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Plant and Cell Physiology, 1985, Vol. 26, No. 3 543-549
© 1985

Article

Effects of Temperature and CO2 Concentration on Induction of Carbonic Anhydrase and Changes in Efficiency of Photosynthesis in Chlorella vulgaris 11h

Yoshihiro Shiraiwa1 and Shigetoh Miyachi2,2

1 Department of Biology, Faculty of Science, Niigata University Niigata 950-21, Japan
2 Institute of Applied Microbiology, University of Tokyo Bunkyo-ku, Tokyo 113, Japan

2 To whom requests for reprints should be addressed

The increase in carbonic anhydrase (CA) activity and the decrease in apparent Km(CO2) for photosynthesis induced by reducing CO2 concentration during the growth of Chlorella vulgaris 11h cells were followed under different temperatures. Both changes were accelerated by raising the temperature and reached an optimum at 32–37°C. When the CO2 concentration was lowered from 3 to 0.04%, the rate of photosynthetic O2 evolution at limiting CO2 concentrations increased and reached a stationary level after 3 h. Under such conditions, the concentration of CO2 dissolved in the algal suspension decreased logarithmically (t1/2=10 min) and reached a concentration in equilibrium with 0.04% CO2 in air after ca. 2 h.

When high-CO2 cells grown with 3% CO2 in air were transferred to various lower CO2 concentrations, CA activity and apparent Km(CO2) for photosynthesis changed depending on the CO2 concentration. The CO2 concentration which gives one-half the maximum value for Km(CO2) and one-half minimum value foi CA activities was about 0.5%. The inverse relationship observed for the changes in CA activity and the affinity for CO2 in photosynthesis supports the theory that CA loweres the apparent Km(CO2) for photosynthesis in Chlorella vulgaris 11h.

(Received August 27, 1984; Accepted February 8, 1985)
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