Variation of Phosphoenolpyruvate Carboxylase Activity in Dunaliella Associated with Changes in Atmospheric CO2 Concentration |
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Authors: | Aizawa, Katsunori Nakamura, Yasunori Miyachi, Shigetoh |
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Affiliation: | 1 Institute of Applied Microbiology, University of Tokyo Bunkyo-ku, Tokyo 113, Japan 2 Radioisotope Centre, University of Tokyo Bunkyo-ku, Tokyo 113, Japan |
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Abstract: | In Dunaliella tertiolecta, D. bioculata and D. viridis the activitiesof phosphoenolpyruvate carboxylase and carbonic anhydrase werehigher in the cells grown in ordinary air (low-CO2 cells) thanin those grown in air enriched with 15% CO2 (high-CO2cells), whereas in Porphyridium cruentum R-1 there was no differencein phosphoenolpyruvate carboxylase activity between these twotypes of cells. Apparent Km(NaHCO3) values for photosynthesisin low-CO2 cells of all species tested were smaller than thosein high-CO2 cells. Most of the 14C was incorporated into 3-phosphoglycerate,sugar mono- and di-phosphates during the initial periods ofphotosynthetic NaH14CO3 indicating that both types of cellsin D. tertiolecta are C3 plants. (Received May 27, 1985; Accepted June 25, 1985) |
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