Cd对槐叶苹的生理影响及外源La、Ca的缓解效应比较  

Physiological effect of cadmium on Saluinia natans and camparison of the detoxication of exogenous lanthanum and calcium against it

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

机构地区：[1]南京师范大学生命科学学院,江苏南京210097

出　　处：《广西植物》2005年第2期156-160,共5页Guihaia

基　　金：国家自然科学基金(30370083);江苏省教育厅自然科学基金(12003600JSJB131)

摘　　要：研究了Cd2+毒害对低等水生植物槐叶苹的生理影响及外源La、Ca的缓解效应。结果表明,Cd2+污 染时,槐叶苹叶片出现褪绿、叶缘拳卷并伴有烂斑和根状叶断离现象。随着Cd2+浓度的升高,叶片的叶绿素 含量、SOD、CAT、POD活性先升后降,但各指标达到最大值时的Cd2+浓度各不相同,以POD对应的最高。可 溶性蛋白含量及丙二醛(MDA)产量分别呈现出下降和上升趋势,且可溶性蛋白含量受Cd2+的影响更大。外 源La和Ca均能缓解Cd2+对槐叶苹叶片叶绿素含量、可溶性蛋白含量的降低和MDA的积累,对保护酶系统 的影响存在较大差异。The paper mainly studied the effects of La and Ca on low aquatic plant Saluinia natans growing in the solution containing different concentration of Cd .The results showed that the leaves of Saluinia natans lost green color,leaf margin twisted following with spoil spots and root-like leaf broke when Cd polluting. With the increasing of Cd concentration,the chlorophyll content,SOD,CAT and POD activities of the leaves increased first and decreased afterwords ,but the Cd concentration was different when they reached maxima respectively,it was the highest when POD activity reached maxima. The soluble protein and MDA contents appeared decrease and increase trend respectively and the toxic effect of Cd on the soluble protein content was heavier than that on the MDA content. Exogenous La and Ca could alleviate the decrease of chlorophyll and soluble protein contents and the accumulation of MDA caused by Cd stress. The effect of La and Ca on protective enzyme system was much different.

关 键 词：生理影响 缓解效应 LA 外源 CA 可溶性蛋白含量 Cd^2+ 丙二醛(MDA) 叶片叶绿素含量 槐 POD活性 保护酶系统 水生植物 上升趋势 SOD CAT 最大值 浓度 

分 类 号：Q945.78[生物学—植物学] S63[农业科学—蔬菜学]