%0 Journal Article
%T Toxic effects of Hg2+, Cd2+ and Cu2+ on cell membrane system of Cabomba caroliniana A. Gray<br>汞、镉、铜污染对鱼草细胞膜系统的毒害作用
%A GU Wei
%A SHI Guo-xin
%A CHAO Jian-guo
%A WU Qinan
%A ZHANG Chao-ying
%A DU Kai-he
%A XU Qin-song
%A <br>谷巍
%A 施国新
%A 巢建国
%A 吴启南
%A 张超英
%A 杜开和
%A 徐勤松
%J 应用生态学报
%D 2008
%I 
%X By the observation with electron- and confocal laser scanning microscopy and the determination of physiological and biochemical reactions, the toxic effects of Hg2+, Cd2+ and Cu2+ on the cell membrane system of Cabomba caroliniana A. Gray were investigated. The results showed that under the actions of the three heavy metal ions, the contents of reactive oxygen species (ROS) and malondialdehyde (MDA) in C. caroliniana leaf cells increased, activities of protective enzymes were in disorder, and lipid peroxidation happened. The cell membrane was damaged, membrane permeability increased, and plasmolysis occurred. Meanwhile, the chloroplast swelled or even disintegrated. The excitement of photosynthetic pigments on thylakoids membrane by light was inhibited, and the auto-fluoresent intensity was decreased. The cristae of mitochondria swelled and decreased, mitochondria membrane was damaged, and nuclear membrane was broken. The effects of Hg2+, Cd2+ and Cu2+ on the cell membrane system of C. caroliniana showed a definite dose-effect correlation, and the stability of membrane system played a key role in the resistance of C. caroliniana to the toxic effects of heavy metals. C. caroliniana was sensitive to Hg2+, and the lethal concentration of Hg2+ was ranged from 0.3 to 0.5 mg L(-1). C. caroliniana had relatively higher endurance to Cd2+ and Cu2+, and could be used as the resistant plant for biological control.
%K 鱼草
%K Hg2
%K Cd2
%K Cu2
%K 污染
%K 膜系统
%K 铜污染
%K 细胞
%K 膜系统
%K 毒害作用
%K effects
%K system
%K cell
%K membrane
%K 抗性植物
%K 生物防治
%K 致死浓度
%K 敏感
%K 激发过程
%K 重金属胁迫
%K 稳定性
%K 量效应关系
%K 存在
%K 影响
%K 膜破裂
%K 破损
%K 线粒体嵴
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=F3E6C6283264F9712695CB97F6BB1808&yid=67289AFF6305E306&vid=2A8D03AD8076A2E3&iid=94C357A881DFC066&sid=70024E0C77AE588F&eid=CF89D3C02791C82E&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=3&reference_num=24