Effects of Temperature and CO_2 Concentration on Induction of Carbonic Anhydrase and Changes in Efficiency of Photosynthesis in Chlorella vulgaris 11h

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The increase in carbonic anhydrase (CA) activity and the decrease in apparent K_m(CO_2) for photosynthesis induced by reducing CO_2 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℃. When the CO_2 concentration was lowered from 3 to 0.04%, the rate of photosynthetic 02 evolution at limiting CO_2 concentrations increased and reached a stationary level after 3h. Under such conditions, the concentration of CO_2 dissolved in the algal suspension decreased logarithmically (t_<1/2> = 10 min) and reached a concentration in equilibrium with 0.04% CO_2 in air after ca. 2h. When high-CO_2 cells grown with 3% CO_2 in air were transferred to various lower CO_2 concentrations, CA activity and apparent K_m(CO_2.) for photosynthesis changed depending on the CO_2 concentration. The CO_2 concentration which gives. one-half the maximum value for K_m(CO_2) and one-half minimum value for CA activities was about 0.50%. The inverse relationship observed for the changes in CA activity and the affinity for CO_2 in photosynthesis supports the theory that CA loweres the apparent Km_(CO_2) for photosynthesis in Chlorella vulgaris 11 h.
日本植物生理学会の論文
1985-04-00