盐胁迫对三个高羊茅品种膜脂过氧化及耐盐性的影响

Effect of Saline Coerce on Lipid Peroxidation and Salt Tolerance of Three Tall Fescue Cultivars

以高羊茅品种"雅典娜"、"金太阳"和"美洲虎4号"种子为试材,测定分析了其在盐碱土和正常土壤上发芽70d后叶片中保护酶活性和丙二醛(MDA)、叶绿素及可溶性蛋白质的含量。结果表明:盐碱土上的"雅典娜"、"金太阳"和"美洲虎4号"叶片的过氧化物酶(POD)活性分别比在正常土上的升高了10.43%、12.68%和61.83%,超氧化物歧化酶(SOD)活性分别比正常土升高了33.96%、41.70%和16.35%,过氧化氢酶(CAT)活性比正常土上的升高了6.18%、106.34%和2.62%;MDA含量比正常土上增加了56.46%、33.56%和65.21%;叶绿素含量分别比正常土下降了35.35%、27.08%和36.59%;可溶性蛋白质含量比正常土降低了23.04%、7.39%和23.49%。其中"金太阳"在盐碱土上受到的膜脂过氧化程度较轻,叶绿素和可溶性蛋白质的含量下降较少,耐盐性较好。

Taking ‘Athena’,‘Golden sun’and ‘Jaguar 4’as materials,the leaf protective enzymes activity,MDA,chlorophyll content and soluble protein content were determined under normal soil and saline-alkali soil after 70 days germination.The results showed that the POD activity of‘Athena’,‘Golden sun’and‘Jaguar 4’under the saline-alkali soil were higher 10.43%,12.68%and 61.83%than that under the normal soil.Likewise,the SOD activity were higher33.96%,41.70%and 16.35%,the CAT activity was higher 6.18%,106.34%and 2.62%;the MDA content was higher56.46%,33.56%and 65.21%;the chlorophyll content was decreased 35.35%,27.08%and 36.59%;the soluble protein content was decreased 23.04%,7.39%and 23.49%.Among‘Athena’,‘Golden sun’and‘Jaguar 4’,the degree of lipid peroxidation of‘Golden sun’in saline-alkali soil were lighter,the chlorophyll content and the soluble protein content decreasing was fewer,and it had the higher salt tolerance.