Effects of Temperature on Photosynthesis and CO2 Evolution in Light and Darkness by Green Leaves 1

AUTOR(ES)

Hew, Choy-Sin

RESUMO

Using an open and a closed system of gas analysis, it was found that CO2 evolution in light and in darkness from plant leaves (sunflower, soybean, watermelon, eggplant, and jackbean) have a different response to temperature. While the rate of CO2 evolution in light increased with increasing temperature from 17 to 35° and then declined, the rate of CO2 evolution in darkness increased continuously up to 40°. The rate of CO2 evolution in light was affected by light intensity. At 1800 ft-c and below 35° the rate of CO2 evolution in light was greater than in darkness, but above 35° it became lower than in darkness. The Q10 for CO2 evolution in light was consistently lower than that in darkness.

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