外源钕减轻了重金属镉对菹草的毒害作用  

Toxic Effect of Cd^(2+) on Potamogeton crispus Alleviated by Exogenous Nd^(3+)

作　　者：王春涛[1] 施国新[1] 徐勤松[1] 武晓燕[1] 王学[1] 胡金朝[1] 马广岳[1] 

机构地区：[1]南京师范大学生命科学学院,南京江苏210097

出　　处：《中国稀土学报》2004年第6期821-824,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(30370083);江苏省教育厅自然科学基金(03KJB180062);江苏省重点实验室开放基金项目资助

摘　　要：研究了不同浓度钕对菹草镉胁迫的缓解效应。结果表明,单一镉(10mg·L-1)处理降低了菹草叶片抗氧化酶系超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)活性,丙二醛(MDA)含量升高,可溶性蛋白和叶绿素含量下降。用不同浓度钕处理后,明显减轻了这些症状,抗氧化酶活性均有所提高,与毒害对照相比,SOD、CAT及POD活性分别提高了14.0%～30.0%,8.8%～47.3%,4 6%～15 1%,并减轻了叶绿素和可溶性蛋白的降解,减缓了MDA的积累。随着钕浓度的进一步加大,缓解效应逐渐减弱,钕作用的最适浓度为10～15mg·L-1。The mitigation of toxic effect of Cd^(2+) on Potamogeton crispus L. by exogenous Nd^(3+) was studied. The results show that when treated with single 10 mg·L^(-1) Cd^(2+) for 5 d, the activity of antioxidase (SOD, CAT, POD) decreased, MDA content increased, chlorophyll and soluble protein content droped in P. crispus. When different concentrations of Nd^(3+) was added into the solution, SOD, POD and CAT activity enhances by 14.0%～30.0%, 8.8%～47.3%, 4.6%～15.1% respectively, the degradation of chlorophyll and protein was alleviated, and accumulation of MDA was reduced in comparison with single Cd^(2+) treatment. But the higher the Nd^(3+) concentration, the worse the relieved action. The optimum dose of Nd^(3+) to Cd^(2+) in P. crispus was ranged from 10～15 mg·L^(-1).

关 键 词：钕 重金属 镉 抗氧化酶系 稀土 

分 类 号：Q945[生物学—植物学]