Cr^(6+)、As^(3+)污染对黑藻叶细胞伤害的超微结构研究

Ultrastructural Study of Leaf Cells Damaged from Cr^(6+)and As^(3+) Pollution in Hydrilla verticillata

电镜观察发现 ,黑藻 (Hydrillaverticillata(L .F .)Royle)叶细胞遭受Cr6+ 、As3 + 毒害初期 ,高尔基体消失 ,内质网膨胀后解体 ,叶绿体中的类囊体和线粒体中的脊突膨胀 ,核中染色质凝集 .随着叶细胞毒害程度的加重 ,核仁消失 ,核膜破裂 ,叶绿体和线粒体解体 ,质壁分离使胞间连丝拉断 ,最后细胞死亡 .结果表明 :Cr6+ 、As3 +

Ultrastructural observation showed,leaf cells damaged from Cr 6+ and As 3+ pollution in H. Verticillata at early stage,dispersion of dictyosomes,disintegration after swelling of endoplasmic reticulum,swelling of thylakoids of chloroplast and cristae of mitochondria and condensation of chromatin of nucleus.More serious damage was shown in the plant cells with heavier pollution,such as dispersion of nucleolus,disruption of nuclear membrane,disintegration of chloroplasts and mitochondia,collapse of plasmodesmata due to plasmolysis and eventually cells death.The results indicated that Cr 6+ and As 3+ might injure all the membranous and non-membranous structure of cells.