Effects of prior environmental conditions on the subsequent uptake and release of carbon dioxide in the light

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Abstract
Rates of uptake and simultaneous evolution of carbon dioxide in the light were measured on leaves from various plants by a 14CO2–12CO2 technique under standardized conditions. The measurements were made on leaves from rice, potato, and carrot plants grown under conditions of long or short days combined with high or low night temperatures. The rates of uptake and release of carbon dioxide in the light, and the relationships between them, were affected by the prior conditions that obtained during growth (day length and night temperature), by the age of the leaves, and by the developmental stage of the plants. Since the total uptake of carbon dioxide and its release in the light did not always respond to these variables to the same extent, or even in the same direction, the effectiveness of photosynthesis was often markedly affected. The implications of these observations are, therefore, discussed.

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