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Plant Physiology 68:1237-1243 (1981)
© 1981 American Society of Plant Biologists

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Articles

In Vivo Determination of Parameters of Nitrate Utilization in Wheat (Triticum aestivum L.) Seedlings Grown with Low Concentration of Nitrate in the Nutrient Solution 1

Gianni R. Baer2 and Gérald F. Collet

Station Fédérale de Recherches Agronomiques de Changins, CH-1260, Nyon, Switzerland

Six genotypes of winter wheat (Triticum aestivum L.) differing in grain protein concentration were grown on a nutrient solution containing low concentrations of NO3– (2 millimolar). Total NO3– uptake varied between genotypes but was not related to grain protein content. An in vivo nitrate reductase assay was used to determine the affinity of the enzyme for NO3–, and large phenotypic variations were observed. In vivo estimations of the concentration and size of the metabolic pool were variable. However, the three genotypes with the higher ratios of metabolic pool size to leaf total NO3– concentration were the high protein varieties. It is proposed that a high affinity of nitrate reductase for nitrate might be a biochemical marker for the capacity of the plant to continue assimilating NO3– for a longer period during the last stage of growth.

The potential use of such physiological criteria as markers is discussed, in particular with respect to breeding programs for the development of plants with efficient nitrogen utilization.

2 Present address: Department of Agronomy, University of Wisconsin, Madison, WI 53706.

1 This research was supported in part by a special grant from Office du personnel de la Confédération pour stagiaires post-universitaires.






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Copyright © 1981 by the American Society of Plant Biologists