Effects of cerium on growth and physiological characteristics of Anabaena flosaquae
来源期刊：JOURNAL OF RARE EARTHS2012年第12期
论文作者：王应军 李嘉 吕赟 金航标 邓仕槐 曾韵敏
文章页码：1287 - 1292
摘 要：In the present study, the effects of cerium （Ce） on the growth and physiological changes were investigated in the cyanobacterium Anabaena flosaquae （A. flosaquae） during a 17-day period. The results showed that the content of chlorophyll a （chl-a） and activity of anti-oxidase （e.g. superoxide dismutase, peroxidase, and catalase） increased with Ce3+ concentration in the range of 0.05 to 0.1 mg/L and the growth of A. flosaquae was stimulated. While at around 5 mg/L, the content of malondiadehyde （MDA） increased significantly but the activ-ity of antioxidase reduced, which resulted in the ruin of antioxidant defense system. Compared to the control （Ce3+-free）, the population size of live cells declined significantly. Microcystin-LR （MC-LR）, the most common and toxic cyanotoxins produced by A. flosaquae, was de-tected and the highest content of MC-LR was observed in 10 mg/L Ce3+ treatment. These results implied that the aqueous environment might suffer a more negative ecological impact when exposed to relatively low Ce3+ concentrations （<0.1 mg/L）.)
王应军1,2，李嘉1，吕赟2，金航标2，邓仕槐2，曾韵敏2
1. State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University2. College of Resources and Environment,Sichuan Agricultural University
摘 要：In the present study, the effects of cerium （Ce） on the growth and physiological changes were investigated in the cyanobacterium Anabaena flosaquae （A. flosaquae） during a 17-day period. The results showed that the content of chlorophyll a （chl-a） and activity of anti-oxidase （e.g. superoxide dismutase, peroxidase, and catalase） increased with Ce3+ concentration in the range of 0.05 to 0.1 mg/L and the growth of A. flosaquae was stimulated. While at around 5 mg/L, the content of malondiadehyde （MDA） increased significantly but the activ-ity of antioxidase reduced, which resulted in the ruin of antioxidant defense system. Compared to the control （Ce3+-free）, the population size of live cells declined significantly. Microcystin-LR （MC-LR）, the most common and toxic cyanotoxins produced by A. flosaquae, was de-tected and the highest content of MC-LR was observed in 10 mg/L Ce3+ treatment. These results implied that the aqueous environment might suffer a more negative ecological impact when exposed to relatively low Ce3+ concentrations （<0.1 mg/L）.)
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