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学科主题: Plant Sciences; Marine & Freshwater Biology
题名: Effects of CO2 enrichment on the bloom-forming cyanobacterium Microcystis aeruginosa (Cyanophyceae): Physiological responses and relationships with the availability of dissolved inorganic carbon
作者: Baosheng Qiu ; Kunshan Gao
通讯作者: Qiu, BS, Cent China Normal Univ, Coll Life Sci, Wuhan 430072, Hubei, Peoples R China
关键词: blue-green alga ; carbon dioxide ; cyanobacterium ; dissolved inorganic carbon ; elevated CO2 ; growth ; Microcystis aeruginosa ; photosynthesis
刊名: JOURNAL OF PHYCOLOGY
发表日期: 2002
卷: 38, 期:4, 页:721-729
收录类别: SCI
部门归属: Cent 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
摘要: Microcystis 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.
WOS记录号: WOS:000177836500012
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/9808
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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Baosheng Qiu; Kunshan Gao .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,2002,38(4):721-729
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