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Articles

Effect of Carbon Dioxide on Photorespiration ¹

David Canvin^b

^a The Hebrew University of Jerusalem, Faculty of Agriculture, Department of Horticulture, Rehovot, P.O.B. 12, Israel, Department of Biology, Queens University, Kingston, Ontario K7L 3N6 Canada

The isotopic CO₂ technique for measuring photorespiration was shown to be a valid technique for measuring the unidirectional inward and outward fluxes of CO₂ from a sunflower (Helianthus annuus L.) leaf in the light. The rate of photorespiration was decreased little as the CO₂ concentration was increased from 20 to 1,150 microliters per liter. This finding contradicts the widely held assumption that photorespiration is suppressed at high CO₂ concentrations. Some discussion regarding this apparent conflict is presented.