An incoherent feed-forward loop coordinates nitrate uptake and tillering in wheat

Area of Science:

• Plant Molecular Biology
• Agricultural Science
• Genetics

Background:

• Nitrogen fertilization boosts wheat yields, but gains are stagnating.
• Excessive nitrogen impairs nitrogen use efficiency by promoting nonproductive tillers.
• Balancing nitrogen uptake and tillering in wheat is a persistent challenge.

Purpose of the Study:

• Investigate the role of TaNLP3 in nitrate signaling and its impact on wheat yield.
• Elucidate the regulatory mechanisms controlling nitrate uptake and tiller formation.
• Identify genetic resources for enhancing nitrogen use efficiency in wheat.

Main Methods:

• Investigated TaNLP3 as a master regulator of nitrate signaling.
• Analyzed the interaction of TaNLP3 with the SWI/SNF complex.
• Examined temporal transcriptional cascades regulating nitrate uptake and tillering.

Main Results:

• TaNLP3 fine-tunes nitrate uptake and tiller formation via chromatin accessibility.
• Short-term signaling: TaNLP3 activates nitrate uptake genes (e.g., TaNRT2.1).
• Long-term signaling: TaNLP3 induces TaLBD38, repressing TaNRT2.1 and promoting tillering.
• Identified elite haplotypes (TaNLP3-3B, TaLBD38-4A, TaNRT2.1-6B4) for higher yields.

Conclusions:

• TaNLP3 dynamically coordinates nitrate uptake and tillering under varying nitrogen conditions.
• Findings offer resources for breeding wheat with improved nitrogen use efficiency.
• Understanding this regulatory network is key to enhancing wheat productivity.