Changes in the Carbonic Anhydrase Activity and the Rate of Photosynthetic O_2 Evolution during the Cell Cycle of Chlorella ellipsoidea C-27
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概要
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Rhythmical changes in carbonic anhydrase activity(CA) and in photosynthesis were observed during the cell cycle of Chlorella ellipsoidea C-27 synchronized at various concentrations of dissolved CO_2 (dCO_2 with a regime of 16 h of light and 8 h of darkness. At a constant low concentration of dCO_2 (11 μM), intracellular CA activity showed obvious fluctuations with a peak at 8 h after the initiation of illumination, while extracellular CA activity, located on the cell surface, showed only minor fluctuations although the activity was as high as the maximum activity of intracellular CA. In contrast, obvious changes in the activities of intra- and extracellular CA activities were not observed at a high concentration of dCO_2 (520 μM). The ratio of photosynthetic activity at limiting versus saturating concentrations of dCO_2, which is indicative of the affinity of cells for CO_2, showed clear rhythmical changes during the cell cycle and the ratio was higher in low-CO_2 cells than in high-CO_2 cells. The changes in the ratio seemed to reflect the changes in CA activity. When the cells that had been synchronized under high CO_2 conditions were transferred to low CO_2 conditions at any given stage in the cell cycle, CA activity was induced in every case but the capacity for induction of CA was greater in young cells than in mature cells. This result suggests that the capacity of cells to induce CA over the course of the cell cycle is closely related to endogenous aging of the cell.
- 日本植物生理学会の論文
著者
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Shiraiwa Y
Univ. Tsukuba Ibaraki Jpn
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Hirokawa Toyoyasu
Department of Brology, Faculty of Science, Niigata University
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Shiraiwa Yoshihiro
Department Of Biochemistry Michigan State University:(present)department Of Biology Faculty Of Scien
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Hirokawa T
Graduate School Of Science And Technology Niigata University:department Of Biology Faculty Of Scienc
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Nara Mayumi
Graduate School Of Science And Technology Niigata University
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Nara Mayumi
Department of Biology, Faculty of Science. Niigata University
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Hirokawa Toyoyasu
Department Of Biology Faculty Of Science Niigata University
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