期刊
JOURNAL OF APPLIED PHYCOLOGY
卷 28, 期 3, 页码 1533-1541出版社
SPRINGER
DOI: 10.1007/s10811-015-0707-1
关键词
Microcystis; Interspecific variation; Colony formation; Extracellular polysaccharide; Morphology
资金
- National Natural Science Foundation of China [51409216]
- Program on Furtherance of Scientific Research of Japan, Fundament C [15K00630]
- China Postdoctoral Science Foundation [2014M562459]
- Grants-in-Aid for Scientific Research [15K00630] Funding Source: KAKEN
Single cells of five different Microcystis species (M. ichthyoblabe, M. viridis, M. flos-aquae, M. wesenbergii, and M. aeruginosa) were batch-cultured at different temperatures and light intensities: (a) 25 degrees C and 50 mu mol photons m(-2) s(-1) (control culture); (b) 25 degrees C and 10 mu mol photons m(-2) s(-1); and (c) 15 degrees C and 50 mu mol photons m(-2) s(-1). The extracellular polysaccharide content was significantly higher in treatments b and c than in the control treatment. All Microcystis species existed as single cells under the control treatment but formed colonies in treatments b and c. All of the colonies were irregular with indistinct margins. M. ichthyoblabe, M. viridis, M. flos-aquae, and M. wesenbergii formed colonies with similar morphologies and their cells were loosely aggregated. In contrast, M. aeruginosa formed denser colonies with no distinct holes. The colony morphologies differed from the classic morphology of M. ichthyoblabe field-grown colonies but resembled that of small colonies found in Lake Taihu (Yangtze Delta Plain, China) during early spring. This indicates that field- and laboratory-grown colonies are governed by similar formation processes. We suggest that in laboratory and field environments, M. ichthyoblabe (or M. flos-aquae) colonies are representative of small colonies formed from single Microcystis cells, whereas the morphology of older colonies evolves to resemble M. wesenbergii and M. aeruginosa colonies.
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