【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。更多还原

【Abstract】 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.更多还原