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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
Summary
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.
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.
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