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Plant development: Building bilateral symmetry.

Lanxi Hu1, Adrienne H K Roeder1

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Summary
This summary is machine-generated.

Bilateral symmetry in flowers evolved over 130 times. A new study reveals how CYCLOIDEA (CYC) gene expression in monkeyflowers interacts with BLADE-ON PETIOLE (BOP) and auxin to control floral development.

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Area of Science:

  • Plant developmental biology
  • Evolutionary developmental biology
  • Floral genetics

Background:

  • Bilateral symmetry has evolved independently at least 130 times in angiosperms.
  • The CYCLOIDEA (CYC) gene family is a key regulator of floral symmetry, typically showing asymmetric dorsal-ventral expression.
  • Understanding the genetic mechanisms underlying floral symmetry is crucial for evolutionary studies.

Purpose of the Study:

  • To investigate the spatiotemporal expression pattern of CYCLOIDEA (CYC) in the monkeyflower (Mimulus) floral meristem.
  • To explore the interplay between CYC, BLADE-ON PETIOLE (BOP) genes, and auxin signaling in regulating floral asymmetry.
  • To elucidate the molecular basis of floral symmetry evolution in a model species.

Main Methods:

  • Detailed analysis of CYC gene expression using in situ hybridization.
  • Investigating the interaction between CYC and BOP genes through genetic crosses and expression analysis.
  • Assessing the role of auxin gradients and signaling pathways in floral development.

Main Results:

  • The study precisely mapped the CYC spatiotemporal expression within the monkeyflower floral meristem.
  • Evidence was found for a functional interplay between CYC, BOP genes, and auxin activity in establishing floral asymmetry.
  • Specific patterns of CYC expression correlate with the development of dorsal and ventral floral organs.

Conclusions:

  • The findings provide a detailed understanding of CYC gene function in establishing floral symmetry in monkeyflowers.
  • This research highlights the conserved and potentially novel roles of CYC, BOP, and auxin in floral development across different species.
  • The study contributes to our knowledge of the genetic toolkit underlying the evolution of floral bilateral symmetry.