Adenylate ratios in the cytosol,chloroplasts and mitochondria of barley leaf protoplasts during photosynthesis at different carbon dioxide concentrations |
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Affiliation: | Department of Plant Physiology, University of Umeå, S-907 87 Umeå, Sweden |
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Abstract: | Barley (Hordeum vulgare) protoplasts were incubated in darkness and in the light at saturating and limiting CO2 concentrations. The protoplasts were fractioned by a membrane filtration technique which allows quenching of the metabolism by acidification within about 0.1 s and the ATP/ADP ratios in the cytasol, chloroplasts and mitochondria were determined. It is concluded that the cytosolic ATP/ADP ratio is considerably higher during photosynthesis at limiting CO2 (which is the normal situation for a C3 plant in air) compared to photosynthesis at saturating CO2 or darkness. |
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