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A Study of the Control of Glycolate Excretion in Chlorella¹

^a Department of Biology, York University, Downsview, Ontario M3J 1P3, Canada

Chlorella pyrenoidosa cells grown on 5% CO₂ excreted glycolate when incubated in light with 10 mM bicarbonate, but excreted no glycolate under the same conditions when they were maintained on air for 7 hours prior to the assay. Incubation of 5% CO₂-grown and air-grown cells with 10 mM isonicotinyl hydrazide or 10 mM -hydroxypyridinemethane sulfonate during the assay stimulated the excretion of glycolate by CO₂-grown cells severalfold that of air-grown cells.

Adaptation of CO₂-grown Chlorella to growth on air did not affect the levels of glycolate dehydrogenase in the cells and did not affect the rate of dark oxidation and metabolism of exogeneous ¹⁴C-glycolate by the cells. These results indicate that the lack of glycolate excretion by air-grown or air-adapted cells of Chlorella cannot be explained by a concomitant change in the level of glycolate dehydrogenase.

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