A correlation between changes in luminescence decay kinetics and the appearance of a CO2-accumulating mechanism in Scenedesmus obliquus |
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Authors: | Kristin Palmqvist Lars-Göran Sundblad Göran Samuelsson Erik Sundbom |
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Affiliation: | (1) Department of Plant Physiology, University of Umeå, S-901 87 Umeå, Sweden |
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Abstract: | In experiments with the unicellular green algae Scenedesmus obliquus a correlation was found between the presence of the CO2-accumulating mechanism and the appearance of polyphasic luminescence decay kinetics. A potentiometric titration method was used to measure and calculate photosynthetic carbon uptake.Polyphasic luminescence decay kinetics was found when the algae showed photosynthetic characteristics typical of algae adapted to low-CO2 conditions. When high-CO2 grown algae were transferred to low-CO2 conditions they gradually developed polyphasic decay kinetics during the first 25–30 minutes. When low-CO2 grown algae were transferred to high-CO2 conditions the polyphasic decay kinetics disappeared. To account for these results a working hypothesis is presented on the basis of the energy requirement for a CO2-accumulating mechanism. |
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Keywords: | CO2-accumulation luminescence photosynthesis Scenedesmus obliquus |
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