Massive Inorganic Carbon Cycling in Cyanobacteria Geared to the Energy Transfer to PSII

  • D. Tchernov
  • N. Keren
  • M. Hess
  • M Ronen-Tarazi
  • B. Luz
  • A. Kaplan
Chapter

Abstract

Light energy-dependent mechanisms which raises the concentration of CO2 at the carboxylating sites (CCM) have been recognized in many photosynthetic microorganisms [1]. We have followed CO2 and HCO3- fluxes associated with the CCM in several photosynthetic organisms. Sustained net CO2 efflux was observed during net photosynthesis in certain marine organisms including the cyanobacterium Synechococcus sp. WH7803 [2] and Nannochloropsis sp. [3]. This efflux resulted from HCO3- uptake and interacellular conversion to CO2, part of which leaked and raised its concentration in the cell vicinity. On the other hand, the steady state [CO2] near photosynthesizing microorganisms, including the fresh water Synechococcus sp. PCC 7942, is often lower than expected at CO2/HCO3- chemical equilibrium [4], a phenomena attributed to CO2 uptake and fixation during photosynthesis.

Key words

CO2-concentrating mechanism Cyanobacteria 

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Copyright information

© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • D. Tchernov
    • 1
  • N. Keren
    • 1
  • M. Hess
    • 1
  • M Ronen-Tarazi
    • 1
  • B. Luz
    • 1
  • A. Kaplan
    • 1
  1. 1.The Avron-Evenari Minerva CenterThe Hebrew University of JerusalemIsrael

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