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Plant Physiology 86:166-175 (1988)
© 1988 American Society of Plant Biologists

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Metabolism and Enzymology

Nitrogen Uptake by Wheat Seedlings, Interactive Effects of Four Nitrogen Sources: NO3–, NO2–, NH4+, and Urea 1

Richard S. Criddle, Michael R. Ward and Ray C. Huffaker

Department of Biochemistry and Biophysics, University of California, Davis, CA 95616, Plant Growth Laboratory and Department of Agronomy and Range Science, University of California, Davis, CA 95616

The net influx (uptake) rates of NO3–, NH4+, NO2–, and urea into roots of wheat (Triticum aestivum cv Yecora Rojo) seedlings from complete nutrient solutions containing all four compounds were monitored simultaneously. Although urea uptake was too slow to monitor, its presence had major inhibitory effects on the uptake of each of the other compounds. Rates of NO3–, NH4+, and NO2– uptake depended in a complex fashion on the concentration of all four N compounds. Equations were developed which describe the uptake rates of each of the compounds, and of total N, as functions of concentrations of all N sources. Contour plots of the results show the interactions over the range of concentrations employed. The coefficients of these equations provide quantitative values for evaluating primary and interactive effects of each compound on N uptake.

1 This work was supported in part by a grant from the United States National Aeronautics and Space Agency (NASA NCC-2-99).




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P. Merigout, M. Lelandais, F. Bitton, J.-P. Renou, X. Briand, C. Meyer, and F. Daniel-Vedele
Physiological and Transcriptomic Aspects of Urea Uptake and Assimilation in Arabidopsis Plants
Plant Physiology, July 1, 2008; 147(3): 1225 - 1238.
[Abstract] [Full Text] [PDF]


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Copyright © 1988 by the American Society of Plant Biologists