The allele TaNPF7.6-A1mod increases nitrate transport and is linked to more efficient nitrogen use in wheat.
Using candidate-gene studies and genome-wide association studies, researchers identified TaNPF7.6-A1mod as a form of the TaNPF7.6-A1 gene that promotes nitrogen use efficiency in wheat. Compared with another form, TaNPF7.6-A1lan, the allele was expressed at a higher level and had greater nitrate transport activity.
The researchers also described a regulatory pathway involving three proteins: TaEIL3, TaJAZ1 and TaNPF7.6-A1. They report that TaNPF7.6-A1mod interacts more strongly with TaJAZ1, affecting where TaJAZ1 is located in the cell and how it regulates the gene. The allele has become concentrated in some geographical regions and shows signs of continued selection during wheat breeding.
How the wheat allele works
TaNPF7.6-A1mod was identified as a positive regulator of nitrogen use efficiency in wheat. It produces higher gene activity and greater nitrate transport than TaNPF7.6-A1lan, resulting in greater nitrogen use efficiency and increased grain yield.
The study proposes a mechanism in which TaNPF7.6-A1mod interacts with TaJAZ1 more strongly than TaNPF7.6-A1lan. This interaction promotes retention of TaJAZ1 in the cell’s fluid interior rather than its nucleus. TaJAZ1 interacts with TaEIL3 and represses it; TaEIL3 can bind to the promoter region of TaNPF7.6-A1, influencing how the allele is expressed. The researchers also found that TaNPF7.6-A1mod has a significant pattern of geographical clustering and has undergone ongoing positive selection during breeding.
Why nitrogen efficiency matters
Nitrogen fertilizer supports wheat production but can raise costs and contribute to environmental pollution when it is not taken up efficiently. A wheat allele that improves nitrogen use efficiency and grain yield could provide a target for breeding varieties that make better use of available nitrogen.
The findings identify both a gene variant and regulatory factors that breeders may be able to use when selecting for this trait. However, the abstract does not show how much fertilizer use could be reduced, so the work does not by itself demonstrate a specific fertilizer-saving strategy.
Evidence and caveats
The researchers combined candidate-gene analysis, genome-wide association studies, measurements of gene expression and nitrate transport, protein-interaction experiments, and evolutionary analysis. Together, these approaches support a role for TaNPF7.6-A1mod in nitrogen use efficiency and describe a possible regulatory mechanism.
The abstract does not report sample sizes, specific yield increases, field conditions, or the amount of fertilizer used. It also does not establish whether the allele performs consistently across wheat varieties, environments, or farming systems, or how much fertilizer farmers could reduce while maintaining yields.
// Source
Nature Communications · 2026 · DOI: 10.1038/s41467-026-76836-2
Authors: Di Jiang, Chaojun Peng, Yan Li, Chen Gong, Yuhui Fang, Xingyu Zhang, Zhaoyang Wang, Xinnan Wang, Lin Hu, Xueli Qi, Weigang Xu
Institutions: Henan Agricultural University, Henan Academy of Agricultural Sciences
