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WL1 regulates grain width development in rice.

Yi Zhang1, Mi Wei1, Jing You1

  • 1Chongqing Key Laboratory of Crop Molecular Improvement, Rice Research Institute, Academy of Agricultural Sciences, College of Agronomy and Biotechnology, Southwest University, Chongqing, 400715, China.

The Plant Journal : for Cell and Molecular Biology
|August 12, 2025
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Summary
This summary is machine-generated.

The WL1 gene regulates grain width by controlling cell expansion in rice. This discovery reveals a key pathway for improving grain size and crop yield.

Keywords:
WL1/DSTcytokiningrain widthrice

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Area of Science:

  • Plant Biology
  • Genetics
  • Molecular Biology

Background:

  • Grain size is crucial for crop yield, but its genetic regulation remains largely uncharacterized.
  • The wl1 mutant, previously linked to leaf width, shows altered grain morphology.

Purpose of the Study:

  • To elucidate the genetic pathway controlled by WL1 in regulating rice grain width.
  • To identify molecular mechanisms underlying WL1-mediated grain size control.

Main Methods:

  • Genetic analysis of the wl1 mutant in rice.
  • Investigating the interaction of WL1 with NAL2 and cytokinin signaling components.
  • Assessing histone acetylation levels and gene expression.

Main Results:

  • The APC/CTAD1-WL1 module regulates grain width through cell expansion and proliferation in the glume.
  • WL1 directly represses NAL2 expression by reducing histone acetylation.
  • WL1 interacts with RRB2 in the cytokinin pathway, inhibiting OsRR6 activity.

Conclusions:

  • A novel WL1-mediated pathway controlling rice grain size has been established.
  • Understanding this pathway is vital for enhancing grain development and increasing crop yield.