Cd^(2+)污染对水花生生理生化及超微结构的影响

Toxic effects of Cd^(2+) pollution on the biochemical and physiological characters and ultrastructure of Alternanthera philoxeroides

1 引言 自1935年日本发生因镉中毒而导致的骨痛病以来,镉污染越来越受到人们的重视.有关其对人类及其它生物的危害已进行了很多研究[3,8,12].对水生植物而言,多数工作集中在对生理生化毒害[2,7]或对细胞结构损伤[7]的个别研究.笔者认为把生理生化变化与结构的破坏联系起来.讨论两者变化的相互关系,探讨其本质,才符合此过程的实际,则更具现实意义.但这方面的研究在国内还不多见.

By imitating different concentration Cd2+ polluted water environment, this paper dealt with the changes of some biochemical and physiological characters and the damage of ultrastructure in leaves of Altemanthera philoxe-roides. The result showed that SOD and POD activity first increased in the low concentration pollution and then decreased with the concentration of pollution raised. The content of chlorophyll, chlorophyll a/b value, CAT activity and the content of soluble protein all declined continually. With the concentration of pollution increased, the ultrastructure of cell nuclei, chloroplast and mitochondria became deformed, the permutation of structure inside disordered, swelled, membrane disrupted and vesiculated. The changes of some biochemical and physiological characters accorded with the damage of cell ultrastructure.