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. 1981 Feb;67(2):229–232. doi: 10.1104/pp.67.2.229

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

Aaron Kaplan 1,2, Joseph A Berry 1
PMCID: PMC425660  PMID: 16661652

Abstract

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.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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