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VPB1 Encoding BELL-like Homeodomain Protein Is Involved in Rice Panicle Architecture.

Mu Li1, Debao Fu1, Tingting Xu1

  • 1National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China.

International Journal of Molecular Sciences
|August 7, 2021
PubMed
Summary
This summary is machine-generated.

The rice VPB1 gene regulates inflorescence architecture by controlling branch arrangement. This study identifies VPB1 as a BELL-like homeodomain protein crucial for maintaining meristem identity and hormone pathways, impacting rice yield.

Keywords:
BLH homedomain proteinbranching patternhormone pathwaysinflorescence architecturetranscriptome analysisverticillate primary branch

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Area of Science:

  • Plant genetics
  • Developmental biology
  • Agricultural science

Background:

  • Inflorescence architecture in rice (Oryza sativa) is determined by spikelets and branch arrangement, significantly impacting crop yield.
  • Primary branches develop from the inflorescence meristem in a spiral pattern, influencing overall panicle structure.

Purpose of the Study:

  • To characterize the verticillate primary branch 1 (vpb1) mutant in rice.
  • To elucidate the function of the VPB1 gene in regulating inflorescence architecture and its molecular mechanisms.

Main Methods:

  • Mutant characterization and gene isolation.
  • Gene expression analysis (transcriptome analysis).
  • Bioinformatic analysis (promoter analysis) and molecular assays (EMSA, dual-luciferase reporter assay).

Main Results:

  • The vpb1 mutant exhibits clustered primary branches, indicating a defect in branch arrangement.
  • VPB1 encodes a BELL-like homeodomain (BLH) protein preferentially expressed in meristems.
  • VPB1 influences inflorescence meristem identity and hormone signaling pathways, and directly binds to the OsBOP1 promoter.

Conclusions:

  • VPB1 is a key regulator of rice inflorescence architecture, controlling meristem maintenance and hormone pathways.
  • VPB1 interacts with OsBOP genes, highlighting its role in boundary organ initiation.
  • Understanding VPB1's function provides insights into improving rice yield through architectural modification.