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The role of microcystins in maintaining colonies of bloom-forming Microcystis spp.
文献类型：期刊论文
| 作者 | Gan, Nanqin; Xiao, Yan; Zhu, Lin; Wu, Zhongxing; Liu, Jin; Hu, Chenlin; Song, Lirong |
| 刊名 | ENVIRONMENTAL MICROBIOLOGY
 |
| 出版日期 | 2012-03-01 |
| 卷号 | 14期号:3页码:730-742 |
| 关键词 | BLUE-GREEN-ALGA AERUGINOSA CYANOBACTERIA SIZE BIOSYNTHESIS STRAINS GENES POLYSACCHARIDES HEPATOTOXINS CYANOPHYCEAE |
| ISSN号 | 1462-2912 |
| 通讯作者 | Song, LR (reprint author), CAS, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Donghu Nanlu 7, Wuhan 430072, Peoples R China. |
| 中文摘要 | 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. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine |
| 类目[WOS] | Microbiology |
| 研究领域[WOS] | Microbiology |
| 关键词[WOS] | BLUE-GREEN-ALGA ; AERUGINOSA ; CYANOBACTERIA ; SIZE ; BIOSYNTHESIS ; STRAINS ; GENES ; POLYSACCHARIDES ; HEPATOTOXINS ; CYANOPHYCEAE |
| 收录类别 | SCI |
| 资助信息 | '973' programme[2008CB418000]; National Natural Science Foundation of China[31070355]; Natural Science Foundation of China[U0833604]; Chinese Academy of Sciences[KZCX1-YW-14-1] |
| 语种 | 英语 |
| WOS记录号 | WOS:000302539900015 |
| 公开日期 | 2012-09-25 |
| 源URL | [http://ir.ihb.ac.cn/handle/342005/17049]  |
| 专题 | 水生生物研究所_藻类生物学及应用研究中心_期刊论文 |
| 作者单位 | CAS, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China |
| 推荐引用方式 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, Lirong.(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. |
入库方式： OAI收割
来源：水生生物研究所
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