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Related Experiment Video

Updated: Jan 15, 2026

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GW8-OsMKKK55 module regulates stigma breadth in rice.

Hongming Guo1, Changling Mou1, Jianqun Lv1

  • 1Crop Germplasm Innovation and Genetic Improvement Key Laboratory of Sichuan Province, Crop Research Institute, Sichuan Academy of Agricultural Sciences (Sichuan Provincial Germplasm Resources Center), Chengdu, 610066, China; Key Laboratory of Tianfu Seed Industry Innovation (Co-construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, Chengdu, 610066, China.

Plant Physiology and Biochemistry : PPB
|October 16, 2025
PubMed
Summary
This summary is machine-generated.

Researchers identified GW8 as a key gene regulating stigma breadth in rice, crucial for pollination and seed setting in hybrid rice breeding. The GW8-OsMKKK55 module is vital for controlling stigma width.

Keywords:
Grain-width geneHybrid riceRegulatory networkStigmaqSTB-8

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Area of Science:

  • Plant genetics
  • Agricultural science
  • Molecular biology

Background:

  • Stigma breadth in rice is a critical trait for pollination efficiency and seed-setting rate.
  • This trait is particularly important for hybrid rice breeding.
  • Understanding the genetic regulation of stigma breadth can improve rice cultivation.

Purpose of the Study:

  • To identify and validate quantitative trait loci (QTLs) regulating stigma breadth in rice.
  • To confirm the candidate gene underlying stigma breadth.
  • To elucidate the molecular mechanism by which this gene regulates stigma breadth.

Main Methods:

  • Quantitative trait locus (QTL) analysis to identify qSTB-8.
  • Gene knockout experiments for GW8 and OsMKKK55.
  • Analysis of gene interactions and transcriptional activity.
  • Phenotypic analysis of stigma breadth in wild-type and mutant rice lines.

Main Results:

  • A QTL, qSTB-8, was identified and validated as regulating stigma breadth in rice.
  • The grain-width gene GW8 was confirmed as the candidate gene for stigma breadth.
  • GW8 knockout mutants showed significantly reduced stigma breadth.
  • GW8 was found to directly interact with OsMKKK55 and modulate its transcription.
  • OsMKKK55 knockout mutants also exhibited reduced stigma breadth.

Conclusions:

  • GW8 acts as a positive regulator of stigma breadth in rice.
  • The GW8-OsMKKK55 module plays a crucial role in regulating stigma breadth.
  • This finding has significant implications for hybrid rice breeding and crop improvement.