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Updated: Apr 15, 2026

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Wood Formation in Trees Is Increased by Manipulating PXY-Regulated Cell Division.

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Scientists identified a key pathway regulating wood formation in trees. Manipulating the PXY-CLE pathway significantly increased tree growth and wood production, offering potential for enhanced forest productivity.

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Area of Science:

  • Plant Biology
  • Forestry
  • Molecular Genetics

Background:

  • Woody tissue in trees, like xylem, forms from cambial meristem stem cell divisions.
  • Cambial cell division rates, influenced by genetics and environment, control xylem formation.
  • In Arabidopsis, the CLE41-PXY signaling pathway regulates cambial cell division, but this pathway in trees remains uncharacterized.

Purpose of the Study:

  • To identify and characterize the pathway regulating secondary growth in trees.
  • To investigate the roles of aspen orthologs PttPXY and PttCLE41 in cambial cell division and wood formation.

Main Methods:

  • Identified aspen PttPXY and PttCLE41 as functional orthologs of Arabidopsis PXY and CLE41.
  • Utilized ectopic and tissue-specific overexpression of PttPXY and PttCLE41 in hybrid aspen.
  • Assessed effects on cambial cell division, vascular tissue organization, and overall tree growth.

Main Results:

  • Ectopic overexpression of PttPXY and PttCLE41 led to vascular abnormalities and impaired growth.
  • Tissue-specific overexpression resulted in a 2-fold increase in wood formation rate.
  • Overexpressing trees were taller with larger leaves compared to controls.

Conclusions:

  • The PXY-CLE pathway is conserved and regulates secondary growth in trees.
  • Manipulating the PXY-CLE pathway can significantly enhance tree growth and wood productivity.
  • This research offers a potential strategy for improving forest yields.