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The role of microcystins in maintaining colonies of bloom-forming Microcystis spp.
Gan, Nanqin; Xiao, Yan; Zhu, Lin; Wu, Zhongxing; Liu, Jin; Hu, Chenlin; Song, Lirong; Song, LR (reprint author), CAS, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Donghu Nanlu 7, Wuhan 430072, Peoples R China.
2012-03-01
Source PublicationENVIRONMENTAL MICROBIOLOGY
ISSN1462-2912
Volume14Issue:3Pages:730-742
AbstractMicrocystis is a cosmopolitan genus of cyanobacteria and occurs in many different forms. Large surface blooms of the cyanobacterium are well known in eutrophic lakes throughout the globe. We evaluated the role of microcystins (MCs) in promoting and maintaining bloom-forming cell aggregates at environmentally relevant MC concentrations (0.25-10 mu g l(-1)). MCs significantly enhanced Microcystis colony sizes. Colonial diameters in microcystin-RR (MC-RR)-treated cultures (at 1 mu g l(-1)) were significantly larger than control colonies, by factors of 1.5, 2.6 and 2.7 in Microcystis wesenbergii DC-M1, M. ichthyoblabe TH-M1 and Microcystis sp. FACHB1027 respectively. Depletion of extracellular MC concentrations caused Microcystis colony size to decrease, suggesting that released MCs are intimately involved in the maintenance of Microcystis colonial size. MC-RR exposure did not influence Microcystis growth rate, but did significantly increase the production of extracellular polysaccharides (EPS). In addition, MC-RR exposure appeared to trigger upregulation of certain parts of four polysaccharide biosynthesis-related genes: capD, csaB, tagH and epsL. These results strongly indicate that induction of polysaccharides by MC-RR was the major mechanism through which MCs enhanced colony formation in Microcystis spp. Cellular release of MCs, therefore, may play a key role in the persistence of algal colonies and the dominance of Microcystis.; Microcystis is a cosmopolitan genus of cyanobacteria and occurs in many different forms. Large surface blooms of the cyanobacterium are well known in eutrophic lakes throughout the globe. We evaluated the role of microcystins (MCs) in promoting and maintaining bloom-forming cell aggregates at environmentally relevant MC concentrations (0.25-10 mu g l(-1)). MCs significantly enhanced Microcystis colony sizes. Colonial diameters in microcystin-RR (MC-RR)-treated cultures (at 1 mu g l(-1)) were significantly larger than control colonies, by factors of 1.5, 2.6 and 2.7 in Microcystis wesenbergii DC-M1, M. ichthyoblabe TH-M1 and Microcystis sp. FACHB1027 respectively. Depletion of extracellular MC concentrations caused Microcystis colony size to decrease, suggesting that released MCs are intimately involved in the maintenance of Microcystis colonial size. MC-RR exposure did not influence Microcystis growth rate, but did significantly increase the production of extracellular polysaccharides (EPS). In addition, MC-RR exposure appeared to trigger upregulation of certain parts of four polysaccharide biosynthesis-related genes: capD, csaB, tagH and epsL. These results strongly indicate that induction of polysaccharides by MC-RR was the major mechanism through which MCs enhanced colony formation in Microcystis spp. Cellular release of MCs, therefore, may play a key role in the persistence of algal colonies and the dominance of Microcystis.
SubtypeArticle
KeywordBlue-green-alga Aeruginosa Cyanobacteria Size Biosynthesis Strains Genes Polysaccharides Hepatotoxins Cyanophyceae
Department[Gan, Nanqin; Xiao, Yan; Zhu, Lin; Wu, Zhongxing; Liu, Jin; Hu, Chenlin; Song, Lirong] CAS, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
DOI10.1111/j.1462-2920.2011.02624.x
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Funding Organization'973' programme[2008CB418000]; National Natural Science Foundation of China[31070355]; Natural Science Foundation of China[U0833604]; Chinese Academy of Sciences[KZCX1-YW-14-1] ; '973' programme[2008CB418000]; National Natural Science Foundation of China[31070355]; Natural Science Foundation of China[U0833604]; Chinese Academy of Sciences[KZCX1-YW-14-1] ; '973' programme[2008CB418000]; National Natural Science Foundation of China[31070355]; Natural Science Foundation of China[U0833604]; Chinese Academy of Sciences[KZCX1-YW-14-1] ; '973' programme[2008CB418000]; National Natural Science Foundation of China[31070355]; Natural Science Foundation of China[U0833604]; Chinese Academy of Sciences[KZCX1-YW-14-1]
Indexed BySCI
Language英语
WOS Research AreaMicrobiology
WOS SubjectMicrobiology
WOS IDWOS:000302539900015
WOS KeywordBLUE-GREEN-ALGA ; AERUGINOSA ; CYANOBACTERIA ; SIZE ; BIOSYNTHESIS ; STRAINS ; GENES ; POLYSACCHARIDES ; HEPATOTOXINS ; CYANOPHYCEAE
Funding Organization'973' programme[2008CB418000]; National Natural Science Foundation of China[31070355]; Natural Science Foundation of China[U0833604]; Chinese Academy of Sciences[KZCX1-YW-14-1] ; '973' programme[2008CB418000]; National Natural Science Foundation of China[31070355]; Natural Science Foundation of China[U0833604]; Chinese Academy of Sciences[KZCX1-YW-14-1] ; '973' programme[2008CB418000]; National Natural Science Foundation of China[31070355]; Natural Science Foundation of China[U0833604]; Chinese Academy of Sciences[KZCX1-YW-14-1] ; '973' programme[2008CB418000]; National Natural Science Foundation of China[31070355]; Natural Science Foundation of China[U0833604]; Chinese Academy of Sciences[KZCX1-YW-14-1]
Citation statistics
Cited Times:97[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/17049
Collection藻类生物学及应用研究中心_期刊论文
Corresponding AuthorSong, LR (reprint author), CAS, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Donghu Nanlu 7, Wuhan 430072, Peoples R China.
AffiliationCAS, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Gan, Nanqin,Xiao, Yan,Zhu, Lin,et al. The role of microcystins in maintaining colonies of bloom-forming Microcystis spp.[J]. ENVIRONMENTAL MICROBIOLOGY,2012,14(3):730-742.
APA Gan, Nanqin.,Xiao, Yan.,Zhu, Lin.,Wu, Zhongxing.,Liu, Jin.,...&Song, LR .(2012).The role of microcystins in maintaining colonies of bloom-forming Microcystis spp..ENVIRONMENTAL MICROBIOLOGY,14(3),730-742.
MLA Gan, Nanqin,et al."The role of microcystins in maintaining colonies of bloom-forming Microcystis spp.".ENVIRONMENTAL MICROBIOLOGY 14.3(2012):730-742.
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