Distinction between HCO3−‐ and CO2‐dependent photosynthesis in the cyanobacterium Synechococcus leopoliensis based on the selective response of HCO3− transport to Na+
- 22 July 1985
- journal article
- Published by Wiley in FEBS Letters
- Vol. 187 (1) , 29-32
- https://doi.org/10.1016/0014-5793(85)81207-2
Abstract
At low concentrations of dissolved inorganic carbon (DIC) at pH 8.0 the rates of DIC transport and fixation by Synechococcus leopoliensis were markedly stimulated by the addition of Na+ Carbonic anhydrase (CA) addition gave similar results. The Na+‐stimulated photosynthesis was inhibited by Li+ whereas the CA‐stimulated photosynthesis was not. The addition of a high DIC concentration (1 mM) overcame the need for either Na+ or CA. We suggest that Na+ stimulated HCO3 − transport whereas CA stimulated CO2 transport (by increasing the supply rate of CO2 to the cells).Keywords
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