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Glycolate Excretion and the Oxygen to Carbon Dioxide Net Exchange Ratio during Photosynthesis in Chlamydomonas reinhardtii¹

Department of Plant Biology, Carnegie Institution of Washington, Stanford, California 94305

Chlamydomonas reinhardtii cells were grown in high (5% v/v) or low (0.03% v/v) CO₂ concentration in air. O₂ evolution, HCO₃^– assimilation, and glycolate excretion were measured in response to O₂ and CO₂ concentration. Both low- and high-CO₂-grown cells excrete glycolate. In low-CO₂-grown cells, however, glycolate excretion is observed only at much lower CO₂ concentrations in the medium, as compared with high-CO₂-adapted cells. It is postulated that the activity of the CO₂-concentrating mechanism in low-CO₂-grown cells is responsible for the different dependence of glycolate excretion on external CO₂ concentration in low- versus high-CO₂-adapted cells.

The O₂/CO₂ net exchange ratio is dependent on the CO₂ concentration in the medium and is linearly dependent on the fraction of glycolate excreted per CO₂ taken up. Glycolate excretion, however, is too low to account for the deviation of the O₂/CO₂ net exchange ratio from unity.

¹ This is Carnegie Institution of Washington Publication No. 711.

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				D. T. Hanson, L. A. Franklin, G. Samuelsson, and M. R. Badger The Chlamydomonas reinhardtii cia3 Mutant Lacking a Thylakoid Lumen-Localized Carbonic Anhydrase Is Limited by CO2 Supply to Rubisco and Not Photosystem II Function in Vivo Plant Physiology, August 1, 2003; 132(4): 2267 - 2275. [Abstract] [Full Text] [PDF]