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Major Gene Control of Nitrate Reductase Activity in Common Wheat¹

Two high-yielding, short-statured spring wheats (Triticum aestivum L.), ‘Anza’ and ‘UC 44-111,’ differ in certain characteristics of N metabolism. Nitrate reductase activity (NRA), measured in vitro on shoots or lamina of seedling plants, was about 8 and 18 µmoles of nitriteproduced/hour/g fresh weight for Anza and UC 44-111, respectively. The genetic basis for this difference was investigated with an in vitro NRA assay on seedling plants to determine the NRA frequency distributions of parents, F₁, F₂, reciprocal BCF₂ and randomly derived F₆ lines. All data were consistent in showing that UC 44-111 has a single dominant gene (Nra) which accounted for most of the variability observed for NRA.

Key Words: Triticum aestivum L. • Nitrate metabolism • Gene regulation

² Assistant professor, Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul (presently in Rabat, Morocco), postgraduate research agronomist and professors of agronomy. Univ. of California, Davis.

Received for publication March 19, 1980.