NaCl胁迫对甜高粱幼苗保护酶活性等生理特性的影响

Effects of NaCl stress on activities of protective enzyme and physiological characteristics in sweet sorghum seedlings

采用不同浓度NaCl溶液(100 mmol/L、200 mmol/L)胁迫处理甜高粱幼苗,测定了叶片中叶绿素含量、脯氨酸含量及三种保护酶活性等生理指标。结果表明:100 mmol/L和200 mmol/L处理的甜高粱幼苗质膜相对透性、脯氨酸和丙二醛含量升高;可溶性蛋白和叶绿素含量降低;保护酶系统中叶片超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性均升高,且在100 mmol/L浓度处理下达到最大,而过氧化物酶(POD)活性呈先升高再降低趋势。NaCl胁迫对甜高粱幼苗的一些生理特性产生一定影响。

A study was made to investigate the effects of different concentrations of NaCI （100 mmol/L and 200 mmol/L ） on content of chlorophyll and other physiological characteristics in sweet sorghum seedlings. The results showed that under different concentrations of NaCl, the content of proline （Pro） and malondialdehyde （MDA） increased continuously, and the same as plasma membrane permeability of sweet sorghum seedlings. However, the content of chlorophyll and soluble protein deceased gradually under NaCl treatment. The activities of superoxide dismutase （SOD） and catalase （CAT） in sweet sorghum leaves increased, of which both reached the maximum under 100 mmol/L NaCl treatment. The activities of peroxidase （POD） was in a trend of increase first and then decrease. So the physiological characteristics of sweet sorghum seedlings were obviously affected by the two treatments of different NaCl concentration..