Effects of temperature and CO2 concentration on photosynthetic CO2 fixation by Chlorella

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Abstract
The rates of photosynthetic 14CO2 fixation by Chlorella vulgaris llh, grown under high CO2, were determined between 4 to 37°C with air containing from 300 to 13,000 ppm 14CO2. When the CO2 level was increased, both the rate of photosynthesis and the optimum temperature for maximum photosynthesis increased. The maximum photosynthetic rate was reached at 12°C with 300 ppm l4CO2. Among the photosynthetic products fromed at 300 ppm 14CO2, glycolate decreased greatly when the temperature was raised from 20 to 30°C. At 3,000 ppm 14CO2 an insignificant amount of glycolate was formed at all temperatures, whereas 14C-incorporation into the insoluble fraction, sucrose, and the lipid fraction was significantly higher than at 300 ppm 14CO2. The 14C in sucrose was greatly increased and the radioactivity in the insoluble fraction decreased when the temperature was raised from 28 to 36°C.

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