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Effects of cerium on growth and physiological characteristics of Anabaena flosaquae

Authors :
Yunmin Zeng
Shihuai Deng
Yun Lü
Hangbiao Jin
Yingjun Wang
Jia Li
Source :
Journal of Rare Earths. 30:1287-1292
Publication Year :
2012
Publisher :
Elsevier BV, 2012.

Abstract

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 antioxidase (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 activity 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 detected 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 (

Details

ISSN :
10020721
Volume :
30
Database :
OpenAIRE
Journal :
Journal of Rare Earths
Accession number :
edsair.doi...........d8c0c8094709256303702ca9b48ed02c
Full Text :
https://doi.org/10.1016/s1002-0721(12)60222-1