Localization of Carbonic Anhydrase in Mesophyll Cells of Terrestrial C_3 Plants in Relation to CO_2 Assimilation
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概要
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The activity and intracellular compartmentation of carbonic anhydrase was examined in mesophyll protoplasts of several C_3 terrestrial species including wheat, since this enzyme may facilitate diffusion of inorganic carbon in solution by converting CO_2 to bicarbonate. Carbonic anhydrase was located in the mesophyll chloroplast with little or no activity in the cytosolic fraction. In wheat, carbonic anhydrase was absent in etiolated leaves and increased in the light during greening. Thus the enzyme may have a role in photosynthesis in the chloroplast but not in the cytosol of mesophyll cells of higher C_3 plants. The amount of CO_2 required for half maximum rates of photosynthesis (under low O_2) was about two-fold higher for isolated protoplasts than with isolated chloroplasts of wheat. The form of inorganic carbon taken up by protoplasts, like that of chloroplasts, is CO_2. The results are discussed in relation to a possible resistance to CO_2 transfer in the cytosol of mesophyll cells.
- 日本植物生理学会の論文
著者
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Miyachi Shigetoh
Institute of Applied Microbiology, University of Tokyo
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Tsuzuki Mikio
Institute Of Applied Icrobiology University Of Tokyo
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Edwards Gerald
Botany Department And Institute Of Biological Chemistry Washington State University
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Miyachi Shigetoh
Institute Of Applied Microbiology Univcrsity Of Tokyo
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Miyachi Shigetoh
Institute Of Applied Icrobiology University Of Tokyo
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Miyachi Shigetoh
Institutc Of Applied Microbiology University Of Tokyo
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