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OsPHR2-OsDIR55 Module Enhances Root Barrier Integrity and Rice Tolerance to Phosphate Deficiency.

Wen Duan1, Xuemei Li1, Baoping Xue1

  • 1Department of Plant Sciences, State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, China.

Plant, Cell & Environment
|June 17, 2026
PubMed
Summary
This summary is machine-generated.

Low soil phosphate (Pi) limits plant growth. This study shows OsDIR55 enhances rice root adaptation to Pi deficiency by regulating lignification and Pi homeostasis, improving crop productivity.

Keywords:
OsDIR55nutrient homoeostasisphosphate deficiencyplant adaptationroot apoplastic barriers

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Area of Science:

  • Plant Biology
  • Molecular Genetics
  • Agricultural Science

Background:

  • Low inorganic phosphate (Pi) bioavailability in soil is a major constraint on plant growth and crop yields.
  • Phosphate deficiency can induce localized lignification in plant roots, affecting root structure and function.

Purpose of the Study:

  • To investigate the role of the OsDIR55 gene in rice response to low inorganic phosphate (Pi) conditions.
  • To elucidate the regulatory mechanism of OsDIR55 expression and its function in maintaining Pi homeostasis and root adaptation.

Main Methods:

  • Gene expression analysis (overexpression and loss-of-function mutants).
  • Promoter analysis and transcription factor binding assays (OsPHR2 and P1BS cis-elements).
  • Assessment of root anatomy, Pi content, and physiological responses under varying Pi conditions.

Main Results:

  • Overexpression of OsDIR55 enhanced rice growth and biomass under low Pi, while dir55 mutants showed impaired performance.
  • OsPHR2 directly regulates OsDIR55 expression in response to Pi deprivation.
  • OsDIR55 reinforces root apoplastic barrier function, maintaining Pi homeostasis and preventing Pi toxicity under sufficient conditions.

Conclusions:

  • The OsPHR2-OsDIR55 module is crucial for mediating root anatomical adaptations to Pi scarcity in rice.
  • OsDIR55 plays a significant role in Pi stress signaling and lignification, impacting plant responses to environmental stresses.
  • Understanding this pathway can inform strategies to improve crop productivity in low-phosphate soils.