Morphological and physiological changes in Microcystis aeruginosa as a result of interactions with heterotrophic bacteria

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	Morphological and physiological changes in Microcystis aeruginosa as a result of interactions with heterotrophic bacteria
	Shen, Hong; Niu, Yuan; Xie, Ping; Tao, Min; Yang, Xi; Xie, P (reprint author), Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol China, Donghu Expt Stn Lake Ecosyst, Wuhan, Peoples R China; xieping@ihb.ac.cn
刊名	FRESHWATER BIOLOGY
	2011
卷号	56 期号:6 页码:1065-1080
关键词	Aggregation Community Composition Extracellular Polysaccharide Heterotrophic Bacteria Microcystis Aeruginosa
ISSN号	0046-5070
英文摘要	P>1. To reveal the role of aquatic heterotrophic bacteria in the process of development of Microcystis blooms in natural waters, we cocultured unicellular Microcystis aeruginosa with a natural Microcystis-associated heterotrophic bacterial community. 2. Unicellular M. aeruginosa at different initial cell densities aggregated into colonies in the presence of heterotrophic bacteria, while axenic Microcystis continued to grow as single cells. The specific growth rate, the chl a content, the maximum electron transport rate (ETR(max)) and the synthesis and secretion of extracellular polysaccharide (EPS) were higher in non-axenic M. aeruginosa than in axenic M. aeruginosa after cell aggregation, whereas axenic and non-axenic M. aeruginosa displayed the same physiological characteristic before aggregation. 3. Heterotrophic bacterial community composition was analysed by PCR-denaturing gradient gel electrophoresis (PCR-DGGE) fingerprinting. The biomass of heterotrophic bacteria strongly increased in the coinoculated cultures, but the DGGE banding patterns in coinoculated cultures were distinctly dissimilar to those in control cultures with only heterotrophic bacteria. Sequencing of DGGE bands suggested that Porphyrobacter, Flavobacteriaceae and one uncultured bacterium could be specialist bacteria responsible for the aggregation of M. aeruginosa. 4. The production of EPS in non-axenic M. aeruginosa created microenvironments that probably served to link both cyanobacterial cells and their associated bacterial cells into mutually beneficial colonies. Microcystis colony formation facilitates the maintenance of high biomass for a long time, and the growth of heterotrophic bacteria was enhanced by EPS secretion from M. aeruginosa. 5. The results from our study suggest that natural heterotrophic bacterial communities have a role in the development of Microcystis blooms in natural waters. The mechanisms behind the changes of the bacterial community and interaction between cyanobacteria and heterotrophic bacteria need further investigations.
学科主题	Marine & Freshwater Biology
语种	英语
WOS记录号	WOS:000289640800004
资助机构	National Basic Research Program of China[2008CB418101]; Chinese Academy of Sciences[KZCX1-YW-14-6-1]; National Science Foundation for Postdoctoral Scientists of China[20070420915] ; National Basic Research Program of China[2008CB418101]; Chinese Academy of Sciences[KZCX1-YW-14-6-1]; National Science Foundation for Postdoctoral Scientists of China[20070420915] ; National Basic Research Program of China[2008CB418101]; Chinese Academy of Sciences[KZCX1-YW-14-6-1]; National Science Foundation for Postdoctoral Scientists of China[20070420915] ; National Basic Research Program of China[2008CB418101]; Chinese Academy of Sciences[KZCX1-YW-14-6-1]; National Science Foundation for Postdoctoral Scientists of China[20070420915]
公开日期	2011-12-22
内容类型	期刊论文
源URL	[http://ir.ihb.ac.cn/handle/342005/16435]
专题	水生生物研究所_淡水生态学研究中心_期刊论文
通讯作者	Xie, P (reprint author), Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol China, Donghu Expt Stn Lake Ecosyst, Wuhan, Peoples R China; xieping@ihb.ac.cn
推荐引用方式 GB/T 7714	Shen, Hong,Niu, Yuan,Xie, Ping,et al. Morphological and physiological changes in Microcystis aeruginosa as a result of interactions with heterotrophic bacteria[J]. FRESHWATER BIOLOGY,2011,56(6):1065-1080.
APA	Shen, Hong.,Niu, Yuan.,Xie, Ping.,Tao, Min.,Yang, Xi.,...&xieping@ihb.ac.cn.(2011).Morphological and physiological changes in Microcystis aeruginosa as a result of interactions with heterotrophic bacteria.FRESHWATER BIOLOGY,56(6),1065-1080.
MLA	Shen, Hong,et al."Morphological and physiological changes in Microcystis aeruginosa as a result of interactions with heterotrophic bacteria".FRESHWATER BIOLOGY 56.6(2011):1065-1080.