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Articles

Photosynthesis and Photorespiration in Whole Plants of Wheat

¹ Département de Biologie, Service de Radioagronomie, C.E.N. Cadarache Boîte Postale 1, No. 13115 Saint-Paul-Lez-Durance, France

Wheat was cultivated in a small phytotronic chamber. ¹⁸O₂ was used to measure the O₂ uptake by the plant, which was recorded simultaneously with the O₂ evolution, net CO₂ uptake, and transpiration. At normal atmospheric CO₂ concentration, photorespiration, measured as O₂ uptake, was as important as the net photosynthesis. The level of true O₂ evolution was independent of CO₂ concentration and stayed nearly equal to the sum of net CO₂ photosynthesis and O₂ uptake. We conclude that at a given light intensity, O₂ and CO₂ compete for the reducing power produced at constant rate by the light reactions of photosynthesis.

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