Form of Inorganic Carbon Utilized for Photosynthesis in Chlamydomonas reinhardtii1 |
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Authors: | Imamura Machiko; Tsuzuki Mikio; Shiraiwa Yoshihiro; Miyachi Shigetoh |
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Institution: | 2Institute of Applied Microbiology, University of Tokyo Bunkyo-ku, Tokyo 113, Japan
4Radioisotope Centre, University of Tokyo Bunkyo-ku, Tokyo 113, Japan |
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Abstract: | The effect of carbonic anhydrase (CA) on time courses of photosynthetic14C incorporation in the presence of 14CO2 or NaH14CO3 was studiedwith cells of Chlamydomonas reinhardtii which had been grownunder ordinary air (low-CO2 cells) or air enriched with 4% CO2(high-CO2 cells). Experimental data obtained at 20°C andpH 8.0 suggested that the major form of inorganic carbon utilizedby high-CO2 cells was CO2, while that utilized by low-CO2 cellswas HCO3. The cell suspension showed CA activity which was comparableto that observed in the sonicate of cells. Both activities werehigher in low-CO2 cells than in high-CO2 cells. The mechanism by which HCO3 is utilized by low-CO2 cellsof C. reinhardtii is discussed.
3Present address: Department of Biology, Faculty of Science,University of Niigata, Niigata 950-21, Japan. (Received August 4, 1982; Accepted January 19, 1983) |
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