Physiological and biochemical microcystin-RR toxicity to the Synechococcus elongatus
文献类型：期刊论文
| 作者 | Hu, ZQ; Liu, YD; Li, DH |
| 刊名 | ENVIRONMENTAL TOXICOLOGY
 |
| 出版日期 | 2004-12-01 |
| 卷号 | 19期号:6页码:571-577 |
| 关键词 | microcystin-RR growth Synechococcus elongatus pigment chlorophyll fluorescence protein carbohydrate nitrate reductase toxicity |
| ISSN号 | 1520-4081 |
| 通讯作者 | Liu, YD, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China |
| 中文摘要 | Freshwater Microcystis may form dense blooms in eutrophic lakes. It is known to produce a family of related cyclic hepatopeptides (microcystins, MC) that constitute a threat to aquatic ecosystems. Most toxicological studies of microcystins have focused on aquatic animals and plants, with few examining the possible effects of microcystins on phytoplankton. In this study we chose the unicellular Synechococcus elongatus (one of the most studied and geographically most widely distributed cyanobacteria in the picoplankton) as the test material and investigated the biological parameters: growth, pigment (chlorophyll-a, phycocyanin), photosynthetic activity, nitrate reductase activity, and protein and carbohydrate content. The results revealed that microcystin-RR concentrations above 100 mug (.) L-1 significantly inhibited the growth of Synechococcus elongatus. In addition, a change in color of the toxin-treated algae (chlorosis) was observed in the experiments. Furthermore, MC-RR markedly inhibited the synthesis of the pigments chlorophyll-a and phycocyanin. A drastic reduction in photochemical efficiency of PSII (F-v/F-m) was found after a 96-h incubation. Changes in protein and carbohydrate concentrations and in nitrate reductase activity also were observed during the exposure period. This study aimed to evaluate the mechanisms of microcystin toxicity on a cyanobacterium, according to the physiological and biochemical responses of Synechococcus elongatus to different doses of microcystin-RR. The ecological role of microcystins as an allelopathic substance also is discussed in the article. (C) 2004 Wiley Periodicals, Inc. |
| 英文摘要 | Freshwater Microcystis may form dense blooms in eutrophic lakes. It is known to produce a family of related cyclic hepatopeptides (microcystins, MC) that constitute a threat to aquatic ecosystems. Most toxicological studies of microcystins have focused on aquatic animals and plants, with few examining the possible effects of microcystins on phytoplankton. In this study we chose the unicellular Synechococcus elongatus (one of the most studied and geographically most widely distributed cyanobacteria in the picoplankton) as the test material and investigated the biological parameters: growth, pigment (chlorophyll-a, phycocyanin), photosynthetic activity, nitrate reductase activity, and protein and carbohydrate content. The results revealed that microcystin-RR concentrations above 100 mug (.) L-1 significantly inhibited the growth of Synechococcus elongatus. In addition, a change in color of the toxin-treated algae (chlorosis) was observed in the experiments. Furthermore, MC-RR markedly inhibited the synthesis of the pigments chlorophyll-a and phycocyanin. A drastic reduction in photochemical efficiency of PSII (F-v/F-m) was found after a 96-h incubation. Changes in protein and carbohydrate concentrations and in nitrate reductase activity also were observed during the exposure period. This study aimed to evaluate the mechanisms of microcystin toxicity on a cyanobacterium, according to the physiological and biochemical responses of Synechococcus elongatus to different doses of microcystin-RR. The ecological role of microcystins as an allelopathic substance also is discussed in the article. (C) 2004 Wiley Periodicals, Inc. |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences |
| 学科主题 | Environmental Sciences; Toxicology; Water Resources |
| 类目[WOS] | Environmental Sciences ; Toxicology ; Water Resources |
| 研究领域[WOS] | Environmental Sciences & Ecology ; Toxicology ; Water Resources |
| 关键词[WOS] | CYANOBACTERIUM FISCHERELLA MUSCICOLA ; TOXIN PRODUCTION ; AERUGINOSA ; LR ; CYANOTOXINS ; GROWTH ; METABOLITES ; SURVIVAL ; DAPHNIA ; TROUT |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000225484100004 |
| 公开日期 | 2010-10-13 |
| 源URL | [http://ir.ihb.ac.cn/handle/152342/9376]  |
| 专题 | 水生生物研究所_中科院水生所知识产出（2009年前）_期刊论文 |
| 作者单位 | Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, ZQ,Liu, YD,Li, DH. Physiological and biochemical microcystin-RR toxicity to the Synechococcus elongatus[J]. ENVIRONMENTAL TOXICOLOGY,2004,19(6):571-577. |
| APA | Hu, ZQ,Liu, YD,&Li, DH.(2004).Physiological and biochemical microcystin-RR toxicity to the Synechococcus elongatus.ENVIRONMENTAL TOXICOLOGY,19(6),571-577. |
| MLA | Hu, ZQ,et al."Physiological and biochemical microcystin-RR toxicity to the Synechococcus elongatus".ENVIRONMENTAL TOXICOLOGY 19.6(2004):571-577. |
入库方式： OAI收割
来源：水生生物研究所
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