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Plant and Cell Physiology, 1977, Vol. 18, No. 2 347-352
© 1977

Article

Effects of CO2 concentration during growth on subsequent photosynthetic CO2 fixation in Chlorella1

Daisuke Hogetsu2,4 and Shigetoh Miyachi2,3

2 Radioisotope Centre, University of Tokyo Tokyo, Japan
3 Institute of Applied Microbiology, University of Tokyo Tokyo, Japan
4 Tokyo Metropolitan Isotope Research Centre Tokyo, Japan

1 Requests for reprints should be addressed to S. Miyachi, Radioisotope Centre, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

The maximum rate of photosynthetic 14CO2 fixation (Vmax) as well as the concentration of CO2 at which the rate of photosynthetic 14CO2 fixation attains one-half its maximum velocity (Km) in Chlorella vulgaris 11h cells was strongly dependent on the concentration of CO2 continuously provided during the algal growth.

The Vmax (µmoles 14CO2 fixed/ml pcv·min) and Km (% CO2) of the algal cells which had been grown in air containing 4% CO2 (by volume) were ca. 10 and 0.15–0.17, while those in the cells which had been grown in ordinary air (containing 0.04% CO2) were 7 and 0.05–0.06, respectively.

When the concentration of CO2 in the bubbling gas was lowered from 4 to 0.04% during the algal growth, their photosynthetic kinetics attained the respective lower steady levels after 5–10 hr. On the other hand, when the photosynthetic kinetics were determined 24 hr after raising the concentration of CO2 from 0.04 to 4%, the Vmax and Km-values were found to have already attained the respective higher levels.

(Received October 15, 1976; )
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