Changes in the morphology and polysaccharide content of Microcystis aeruginosa (Cyanobacteria) during flagellate grazing

Zhou Yang, Fanxiang Kong, Xiaoli Shi, Min Zhang, Peng Xing, Huansheng Cao

Research output: Contribution to journalArticle

143 Scopus citations

Abstract

To investigate the changes in the morphology and polysaccharide content of Microcystis aeruginosa (Kütz.) Kütz. during flagellate grazing, cultures of M. aeruginosa were exposed to grazing Ochromonas sp. for a period of 9 d under controlled laboratory conditions. M. aeruginosa responded actively to flagellate grazing and formed colonies, most of which were made up of several or dozens of cells, suggesting that flagellate grazing may be one of the biotic factors responsible for colony formation in M. aeruginosa. When colonies were formed, the cell surface ultrastructure changed, and the polysaccharide layer on the surface of the cell wall became thicker. This change indicated that synthesis and secretion of extracellular polysaccharide (EPS) of M. aeruginosa cells increased under flagellate grazing pressure. The contents of soluble extracellular polysaccharide (sEPS), bound extracellular polysaccharide (bEPS), and total polysaccharide (TPS) in colonial cells of M. aeruginosa increased significantly compared with those in single cells. This finding suggested that the increased amount of EPS on the cell surface may play a role in keeping M. aeruginosa cells together to form colonies.

Original languageEnglish (US)
Pages (from-to)716-720
Number of pages5
JournalJournal of Phycology
Volume44
Issue number3
DOIs
StatePublished - Jun 1 2008
Externally publishedYes

Keywords

  • Colony formation
  • Extracellular polysaccharide
  • Flagellate
  • Microcystis aeruginosa
  • Ultrastructure

ASJC Scopus subject areas

  • Aquatic Science
  • Plant Science

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