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Metabolism and Enzymology

Nitrate-Dependent O₂ Evolution in Intact Leaves ¹

Departamento de Biología Vegetal y Ecología, Universidad de Sevilla-CSIC, Apdo. 1095, 41080-Sevilla, Spain, Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla-CSIC, Apdo. 1095, 41080-Sevilla, Spain

Evolution of O₂ by illuminated intact detached leaves from barley (Hordeum vulgare L. cv Athos) and pea (Pisum sativum L. cv Lincoln) in a CO₂-saturating atmosphere was enhanced when KNO₃ (1-2.5 millimolar) had been previously supplied through the transpiration stream. The extra O₂ evolution observed after feeding KNO₃ increased with the light intensity, being maximal at near saturating photon flux densities and resulting in no changes in the initial slope of the O₂ versus light-intensity curve. No stimulation of O₂ evolution was otherwise observed after feeding KCl or NH₄Cl. The data indicate that nitrate assimilation uses photosynthetically generated reductant and stimulates the rate of non-cyclic electron flow by acting as a second electron-accepting assimilatory process in addition to CO₂ fixation.

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