Variation in nitrogen use efficiency among soft red winter wheat genotypes

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.