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OsHOX24 Modulates Grain Size and Salt Tolerance Via OsPP2C09 in Rice.

Bin Gao1, Shibo Li1, Zhixue Huo1

  • 1National Center for Evaluation of Agricultural Wild Plants (Rice), Department of Plant Genetics and Breeding, China Agricultural University, Beijing, China.

Rice (New York, N.Y.)
|June 11, 2026
PubMed
Summary
This summary is machine-generated.

A rice gene, OsHOX24, influences both grain size and salt tolerance. Specific variants of OsHOX24 offer potential for breeding rice with improved yield and resilience.

Keywords:
Grain sizeRiceSalt tolerance

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Area of Science:

  • Plant Biology
  • Genetics
  • Agricultural Science

Background:

  • Grain size and stress resistance are critical for stable rice yield.
  • The genetic basis coordinating these traits is not fully understood.

Purpose of the Study:

  • To investigate the role of OsHOX24 in regulating grain size and salt tolerance in rice.
  • To elucidate the molecular mechanisms underlying OsHOX24's function.

Main Methods:

  • Gene expression analysis
  • Physiological assays for salt tolerance
  • Promoter binding assays
  • Haplotype analysis of OsHOX24

Main Results:

  • OsHOX24 enhances rice grain size by promoting cell division and expansion.
  • OsHOX24 negatively impacts salt tolerance.
  • OsHOX24 is involved in abscisic acid (ABA) signaling and activates OsPP2C09.
  • A prevalent indica haplotype (Hap1) of OsHOX24 is linked to superior grain size and salt tolerance.

Conclusions:

  • OsHOX24 plays a dual role in rice, promoting grain size but reducing salt tolerance.
  • OsHOX24 and OsPP2C09 jointly regulate these traits via ABA signaling.
  • OsHOX24 haplotypes show differentiation between indica and japonica rice, with Hap1 being a target for breeding improved rice varieties.