Abstract
We have assessed the effect of vanadate as an inhibitor of plasma-membrane ATPase on photosynthesis and the ATP/ADP ratio in Chlamydomonas reinhardtii CW-92 (a mutant strain lacking a cell wall). This effect was compared in low-CO2-adapted cells grown in media bubbled with air containing 400 or 70 μL · L−1 CO2. Evidence is presented indicating that cells grown at 70 μL · L−1 CO2 have a higher rate of photosynthetic O2 evolution than cells grown at 400 μL · L−1 CO2, at limiting carbon concentrations. Extracellular and intracellular carbonic-anhydrase activities were, however, similar in cells grown in both of the low-carbon conditions. Vanadate inhibited, to a different extent, the HCO −3 -dependent O2 evolution in cells grown at 400 and 70 μL · L−1 CO2. At 400 μM vanadate, inhibition reached 70–75% in cells grown at 400 μL · L−1 but only 50% in those grown at 70 μL · L−1 CO2. The ATP/ADP ratios determined with and without vanadate at limiting concentrations of dissolved inorganic carbon indicated that more ATP was hydrolysed in algae grown at 70 μL · L−1 than in those grown at 400 μL · L−1 CO2. We conclude that the maximal capacity to accumulate dissolved inorganic carbon is inversely related to the CO2 concentration in the medium. Activation and — or synthesis of vanadate-sensitive ATPase may be the major explanation for the higher capacity for HCO −3 -dependent O2 evolution in cells grown under limited CO2 concentrations.
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Abbreviations
- CA:
-
carbonic anhydrase
- DIC:
-
dissolved inorganic carbon
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We are grateful to Prof. J Cardenas (Dept de Bioquimica y Biologia Moleculary Fisiologia, University of Cordoba, Spain) and Prof. J.V. Moroney (Dept of Botany, Louisiana State University, USA) for critically reading the manuscript. We are also grateful to Gunilla Malmberg for expert assistance in the measurements of ATP/ADP ratios and Dr. C. Santos (The University of Cordoba, Spain) for skiful secretarial assistance. This work was supported by the Swedish Natural Research Council, Seth M. Kempes Memorial foundation and the Swedish Institute.
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Karlsson, J., Ramazanov, Z., Hiltonen, T. et al. Effect of vanadate on photosynthesis and the ATP/ADP ratio in low-CO2-adapted Chlamydomonas reinhardtii cells. Planta 192, 46–51 (1993). https://doi.org/10.1007/BF00198691
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DOI: https://doi.org/10.1007/BF00198691