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Variation in nitrogen use efficiency among soft red winter wheat genotypes.

D A Van Sanford1, C T Mackown

  • 1Department of Agronomy, University of Kentucky, 40546-0091, Lexington, KY, USA.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|November 20, 2013
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Summary

Researchers studied nitrogen use efficiency (NUE) in soft red winter wheat. Nitrogen uptake efficiency significantly impacts NUE for both yield and protein, highlighting its importance in wheat breeding.

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Area of Science:

  • Agronomy
  • Plant Science
  • Genetics

Background:

  • Nitrogen use efficiency (NUE) is critical for sustainable agriculture and crop productivity.
  • Understanding genotypic variation in NUE is essential for improving wheat yields and nitrogen management.

Purpose of the Study:

  • To evaluate nitrogen use efficiency (NUE) in 25 soft red winter wheat genotypes.
  • To identify key factors contributing to genotypic differences in NUE, including nitrogen uptake efficiency and nitrogen harvest index.

Main Methods:

  • Field experiments were conducted over two years at a single location.
  • Nitrogen use efficiency (NUE), nitrogen uptake efficiency, nitrogen harvest index, and grain yield were measured.
  • Path coefficient analysis was used to determine the direct and indirect effects of various factors on NUE.

Main Results:

  • Significant genotypic variation was found for NUE, nitrogen harvest index, and grain yield.
  • Nitrogen uptake efficiency explained 54% of the genotypic variation in NUE for yield and 72% for protein.
  • Path analysis indicated a strong direct effect of nitrogen uptake efficiency on NUE.

Conclusions:

  • Nitrogen uptake efficiency is a major determinant of nitrogen use efficiency (NUE) in soft red winter wheat.
  • Breeding for enhanced nitrogen uptake efficiency could significantly improve wheat's NUE for both grain yield and protein content.