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《ACTA BOTANICA SINICA》 2000-04
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Ultrastructural Study of Leaf Cells Damaged from Hg~(2+) and Cd~(2+) Pollution in Hydrilla verticillata

SHI Guo_Xin, DU Kai_He, XIE Kai_Bin, DING Xiao_Yu, CHANG Fu_Chen, CHEN Guo_Xiang [WT6BZ](Department of Biology, Nanjing Normal University, Nanjing 210097, China)  
Hydrilla verticillata (L. f.) Royle was cultivated in water medium polluted with Hg 2+ and Cd 2+ of different gradient concentrations for 3 days and 6 days respectively. Leaves of H. verticillata lost their green color gradually with the increasing pollutant concentration. Ultrastructural observation showed, at its early stage, dispersion of dictyosomes, disintegration after swelling of endoplasmic reticulum, swelling or vesiculation of thylakoids of chloroplasts and cristae of mitochondria and condensation of chromatin of nucleus. More serious damage was shown in the plant cells with heavier pollution, such as disappearance of ribosomes, agglutination of chromatin of nucleus, dispersion of nucleolus, disruption of nuclear membrane, disintegration of chloroplasts and mitochondria, collapse of plasmodesmata due to plasmolysis, focal dissociation of cell wall and eventually cells death. The results indicated that Hg 2+ and Cd 2+ might injure all the membranous and non_membranous structures of cells, though there existed different degrees of endurance of cell structures to the poison. The lethal concentration of Hg 2+ to cell of H. verticillata ranged from 1 to 2 mg/L, and that of Cd 2+ ranged from 2 to 3 mg/L.
【Fund】: 国家自然科学基金资助项目 ( 3 9770 0 46)&&
【CateGory Index】: Q945
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