对苹果梨和杜梨两种梨树叶片的质膜氧化还原系统进行了研究。研究结果表明, 干旱使梨幼树叶片质膜NADH(还原性辅酶Ⅰ)和NADPH(还原性辅酶Ⅱ)的氧化速率及Fe(CN)63-和EDTA-Fe3+的还原速率降低。在干旱胁迫时, GSH(谷胱甘肽)和Vc(抗坏血酸)的氧化速率却明显增加, 表明除了NADH和NADPH外, GSH和Vc也可以作为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。
The basic physiological indcag of redox system of plasmic membrane were studied on two variety of pear, Pyrus ussuriensis Var. Ovoidea and P. betuloafolia. Bqe. The result shaved that drought could reduce both the oxidation rate of NADH and NADPH and the deoxidation rate of EDTA-Fe3+ and Fe(CN)63- of plasmic membrane. When water stress occurred, the oxidation rate of GSH and vitamin C(Vc) obviously increased, which indicated that GSH and Vc could be as electron donor of redox system of plasmic membrane besides NADH and NADPH.Probably under the water stress condition, GSH and Vc could replace NADH and NADPH, acting as electron donor of redox system of plasmic membrane.
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