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Related Experiment Video

Updated: May 28, 2026

Breeding by Design for Functional Rice with Genome Editing Technologies

Breeding by Design for Functional Rice with Genome Editing Technologies

Published on: January 3, 2025

FK506-binding proteins OsFKBP57 and OsFKBP73 confer salt tolerance in rice by activating the SOS pathway while

Zhaoyang Dai¹, Gaoming Chen¹, Wenwei Zhang¹

¹State Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization, Nanjing Agricultural University, Jiangsu Zhongshan Biological Breeding Laboratory, Nanjing 210095, China.

Plant Communications

|May 27, 2026

Summary

Two FK506-binding proteins, OsFKBP57 and OsFKBP73, were identified to regulate rice grain protein content and salt tolerance. These proteins coordinate plant defense against soil salinization, maintaining rice quality.

Keywords:

Oryza sativa L.PPIase SOS pathway grain protein peptidyl-prolyl isomerase rice salt tolerance

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Area of Science:

Plant Biology
Molecular Biology
Agricultural Science

Background:

Soil salinization critically impacts rice (Oryza sativa) yield and grain quality.
Elevated grain protein content under salt stress reduces consumer acceptance, yet underlying mechanisms are unclear.

Purpose of the Study:

To elucidate the molecular mechanisms of salt stress-induced changes in rice grain quality.
To identify key regulators of both salt tolerance and grain protein content in rice.

Main Methods:

Genetic analysis of FK506-binding proteins (OsFKBP57 and OsFKBP73) in rice.
Protein-protein interaction assays (e.g., yeast two-hybrid, co-immunoprecipitation).
Biochemical assays to determine enzyme activity and ion accumulation (Na+).

Main Results:

OsFKBP57 and OsFKBP73 interact with OsSOS2/OsSOS3 to enhance salt tolerance by reducing Na+ accumulation.
These proteins inhibit OsBCAT1 activity, regulating amino acid levels in grains under salt stress.
Knockout mutants exhibit increased glutelin accumulation and degraded grain quality under saline conditions.

Conclusions:

OsFKBP57 and OsFKBP73 are crucial regulators coordinating rice salt tolerance and grain quality.
These findings offer potential targets for improving rice resilience and nutritional value in saline environments.