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Identification of a New Microcystin-Degrading Bacterium Isolated from Lake Chaohu, China

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Abstract

A microcystin-LR (MC-LR)-degrading bacterium was isolated from Lake Chaohu, a eutrophic freshwater lake containing toxic cyanobacterial blooms. Based on the analysis of 16S rDNA gene sequence and physiobiochemical characteristics, the isolated strain, most likely belongs to the genus Bacillus with the highest sequence similarity value with Bacillus nanhaiencis strain K-W39 (JQ799091.1), was named B. nanhaiencis strain JZ-2013. The strain JZ-2013 could grow on mineral salt medium supplied with MC-LR as sole carbon and nitrogen sources. The optimal temperature and pH for strain JZ-2013 growth and MC-LR biodegradation were 30°C and 8.0, respectively. The MC-LR with the initial concentration of 15 mg/L could be consumed 80 % by strain JZ-2013 within 9 days. The existence of exogenous carbon and nitrogen sources could significantly increase the removal efficiency of MC-LR. The strain JZ-2013 can efficiently removed MC-LR of low concentration in real water sample.

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Acknowledgments

This work was financially supported by the Specialized Research Fund for Doctoral Program of Higher Education from Chinese Ministry of Education (No. 20123424110004), the Anhui Provincial Natural Science Foundation (No. 1208085MC42), the Key Laboratory of Bioresource Protection and Utilization of Anhui Province, the Key Laboratory of Biotic Environment and Ecological Safety of Anhui Province, and the Program for Innovative Research Team at Anhui Normal University.

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Authors and Affiliations

  1. College of Life Science, Anhui Normal University, Wuhu, 241000, People’s Republic of China

    Jian Zhang, Hui Shi, Aimin Liu, Zhengyu Cao, Jiasheng Hao & Renmin Gong

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  1. Jian Zhang
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  2. Hui Shi
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  3. Aimin Liu
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  4. Zhengyu Cao
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  5. Jiasheng Hao
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  6. Renmin Gong
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Correspondence to Jiasheng Hao or Renmin Gong.

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Zhang, J., Shi, H., Liu, A. et al. Identification of a New Microcystin-Degrading Bacterium Isolated from Lake Chaohu, China. Bull Environ Contam Toxicol 94, 661–666 (2015). https://doi.org/10.1007/s00128-015-1531-7

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  • DOI: https://doi.org/10.1007/s00128-015-1531-7

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