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Effects of CO2 enrichment on the bloom-forming cyanobacterium Microcystis aeruginosa (Cyanophyceae): Physiological responses and relationships with the availability of dissolved inorganic carbon
Baosheng Qiu; Kunshan Gao; Qiu, BS, Cent China Normal Univ, Coll Life Sci, Wuhan 430072, Hubei, Peoples R China
2002
Source PublicationJOURNAL OF PHYCOLOGY
Volume38Issue:4Pages:721-729
AbstractMicrocystis aeruginosa Kutz. 7820 was cultured at 350 and 700 muL.L-1 CO2 to assess the impacts of doubled atmospheric CO2 concentration on this bloom-forming cyanobacterium. Doubling Of CO2 concentration in the airflow enhanced its growth by 52%-77%, with pH values decreased and dissolved inorganic carbon (DIC) increased in the medium. Photosynthetic efficiencies and dark respiratory rates expressed per unit chl a tended to increase with the doubling of CO2. However, saturating irradiances for photosynthesis and light-saturated photosynthetic rates normalized to cell number tended to decrease with the increase of DIC in the medium. Doubling of CO2 concentration in the airflow had less effect on DIC-saturated photosynthetic rates and apparent photosynthetic affinities for DIC. In the exponential phase, CO2 and HCO3- levels in the medium were higher than those required to saturate photosynthesis. Cultures with surface aeration were DIC limited in the stationary phase. The rate of CO2 dissolution into the liquid increased proportionally when CO2 in air was raised from 350 to 700 muL.L-1, thus increasing the availability of DIC in the medium and enhancing the rate of photosynthesis. Doubled CO2 could enhance CO2 dissolution, lower pH values, and influence the ionization fractions of various DIC species even when the photosynthesis was not DIC limited. Consequently, HCO3- concentrations in cultures were significantly higher than in controls, and the photosynthetic energy cost for the operation of CO2 concentrating mechanism might decrease.
KeywordBlue-green Alga Carbon Dioxide Cyanobacterium Dissolved Inorganic Carbon Elevated Co2 Growth Microcystis Aeruginosa Photosynthesis
DepartmentCent China Normal Univ, Coll Life Sci, Wuhan 430072, Hubei, Peoples R China; Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China; Shantou Univ, Ctr Sci, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China
Subject AreaPlant Sciences ; Marine & Freshwater Biology
Indexed BySCI
WOS IDWOS:000177836500012
Citation statistics
Cited Times:51[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/9808
Collection期刊论文
Corresponding AuthorQiu, BS, Cent China Normal Univ, Coll Life Sci, Wuhan 430072, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Baosheng Qiu,Kunshan Gao,Qiu, BS, Cent China Normal Univ, Coll Life Sci, Wuhan 430072, Hubei, Peoples R China. Effects of CO2 enrichment on the bloom-forming cyanobacterium Microcystis aeruginosa (Cyanophyceae): Physiological responses and relationships with the availability of dissolved inorganic carbon[J]. JOURNAL OF PHYCOLOGY,2002,38(4):721-729.
APA Baosheng Qiu,Kunshan Gao,&Qiu, BS, Cent China Normal Univ, Coll Life Sci, Wuhan 430072, Hubei, Peoples R China.(2002).Effects of CO2 enrichment on the bloom-forming cyanobacterium Microcystis aeruginosa (Cyanophyceae): Physiological responses and relationships with the availability of dissolved inorganic carbon.JOURNAL OF PHYCOLOGY,38(4),721-729.
MLA Baosheng Qiu,et al."Effects of CO2 enrichment on the bloom-forming cyanobacterium Microcystis aeruginosa (Cyanophyceae): Physiological responses and relationships with the availability of dissolved inorganic carbon".JOURNAL OF PHYCOLOGY 38.4(2002):721-729.
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