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Journal of Applied Phycology

, Volume 25, Issue 4, pp 1023–1030 | Cite as

Changes in extracellular polysaccharide content and morphology of Microcystis aeruginosa at different specific growth rates

  • Ming Li
  • Wei Zhu
  • Li Gao
  • Lin Lu
Article

Abstract

The cyanobacterium Microcystis mainly exists in colonies under natural conditions but as single cells in typical laboratory cultures. Understanding the mechanism by which single cells form small and large colonies can provide a deeper insight into the life history of Microcystis and the mechanisms of Microcystis bloom formation. In this paper, Microcystis aeruginosa cultured under varying light intensities and temperatures exhibited different specific growth rates. Correlations were found between the specific growth rate, extracellular polysaccharide (EPS) content, and morphology of M. aeruginosa. Under low light intensities and temperatures, M. aeruginosa formed small colonies (maximum colony size approximately 100 μm) and exhibited low specific growth rates. By contrast, standard culture conditions yielded single or paired cells with high specific growth rates. Moreover, the EPS content decreased dramatically with increasing specific growth rate. A significant positive linear relationship was observed between the EPS content per cell and colony size. High EPS content and colony formation were associated with low specific growth rates. The specific growth rate in laboratory cultures was higher than the in situ growth rate under natural conditions. This result may explain why Microcystis normally exists as single cells or (more rarely) as paired cells in axenic laboratory cultures after long-term cultivation, but forms colonies under natural conditions.

Keywords

Microcystis aeruginosa Light intensity Temperature Specific growth rate EPS Morphology 

Notes

Acknowledgments

We thank two anonymous referees for carefully reviewing the manuscript and for their constructive comments which improved it substantially. This study was sponsored by the National Program on Key Basic Research Project of China (2012CB719804), the Natural Science Foundation of Jiangsu Province (BK2011025), and the Hydraulic Science & Technology Project of Jiangsu Province (2011069).

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  1. 1.College of EnvironmentHohai UniversityNanjingPeople’s Republic of China
  2. 2.National Engineering Research Center of Water Resources Efficient Utilization and Engineering SafetyHohai UniversityNanjingPeople’s Republic of China
  3. 3.Infrastructure Development DepartmentColiban Region Water CorporationBendigoAustralia

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