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题名: Effects of microcystins on and toxin degradation by Poterioochromonas sp.
作者: Ou, DY; Song, LR; Gan, NQ; Chen, W
关键词: microcystins ; toxicology ; biodegradation ; Poterioochromonas
刊名: ENVIRONMENTAL TOXICOLOGY
发表日期: 2005-06-01
DOI: 10.1002/tox.20114
卷: 20, 期:3, 页:373-380
收录类别: ISTP ; SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
类目[WOS]: Environmental Sciences ; Toxicology ; Water Resources
研究领域[WOS]: Environmental Sciences & Ecology ; Toxicology ; Water Resources
英文摘要: A Chrysophyceae species, Poterioochromonas sp., was isolated from Microcystis cultures. This species can efficiently prey on Microcystis and can grow faster phagotrophically than autotrophically. The growth of Poterioochromonas sp. was stimulated in the presence of microcystin-LR and microcystin-RR (in concentrations ranging from 0.1 to 4 mg/L). The growth rate of Poterioochromonas was 4-5 times higher than the control, indicating the toxins serve as growth stimuli for this organism. A subculture of toxin-treated cells, however, showed low cellular viability, suggesting that growth enhancement by microcystins was not a normal process. The antioxidant enzymatic activity of Poterioochromonas sp. was screened for toxicology analysis. Glutathione; malondialdehyde, and superoxide dismutase (SOD) content was up-regulated within,8 h of exposure to microcystin-LR (500 mu g/L). A high level of SOD activity during exposure to the toxin indicated that SOD was involved in decreasing oxidative stress caused by microcystin-LR. Simultaneously with growth, Poterioochromonas was able to degrade microcystin-LR even, at a toxin concentration of 4 mg/L. This putative degradation mechanism in Poterioochromonas is explored further and discussed in this article. Our findings may shed light on understanding the role of Poterioochromonas in the aquatic ecosystem, in particular, as a grazer of toxic cyanobacteria and a biodegrader for microcystins. (c) 2005 Wiley Periodicals, Inc.
关键词[WOS]: INTRACELLULAR GLUTATHIONE ALTERATION ; CYANOBACTERIAL HEPATOTOXINS ; BACTERIAL-DEGRADATION ; OCHROMONAS-DANICA ; LR ; MALHAMENSIS ; CHRYSOPHYCEAE ; DECOMPOSITION ; HEPATOCYTES ; PHAGOTROPHY
语种: 英语
WOS记录号: WOS:000229897500022
ISSN号: 1520-4081
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/27195
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing, Peoples R China
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