Studies on photosynthetic phosphorylation

The photochemical esterification of inorganic phosphate into adenosine triphosphate by chloroplasts was investigated under anaerobic conditions in the presence of either vitamin K3 or flavin mononucleotide. Evidence is presented in support of the conclusion that vitamin K3 and flavin mononucleotide are involved in separate pathways for photosynthetic phosphorylation. A tentative scheme for the generation of adenosine triphosphate in chloroplasts, consistent with this conclusion, is given.