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Dissecting the pathways coordinating patterning and growth by plant boundary domains.

Aude Maugarny-Calès1,2, Millán Cortizo1, Bernard Adroher1

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Area of Science:

  • Plant biology
  • Developmental biology
  • Genetics

Background:

  • Boundary domains are crucial for morphogenesis in plants and animals.
  • The CUC genes define boundary domains in aerial plant structures.
  • CUC genes regulate leaf complexity across Angiosperms.

Purpose of the Study:

  • To investigate the role of CUC2 in boundary-controlled morphogenesis.
  • To understand how CUC2 coordinates patterning and growth during leaf margin development.
  • To elucidate the genetic and molecular network downstream of CUC2.

Main Methods:

  • Utilized conditional restoration of CUC2 function in Arabidopsis.
  • Employed morphometrics to analyze tooth formation.
  • Quantified gene expression and hormone signaling pathways.

Main Results:

  • Tooth morphogenesis comprises distinct patterning and growth phases.
  • CUC2 is essential for patterning but not for growth.
  • CUC2 activates functional relays, including KLUH, to promote growth.
  • KLUH modulates auxin response downstream of CUC2 and can rescue CUC2 deficiency.

Conclusions:

  • CUC2-defined boundaries coordinate patterning and growth during leaf margin morphogenesis.
  • A genetic network involving CUC2 and KLUH regulates plant development.
  • Understanding these mechanisms provides insights into leaf complexity and evolution.