Glycolate Excretion and the Oxygen to Carbon Dioxide Net Exchange Ratio during Photosynthesis in Chlamydomonas reinhardtii1
AUTOR(ES)
Kaplan, Aaron
RESUMO
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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=425660Documentos Relacionados
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