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Plant and Cell Physiology, 1985, Vol. 26, No. 6 1199-1203
© 1985

Short Communication

Variation of Phosphoenolpyruvate Carboxylase Activity in Dunaliella Associated with Changes in Atmospheric CO2 Concentration

Katsunori Aizawa1, Yasunori Nakamura2 and Shigetoh Miyachi1,2

1 Institute of Applied Microbiology, University of Tokyo Bunkyo-ku, Tokyo 113, Japan
2 Radioisotope Centre, University of Tokyo Bunkyo-ku, Tokyo 113, Japan

In Dunaliella tertiolecta, D. bioculata and D. viridis the activities of phosphoenolpyruvate carboxylase and carbonic anhydrase were higher in the cells grown in ordinary air (low-CO2 cells) than in those grown in air enriched with 1–5% CO2 (high-CO2 cells), whereas in Porphyridium cruentum R-1 there was no difference in phosphoenolpyruvate carboxylase activity between these two types of cells. Apparent Km(NaHCO3) values for photosynthesis in low-CO2 cells of all species tested were smaller than those in high-CO2 cells. Most of the 14C was incorporated into 3-phosphoglycerate, sugar mono- and di-phosphates during the initial periods of photosynthetic NaH14CO3 indicating that both types of cells in D. tertiolecta are C3 plants.

(Received May 27, 1985; Accepted June 25, 1985)
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