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OsGSK2-OsTCP19 Module Integrates Nitrogen and Brassinosteroid Signaling to Regulate Nitrogen Utilization and Root

Yongqiang Liu^1,2, Weiwei Li³, Xiaohui Ma⁴

¹Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|March 15, 2026

Summary

This summary is machine-generated.

Nitrogen and brassinosteroid signaling in rice are directly linked by the OsGSK2-OsTCP19 module. This pathway regulates nitrogen utilization and lateral root development for improved plant plasticity.

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Area of Science:

Plant Biology
Molecular Signaling
Agricultural Science

Background:

Nitrogen (N) and brassinosteroids (BRs) are crucial for plant adaptation to nutrient availability.
The molecular mechanisms connecting N and BR signaling pathways are not fully understood.

Purpose of the Study:

To elucidate the direct molecular link between nitrate and brassinosteroid signaling in rice.
To understand how this interplay regulates nitrogen utilization and root development.

Main Methods:

Investigated nitrate-induced brassinosteroid response in rice (Oryza sativa L.).
Analyzed the role of OsTCP19 and OsGSK2 in mediating the crosstalk.
Examined gene expression and protein interactions using molecular and genetic approaches.

Main Results:

Nitrate activates BR signaling in a dose-dependent manner, enhancing N signaling and lateral root growth.
The OsGSK2-OsTCP19 module links nitrate and BR pathways; OsGSK2 promotes OsTCP19 degradation, while OsGSK2 stabilizes it via phosphorylation.
OsTCP19 directly regulates nitrate and root development genes, impacting N response and root plasticity.

Conclusions:

A direct molecular link between nitrate and BR signaling is established via the OsGSK2-OsTCP19 module in rice.
This crosstalk is essential for coordinating nitrogen utilization and root developmental plasticity in response to fluctuating nutrient environments.