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Effects of microcystins on and toxin degradation by Poterioochromonas sp.
Ou, DY; Song, LR; Gan, NQ; Chen, W
2005-06-01
Source PublicationENVIRONMENTAL TOXICOLOGY
ISSN1520-4081
Volume20Issue:3Pages:373-380
AbstractA 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.
SubtypeArticle
KeywordMicrocystins Toxicology Biodegradation Poterioochromonas
DOI10.1002/tox.20114
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
Indexed ByISTP ; SCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology ; Toxicology ; Water Resources
WOS SubjectEnvironmental Sciences ; Toxicology ; Water Resources
WOS KeywordINTRACELLULAR GLUTATHIONE ALTERATION ; CYANOBACTERIAL HEPATOTOXINS ; BACTERIAL-DEGRADATION ; OCHROMONAS-DANICA ; LR ; MALHAMENSIS ; CHRYSOPHYCEAE ; DECOMPOSITION ; HEPATOCYTES ; PHAGOTROPHY
WOS IDWOS:000229897500022
Citation statistics
Cited Times:39[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/27195
Collection中科院水生所知识产出(2009年前)
Affiliation1.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
Recommended Citation
GB/T 7714
Ou, DY,Song, LR,Gan, NQ,et al. Effects of microcystins on and toxin degradation by Poterioochromonas sp.[J]. ENVIRONMENTAL TOXICOLOGY,2005,20(3):373-380.
APA Ou, DY,Song, LR,Gan, NQ,&Chen, W.(2005).Effects of microcystins on and toxin degradation by Poterioochromonas sp..ENVIRONMENTAL TOXICOLOGY,20(3),373-380.
MLA Ou, DY,et al."Effects of microcystins on and toxin degradation by Poterioochromonas sp.".ENVIRONMENTAL TOXICOLOGY 20.3(2005):373-380.
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