可以作为早酥梨幼树叶片质膜氧化还原系统的电子供体.进一步而言 ,在水分胁迫条件下,GSH和Vc可能是代替NADH和NADPH的质膜氧化还原系统的电子供体.