Effects of cerium on growth and physiological characteristics of Anabaena flosaquae

被引：0

作者：

王应军 ^{[1
,2
]}

李嘉 ^{[1
]}

吕赟 ^{[2
]}

金航标 ^{[2
]}

邓仕槐 ^{[2
]}

曾韵敏 ^{[2
]}

机构：

[1] State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University

[2] College of Resources and Environment,Sichuan Agricultural University

来源：

Journal of Rare Earths | 2012年 / 30卷 / 12期

关键词：

Anabaena flosaquae; cerium; growth; microcystin-LR; rare earths;

D O I：

暂无

中图分类号：

X173 [环境植物学];

学科分类号：

071012 ; 0713 ;

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).)

引用

页码：1287 / 1292

页数：6

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