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Comparative studies on physiological responses to phosphorus in two phenotypes of bloom-forming Microcystis
Shen, Hong; Song, Lirong; Song, LR, Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
2007-11-01
Source PublicationHYDROBIOLOGIA
ISSN0018-8158
Volume592Pages:475-486
AbstractToxic Microcystis blooms frequently occur in eutrophic water bodies and exist in the form of colonial and unicellular cells. In order to understand the mechanism of Microcystis dominance in freshwater bodies, the physiological and biochemical responses of unicellular ( 4 strains) and colonial ( 4 strains) Microcystis strains to phosphorus ( P) were comparatively studied. The two phenotype strains exhibit physiological differences mainly in terms of their response to low P concentrations. The growth of four unicellular and one small colonial Microcystis strain was significantly inhibited at a P concentration of 0.2 mg l - 1; however, that of the large colonial Microcystis strains was not inhibited. The results of phosphate uptake experiments conducted using P- starved cells indicated that the colonial strains had a higher affinity for low levels of P. The unicellular strains consumed more P than the colonial strains. Alkaline phosphatase activity in the unicellular strains was significantly induced by low P concentrations. Under P- limited conditions, the oxygen evolution rate, Fv/ Fm, and ETRmax were lower in unicellular strains than in colonial strains. These findings may shed light on the mechanism by which colonial Microcystis strains have an advantage with regard to dominance and persistence in fluctuating P conditions.; Toxic Microcystis blooms frequently occur in eutrophic water bodies and exist in the form of colonial and unicellular cells. In order to understand the mechanism of Microcystis dominance in freshwater bodies, the physiological and biochemical responses of unicellular ( 4 strains) and colonial ( 4 strains) Microcystis strains to phosphorus ( P) were comparatively studied. The two phenotype strains exhibit physiological differences mainly in terms of their response to low P concentrations. The growth of four unicellular and one small colonial Microcystis strain was significantly inhibited at a P concentration of 0.2 mg l - 1; however, that of the large colonial Microcystis strains was not inhibited. The results of phosphate uptake experiments conducted using P- starved cells indicated that the colonial strains had a higher affinity for low levels of P. The unicellular strains consumed more P than the colonial strains. Alkaline phosphatase activity in the unicellular strains was significantly induced by low P concentrations. Under P- limited conditions, the oxygen evolution rate, Fv/ Fm, and ETRmax were lower in unicellular strains than in colonial strains. These findings may shed light on the mechanism by which colonial Microcystis strains have an advantage with regard to dominance and persistence in fluctuating P conditions.
SubtypeArticle
KeywordUnicellular And Colonial Microcystis Alkaline Phosphatase Activity P-i Uptake Oxygen Evolution Activity F-v/f-m Maximum Electron Transport Rate (Etrmax)
DepartmentChinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China; Chinese Acad Sci, Grad Sch, Beijing, Peoples R China
Subject AreaMarine & Freshwater Biology
DOI10.1007/s10750-007-0794-3
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaMarine & Freshwater Biology
WOS SubjectMarine & Freshwater Biology
WOS IDWOS:000249205000031
WOS KeywordALKALINE-PHOSPHATASE ACTIVITY ; BLUE-GREEN-ALGAE ; LIMITED CULTURES ; P-CONCENTRATIONS ; UPTAKE KINETICS ; PHYTOPLANKTON ; AERUGINOSA ; CYANOBACTERIA ; LIMITATION ; CHLOROPHYTA
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Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/8456
Collection期刊论文
Corresponding AuthorSong, LR, Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
Affiliation1.Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Shen, Hong,Song, Lirong,Song, LR, Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China. Comparative studies on physiological responses to phosphorus in two phenotypes of bloom-forming Microcystis[J]. HYDROBIOLOGIA,2007,592:475-486.
APA Shen, Hong,Song, Lirong,&Song, LR, Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China.(2007).Comparative studies on physiological responses to phosphorus in two phenotypes of bloom-forming Microcystis.HYDROBIOLOGIA,592,475-486.
MLA Shen, Hong,et al."Comparative studies on physiological responses to phosphorus in two phenotypes of bloom-forming Microcystis".HYDROBIOLOGIA 592(2007):475-486.
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