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A WOX/Auxin Biosynthesis Module Controls Growth to Shape Leaf Form.

Zhongjuan Zhang1, Adam Runions1, Remco A Mentink1

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Summary

Plant homeobox (WOX) genes WOX5, WOX1, and WOX3 coordinate leaf shape by regulating auxin biosynthesis. This ensures proper growth along both proximodistal and mediolateral axes for correct organ formation.

Keywords:
Arabidopsis thalianaWOXYUCCAauxingrowthleaf shapelive imaging

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Area of Science:

  • Plant biology
  • Developmental biology
  • Genetics

Background:

  • Coordinating growth along multiple axes is crucial for plant organ development.
  • The cell-level mechanisms controlling leaf shape and growth coordination are not fully understood.

Purpose of the Study:

  • To investigate the role of WUSCHEL-RELATED HOMEOBOX (WOX) genes in controlling Arabidopsis thaliana leaf shape.
  • To elucidate the molecular mechanisms by which WOX genes regulate leaf growth and form.

Main Methods:

  • Genetic analysis of WOX gene mutants in A. thaliana.
  • Hormone measurements to assess auxin levels.
  • Time-lapse growth analysis to observe leaf development.
  • Gene expression analysis of YUCCA (YUC) auxin biosynthetic genes.

Main Results:

  • WOX5 acts redundantly with WOX1 and WOX3 (PRESSED FLOWER [PRS]) to control leaf shape.
  • These WOX genes regulate leaf margin patterning via regional control of YUCCA (YUC) auxin biosynthesis.
  • WOX-mediated auxin biosynthesis establishes a proximodistal growth gradient, promoting lateral growth and ellipsoid leaf shape.
  • WOX proteins regulate differentiation gradients, inhibiting proximal and promoting distal differentiation for sustained blade growth.

Conclusions:

  • The WOX/auxin regulatory module is essential for coordinating proximodistal and mediolateral growth axes in plant leaves.
  • Precise spatial regulation of auxin biosynthesis by WOX genes is critical for achieving the final leaf form.
  • This study reveals a key mechanism underlying plant organ morphogenesis.