Volume 31 Issue 2
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XU Tao, SONG Li-Rong. STUDIES ON THE UTILITY OF INORGANIC CARBON IN THREE STRAINS OF MICROCY STIS AERUGINOSA[J]. ACTA HYDROBIOLOGICA SINICA, 2007, 31(2): 245-250.
Citation: XU Tao, SONG Li-Rong. STUDIES ON THE UTILITY OF INORGANIC CARBON IN THREE STRAINS OF MICROCY STIS AERUGINOSA[J]. ACTA HYDROBIOLOGICA SINICA, 2007, 31(2): 245-250.
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STUDIES ON THE UTILITY OF INORGANIC CARBON IN THREE STRAINS OF MICROCY STIS AERUGINOSA

  • State key laboratory of freshwater ecology and biotechnology, Institute of hydrobiology, the Chinese Academy of Sciences, Wuhan430072;
    2. Graduate school of the Chinese Academy of Sciences, Beijing 100039

  • Received Date: May 16, 2005
  • Rev Recd Date: August 19, 2006
  • Published Date: March 24, 2007
    Graphical Abstract
    • Abstract
  • Frequent outbreaks of cyanobacterial blooms in eutrophic water bodies throughout the whole country, in particular Microcystis, have been a great threat to water resources. Many researches have been carried out in the primary characteristics of Microcystis, among which, the studies on utility of inorganic carbon may help us further understand the effects of inorganic carbon to the formation of Microcystis bloom and possibly provide clues for the control of Microcystis blooms. In this paper, three strains of M.aeruginosa were studied on their responses of photosynthetic oxygen evolution to different extracellular concentration of dissolved inorganic carbon (DIC) under different photosynthetic conditions, respectively. When the temperature rose from 20 ℃to 30 ℃, the photosynthetic oxygen evolution rate of M.aeruginosa increased. Their photosynthetic oxygen evolution rates were enhanced at high pHvalue, the maximumof which increasedobviouslyfrompH7.0 to pH9.0. While extracellular carbonic anhydrase inhibitor acetazolamide (AZ) showed little effect to the photosynthetic oxygen evolution of M.aeruginosa, intracellular and extracellular carbonic anhydrase inhibitor ethoxyzolamide (EZ) suppressed their photosynthetic oxygen evolution. Simulated with enzyme kinetic equation, their K0.5(DIC) were found to be less than 50 μ m, suggesting that M. aeruginosa has relatively high affinity for environmental dissolved inorganic carbon(DIC). The change of temperature had little effect on K0.5(DIC) of M.aeruginosa indicated that the ability of utilizing inorganic carbon of M.aeruginosa was not influenced by the temperature within certain range. With the rising of the medium pH, K0.5(DIC) of M.aeruginosa FACHB905 and M.aeruginosa PCC7806 increased while that of M.aeruginosa FACHB469 decreased. K0.5(DIC) of M.aeruginosa did not change when AZ or EZ was added to the medium. The responses of photosynthetic oxygen evolution of M.aeruginosa and Chlamydomon as reinhardtii under conditions of different pH value and addition of carbonic anhydrase inhibitors were also compared in this paper. The results showed that the photosynthetic oxygen evolution of C. reinhardtii decreased with the rising of pH value from 7.0 to 9.0 and was suppressed by both of AZ and EZ. K0.5(DIC) of C. reinhardtii also decreased with the rising of the medium pH and under the treatment of AZ or EZ. Key words:Microcystis aeru
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    • References (33)
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