Consumption of O2 in the light by Chlorella pyrenoidosa and Chlamydomonas reinhardtii |
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Authors: | J S Bunt and M A Heeb |
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Institution: | Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Miami, Fla. 33149, U.S.A. |
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Abstract: | A mass spectrometer has been used to measure O2 production and consumption and net CO2 exchange near the CO2 compensation point in Chlorella pyrenoidosa and Chlamydomonas reinhardtii grown in air and in 2% (v/v) and 5% (v/v) CO2 in air. Some experiments were run in presence of -hydroxy-2-pyridinemethanesulfonic acid and, for others, data are presented from parallel assays for enzymic glycolate oxidation. Although the glycolate-oxidising enzyme was present in cells grown with and without CO2 enrichment, the activities measured were not compatible with direct measurements of O2 consumption in the light. This and other evidence argues against glycolate being the primary substrate for light-induced O2 consumption by these organisms. |
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