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Nitrate, nitrite and ammonia assimilation by leaves: Effect of light, carbon dioxide and oxygen

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The assimilation of nitrate, nitrite and ammonia in barley, wheat, corn and bean leaves was studied using 15N-labelled molecules and either leaf chamber experiments with the uptake of the nitrogen species in the transpiration stream, or vacuum-infiltration experiments. The assimilation of 15NO3 − into amino nitrogen was strictly dependent on light and ceased abruptly when the light was extinguished. If the leaves were exposed to air, CO2-free air or N2 there was no effect on the rate of NO3 − assimilation over 0.5 h. After 1.25 h of CO2-free air, NO3 − assimilation into amino acids was sharply reduced. Resupply of air at this time stimulated NO3 − assimilation and restored it to the rate observed in leaves exposed to air only. There was no recovery by tissue pretreated for 1.25 h in N2 and subsequently resupplied with air. Incorporation of 15NO2 − was also markedly dependent on light with little reduction occurring in the dark. Incorporation of 15NH4 + into amino acids was stimulated 5 fold by light but considerable incorporation occurred in the dark. The presence of 100 mM NO3 − had no effect on the rate of incorporation of 15NO2 − or 15NH4 +. Nitrite at 1 mM had no effect on 15NO3 − incorporation but at 10 mM inhibited it completely after 0.5 h. Ammonia at 1 mM had no effect on 15NO3 − or 15NO2 − incorporation and while 10 mM inhibited incorporation for 0.5 h this inhibition did not persist.

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Author notes

  1. D. T. Canvin

    Present address: Department of Biology, Queen's University, Kingston, Ontario, Canada

  2. C. A. Atkins

    Present address: Botany Department, University of Western Australia, 6009, Nedlands, Western Australia, Australia

Authors and Affiliations

  1. Seibersdorf Laboratory, International Atomic Energy Agency, A-1011, Vienna, Austria

    D. T. Canvin & C. A. Atkins

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Canvin, D.T., Atkins, C.A. Nitrate, nitrite and ammonia assimilation by leaves: Effect of light, carbon dioxide and oxygen. Planta 116, 207–224 (1974). https://doi.org/10.1007/BF00390228

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