镉硫交互对东南景天抗氧化酶活性的影响  

Effects of Sulfur and Cadmium Interactions on Antioxidant Enzyme Activity in Hyperaccumulator-Sedum alfredii Hance

作　　者：李会合[1] 

机构地区：[1]重庆文理学院,重庆永川402160

出　　处：《水土保持学报》2011年第5期103-106,共4页Journal of Soil and Water Conservation

基　　金：教育部科学技术研究重点项目(210184);国家自然科学基金项目(306330046)

摘　　要：通过营养液培养试验研究不同硫镉水平对超积累东南景天抗氧化酶活性的影响。结果表明,在增施镉水平下东南景天叶片的MDA含量随着硫水平增加显著降低,Cd0水平下S2处理显著降低MDA含量达12.4%。相反,东南景天叶片的MDA含量随着镉水平的提高显著增加18.4%～137.7%。镉硫交互对超积累东南景天叶片抗氧化酶活性有显著影响。超积累东南景天叶片SOD活性随着硫、镉水平的增加而增加,以S3>S2>S1,Cd100>Cd10>Cd0。增施硫显著提高Cd10和Cd100水平下东南景天叶片POD活性。在S1,S2水平下,增加Cd水平东南景天叶片POD活性显著增加,POD活性以Cd10>Cd100>Cd0。超积累东南景天叶片CAT活性随着硫水平增加而增加8.9%～21.3%,CAT活性随着Cd水平的增加而显著增加,增幅以S1和S2水平下较大。随着S,Cd水平的增加东南景天叶片的APX活性显著增加。镉硫交互对4种抗氧化酶的效应以APX>CAT>POD>SOD。Effects of sulfur and cadmium interactions on antioxidant enzyme activity in hyperaccumulator-Sedum alfredii Hance were investigated in hydroponic culture.The contents of MDA in leaf were decreased with sulfur application under three cadmium levels,significantly decreased by 12.4% in Cd0 and S2 treatment.On the contrary,the contents of MDA were significantly increased from 18.4% to 137.7% with increasing cadmium level.There were significant effects of sulfur and cadmium interactions on antioxidant enzyme activity in hyperaccumulator-Sedum alfredii Hance.With increasing of sulfur and cadmium level,the activity of SOD were significantly increased and were in the order of S3S2S1 and Cd100Cd10Cd0.The activities of POD in leaf of hyperaccumulator-Sedum alfredii Hance were increased with increasing S application in Cd10 and Cd100 treatment.Under S1and S2 levels,the activities of POD were enhanced with increasing cadmium level and were in the order of Cd10Cd100Cd0.The activities of CAT were increased from 8.9% to 21.3% with application S.Increasing cadmium level enhanced CAT activity and the effects were better under S1 and S2 level.The activities of APX were significantly increased by application of sulfur and cadmium.Effects of sulfur and cadmium interaction on antioxidant enzyme activity were in the order of APXCATPODSOD.

关 键 词：超积累东南景天 镉 硫 抗氧化酶 

分 类 号：X171.5[环境科学与工程—环境科学] X173