Plant Physiol. Drug Metab Dispos
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Plant Physiology 64:735-738 (1979)
© 1979 American Society of Plant Biologists

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Articles

Photosynthesis and Photorespiration in Whole Plants of Wheat

Alain Gerbaud and Marcel Andre

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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Copyright © 1979 by the American Society of Plant Biologists