Cd^(2+)、Hg^(2+)复合污染下金鱼藻的细胞膜脂过氧化和抗氧化酶活性的变化  

Changes of Cell Membrance Lipid Peroxidation and Activities of Antioxidant Enzyme Systems of Ceratophyllum demersum L. in Combinative Pollution of Cd^(2+) and Hg^(2+)

作　　者：常福辰[1] 施国新[1] 丁小余[1] 解凯彬[1] 王建军[1] 丁静[1] 

机构地区：[1]南京师范大学生命科学学院,南京210097

出　　处：《南京师大学报（自然科学版）》2002年第1期44-48,共5页Journal of Nanjing Normal University(Natural Science Edition)

基　　金：国家自然科学基金 (39770 0 46 );江苏省自然科学基金资助项目 (BK9710 70 )

摘　　要：研究了不同浓度Cd2 + 、Hg2 + 以及二者共同胁迫对金鱼藻O 、MDA含量和抗氧化酶系统的影响 .实验结果表明 :Cd2 + 、Hg2 + 共同作用所产生的毒性效应大于单一Cd2 + 、Hg2 + ,表现为协同作用 .随着Cd2 + 、Hg2 + 浓度的增加 ,O 2 、MDA含量先升后降 ,MDA峰值较O 2 滞后 ;SOD、POD活性先升后降 ,表现为植物的一种抗性机制 ;CAT活性持续下降 ,在清除活性氧自由基过程中作用不明显 .The paper deals with the effects of Cd 2+ ?Hg 2+ and their interaction on O  2?MDA and antioxidant enzyme systems of Ceratophyllum demersum L. .The results showed the synergic function of combination of Cd 2+ ?Hg 2+ , as the toxicity of combined pollution is heavier than those of single pollution.With the increasing of the concentration of Cd 2+ ?Hg 2+ ,accumulation of O  2?MDA were stimulated in lower level but decreased afterwards.The crest value of O  2 appeared earlier than MDA.The activities of SOD,POD also raised first and droped then,which may be regarded as a protecting function of plants.The activities of CAT reduced all along and had little effect in antioxidation.

关 键 词：抗氧化酶 金鱼藻 CD HG 复合污染 细胞膜脂过氧化 毒害机理 酶活性 

分 类 号：X503.23[环境科学与工程—环境工程]