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Comparative transcriptome analyses define genes and gene modules differing between two Populus genotypes with

Xiao Han1,2, Yi An3,2, Yangyan Zhou2

  • 1State Key Laboratory of Subtropical Silviculture, College of Forestry and Biotechnology, Zhejiang A&F University, Lin'an, Hangzhou, 311300 China.

Biotechnology for Biofuels
|August 13, 2020
PubMed
Summary
This summary is machine-generated.

Understanding tree radial growth is key for biofuel production. This study identified a BELL transcription factor, PeuBELL15, that enhances wood biomass accumulation by regulating cell division and secondary cell wall formation.

Keywords:
CRISPR/Cas9Cell cycleCell divisionCo-expression networkPopulusSecondary vascular tissueStem radial growth

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Area of Science:

  • Plant Biology
  • Forestry Science
  • Biotechnology

Background:

  • Wood is a vital biomass resource for global biofuel production.
  • Tree stem radial growth is crucial for biomass yield but genetically complex.
  • Investigating the genetic regulation of tree growth and wood development is essential.

Purpose of the Study:

  • To investigate the regulatory mechanisms of tree radial growth and wood development.
  • To identify genes controlling complex growth traits in poplar (Populus).
  • To understand the role of transcription factors in wood biomass accumulation.

Main Methods:

  • Comparative physiological analysis of two Populus genotypes with differing growth rates.
  • Transcriptome-wide gene expression profiling across different growth stages.
  • Co-expression network analysis to identify gene modules related to growth traits.
  • Functional characterization of candidate genes using transgenic and mutant approaches.

Main Results:

  • Differential gene expression identified key pathways in cell cycle, division, and secondary vascular development.
  • A BEL1-like (BELL) transcription factor, PeuBELL15, was upregulated in faster-growing genotypes.
  • PeuBELL15 overexpression and mutants revealed its role in enhancing glucan and lignin accumulation.
  • PeuBELL15 promotes secondary vascular growth by regulating cellulose and lignin biosynthesis genes.

Conclusions:

  • Active vascular cambium cell division and expansion, along with secondary cell wall deposition, drive stem radial growth and biomass accumulation.
  • PeuBELL15 is a key genetic regulator identified for improving tree growth and wood biomass.
  • This research provides valuable genetic resources for breeding elite, fast-growing, high-biomass poplar genotypes.