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Metabolism and Enzymology

Variations in the Alternative Oxidase in Chlamydomonas Grown in Air or High CO₂¹

Department of Biochemistry, Michigan State University, East Lansing, Michigan 48824

Chlamydomonas in the resting phase of growth has an equal capacity of about 15 micromole O₂ uptake per hour per milligram of chlorophyll for both the cytochrome c, CN-sensitive respiration, and for the alternative, salicylhydroxamic acid-sensitive respiration. Alternative respiration capacity was measured as salicylhydroxamic acid inhibited O₂ uptake in the presence of CN, and cytochrome c respiration capacity as CN inhibition of O₂ uptake in the presence of salicylhydroxamic acid. Measured total respiration was considerably less than the combined capacities for respiration. During the log phase of growth on high (2-5%) CO₂, the alternative respiration capacity decreased about 90% but returned as the culture entered the lag phase. When the alternative oxidase capacity was low, addition of salicylic acid or cyanide induced its reappearance. When cells were grown on low (air-level) CO₂, which induced a CO₂ concentrating mechanism, the alternative oxidase capacity did not decrease during the growth phase. Attempts to measure in vivo distribution of respiration between the two pathways with either CN or salicylhydroxamic acid alone were inconclusive.

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