Document Detail

Response of microcystis to copper stress: do phenotypes of microcystis make a difference in stress tolerance?
MedLine Citation:
PMID:  16828944     Owner:  NLM     Status:  MEDLINE    
To elucidate the role of phenotype in stress-tolerant bloom-forming cyanobacterium Microcystis, two phenotypes of M. aeruginosa - unicellular and colonial strains were selected to investigate how they responded to copper stress. Flow cytometry (FCM) examination indicated that the percents of viable cells in unicellular and colonial Microcystis were 1.92-2.83% and 72.3-97.51%, respectively, under 0.25 mgl(-1) copper sulfate treatment for 24h. Upon exposure to 0.25 mgl(-1) copper sulfate, the activities of antioxidative enzyme, such as superoxide dismutase (SOD) and catalase (CAT), were significantly increased in colonial Microcystis compared to unicellular Microcystis. Meanwhile, the values of the photosynthetic parameters (F(v)/F(m), ETR(max), and oxygen evolution rate) decreased more rapidly in unicellular Microcystis than in colonial Microcystis. The results indicate that colonial Microcystis has a higher endurance to copper than unicellular Microcystis. This suggests that the efficient treatment concentration of copper sulfate as algaecides will be dependent on the phenotypes of Microcystis.
Zhong-Xing Wu; Nan-Qin Gan; Qun Huang; Li-Rong Song
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-07-07
Journal Detail:
Title:  Environmental pollution (Barking, Essex : 1987)     Volume:  147     ISSN:  0269-7491     ISO Abbreviation:  Environ. Pollut.     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-04-09     Completed Date:  2007-08-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804476     Medline TA:  Environ Pollut     Country:  England    
Other Details:
Languages:  eng     Pagination:  324-30     Citation Subset:  IM    
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, PR China.
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MeSH Terms
Antioxidants / metabolism
Catalase / metabolism
Chlorophyll / metabolism
Copper Sulfate / toxicity*
Culture Media
Electron Transport / drug effects,  physiology
Flow Cytometry / methods
Microcystis / drug effects*,  physiology
Oxidative Stress / physiology
Photosynthesis / physiology
Superoxide Dismutase / metabolism
Water Microbiology
Water Pollutants, Chemical / toxicity*
Reg. No./Substance:
0/Antioxidants; 0/Culture Media; 0/Water Pollutants, Chemical; 1406-65-1/Chlorophyll; 479-61-8/chlorophyll a; 7758-98-7/Copper Sulfate; EC; EC Dismutase

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