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《Rural Eco-environment》 2001-02
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Effect of Cd~(2+) on Antioxidase System and Ultrastructure of Ottelia alismoides (L.)Pers. Leaves.

Xu Qinsong et al(College of Life Science,Nanjing Normal University,NANJING 210097):Rural Eco Environment,2001,17(2):30~34  
Investigation was made of effect of simulated Cd 2+ pollution on the antioxidase system and ultrastructure of the cells of Ottelia alismoides(L.)Pers.leaves,mainly chloroplasts,mitochondria and cell nucleus. It was found that with increase in the stress,superoxide dismutase(SOD)activity and soluble protein content decreased drastically,while malonyl(MDA)increased;and that the activity of peroxidase(POD)and catalase(CAT)peaked at 0 1mg/L of the pollutant and declined afterwards. Electronic microscopic observation showed that at the early stage of the toxication,chloroplasts and mitochondria were swelling up;and thylakoids vacuolized apparently. Higher concentration of Cd 2+ aggravated the damage,making chloroplast membranes disappear and chloroplasts disintegrate,mitochondrion mesenchyme dissolve and mitochondria be on the verge of disorganization,and nucleolus chromatin agglutinate and merge into cytoplasm. Cd 2+ pollution not only destroys the plant's antioxidase system,but also causes irreversible damage to its ultrastructure,thus leading the cells to death.
【Fund】: 国家自然科学基金 !(3 9770 0 46)
【CateGory Index】: X171.5;;X592
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