Influence of Growth Conditions on the Enhancement of Photophosphorylation by Carbon Dioxide

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Abstract
Chloroplasts isolated from oats (Avena sativa, var. Garry) grown under a pale yellow filter show a CO2, enhancement of photophosphorylation similar to that in chloroplasrs from winter-grown oats. This finding accounts for the previously described seasonal effect. With chloroplasts from yellow filter-grown plants the pyocyanine, flavinemononucleotide and ferricyanide Hill reaction phosphorylations were all enhanced by CO2. These results are consistent with the hypothesis that CO enhances the formation of a high energy intermediate in photophosphorylation. Organic acids were also found to affect phosphorylation rates independent of CO2- This latter effect remains unexplained.

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