盐胁迫对菠菜幼苗抗性生理的研究

本文采用砂培法，研究了不同浓度的盐胁迫对菠菜幼苗叶绿素、丙二醛和脯氨酸含量以及SOD、POD、CAT等抗氧化酶活性的影响。结果表明：Na^＋低浓度（10、20mg／L）胁迫时，叶绿素含量和抗氧化酶活性都高于对照组；而在高浓度（〉40mg／L）条件下，酶的活性下降、叶绿素含量降低；随Na^＋胁迫浓度的增大，丙二醛含量呈上升趋势，表明脂质过氧化程度在增加；脯氨酸含量表现出持续增加，增强植株对盐的抗性。

Physiological Effects of Different Concentration of Na Ion Stress on Spinacia oleracea Seedling

The different concentrations of Na^＋ making stress on Spinacia oleracea Linn of chlorophyll , MDA and proline and several antioxidant enzymes activity were studied by using the method of indoor sand - culture. The Results show that, When Na^＋ solution is in low concentration （10, 20 mg/L）, the chlorophyll content, SOD, POD and the CAT enzyme activity all are higher than the control group; When under high potency （ 〉 40mg/L） condition, enzyme system is out of balance due to the increasing oxygen, plant of resistance capability is lower, several enzymes and chlorophyll show a trend of decline; In the process of experiment, proline shows a increasing trend, improving resistance of the plant . MDA is also rising, and MDA is usually used for the measurement of lipid peroxidation.