ZmPT7 Regulates Nitrate Utilization in Maize by Interacting With ZmNRT2.2

Area of Science:

• Plant Molecular Biology
• Nutrient Transport Mechanisms
• Maize Genetics

Background:

• Nitrogen and phosphorus are crucial for plant development.
• Molecular mechanisms of nitrogen and phosphorus cross-talk in maize remain unclear.
• Understanding nutrient uptake is vital for crop adaptation.

Purpose of the Study:

• To identify genes involved in maize nitrate (NO₃^-) uptake.
• To elucidate the molecular mechanisms of nitrogen-phosphorus interaction in maize.
• To analyze the function of the phosphate transporter ZmPT7.

Main Methods:

• Reverse genetic screening of maize mutants sensitive to low nitrate.
• Data-independent acquisition (DIA)-based quantitative proteomics.
• Protein-protein interaction analysis and validation experiments.

Main Results:

• The phosphate transporter ZmPT7 gene was identified.
• ZmPT7 interacts with ZmNRT2.2, enhancing its protein abundance.
• This interaction modulates nitrate (NO₃^-) uptake under low nitrate conditions.

Conclusions:

• ZmPT7 plays a key role in maize adaptation to nitrate deficiency.
• The ZmPT7-ZmNRT2.2 interaction clarifies nitrogen-phosphorus cross-talk mechanisms.
• Findings offer insights for improving maize cultivation and nitrogen use efficiency.