Abstract
The relationship between photosynthesis and photohydrogen evolution was investigated in a highly CO 2-tolerant strain of Chlorococcum littorale. Concentrations of 0.03% to 40% CO 2 were applied during growth of the cells. A concentraction of 5% CO 2 is the most favourable condition for growth, pigment formation and carbohydrate formation, all of which tail off towards a concentration of 40% CO 2. The same pattern was observed for oxygen evolution and photohydrogen evolution. The reason for the decline at high CO 2 concentrations was found in the partial inhibition of photosystem II (PS II). The initial rates of photohydrogen evolution were at least double those of O 2 evolution, demonstrating the higher affinity of the hydrogenase than the NADP-reductase to the electrons provided by the photosynthetic electron transport chain. CO 2 concentration had no influence on the in vitro activity of the hydrogenase.
Published Version
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