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Photosynthetic O 2 -evolution patterns were determined in cells of Chlorella vulgaris 211 - 11 h, grown under air enriched with 2% CO 2  (High CO 2-  cells) and under ordinary air (Low CO 2 -cells). Oxygen evolution in these algae was measured as consequence of short saturating light flashes with the three electrode system according to Schmid and Thibault, Z. Naturforsch. 34c, 414 (1979). It was shown that Low CO 2 -cells had the usual Joliot-Kok pattern of O 2  evolution whereas High CO 2 -cells exhibited a more reduced pattern characterized by the fact that maximal flash yield was observed under the 4th flash and that damping due to misses was more important than in Low CO 2 -cells. Moreover, the amplitudes of the amperometric signals in High CO 2 -cells were consistently lower. The observations clearly speak in favor of a more reduced condition of the S-state system, when the cells are grown under high CO 2 . This was confirmed by the fact that higher concentrations of hydroxylamine had to be added to bring Low CO 2 -cells into the maximally reduced condition namely S -2 , than was the case with High CO 2 -cells. Our observations suggest that the redox condition of the S-state system of photosystem II in Chlorella vulgaris is affected either by changes of CO 2  concentrations during algal growth or that the S-state system is only maintained in the 4 state Kok condition when the enzyme carbonic anhydrase is present.

Effect of the CO 2 -Concentration during Growth on the Oxygen Evolution Pattern under Flash Light in Chlorella