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Plant Physiology 83:933-937 (1987)
© 1987 American Society of Plant Biologists

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Environmental and Stress Physiology

An Evaluation of the Recycling in Measurements of Photorespiration

Alain Gerbaud and Marcel Andre

Laboratoire de Chimie Biologique et de Photophysiologie, INRA 78850 Thiverval-Grignon, France, Service de Radioagronomie, Centre d'Etudes Nucléaires de Cadarache, BP 1, 13108 Saint Paul lez Durance, France

All measurements of photorespiration and gross photosynthesis in leaves, whether using isotopes or not, are underestimated because of the recycling of O2 or CO2. On the basis of a simple diffusion model, we propose a method for the calculation of the recycling and the corresponding underestimation of the measurements. This procedure can be applied when the stomatal resistance is known, and allows for a correction of certain results in the literature. It is found that measurements of the photorespiratory CO2 release are usually underestimated by 20 to 100%, which sets the estimated rate of CO2 photorespired at 30 to 50% of the net photosynthesis in C3 plants under normal conditions. In water stress studies, the correction of the photorespiration is still more important (1.5-3.3) because the stomata are closed more. Analysis of the diffusion of O2 shows that its recycling is low and that the underestimation of photorespiration with 18O2 is negligible.




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Copyright © 1987 by the American Society of Plant Biologists