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1. In intact leaves of Elodea densa illumination resulted in a large increase in the levels of chloroplastic and cytoplasmic ATP and a decrease in chloroplastic and cytoplasmic ADP. Reverse changes were observed on darkening. The kinetics of the fluctuations were similar in chloroplasts and cytoplasm suggesting effective transfer of ATP and ADP between chloroplasts and cytoplasm. Ratios of ATP to ADP were significantly lower in the chloroplasts than in the cytoplasm in the dark and in the light. This may indicate different phosphate potentials in chloroplasts and cytoplasm. Transfer of ATP across the chloroplast envelope as calculated from the light-dependent cytoplasmic ATP increase was 7 to 9 μmoles/mg chlorophyll per hour. Actual transfer rates are probably higher.

Direct and Indirect Transfer of ATP and ADP across the Chloroplast Envelope