Abstract
Bean leaves were supplied 14CO2 in light or darkness. After a brief flush, the total and specific radioactivity of respired CO2 were measured when leaves were kept in light or darkness either in air or in CO2-free air. Changes in the specific radioactivity of respired CO2 show that photorespiration and dark respiration are different processes having different and separate substrates. Little, if any, CO2 production by the process of photorespiration could be detected in darkness. The process of dark respiration was about 75% suppressed in light. Measurements of ATP levels in light or darkness and in air or CO2-free air suggest that dark respiration is controlled by photosynthetically produced ATP. This is supported by the fact that isolated intact spinach chloroplasts transfer most of their photosynthetically produced ATP to the medium.
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