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Related Experiment Videos

Transgenic study of parallelism in plant morphological evolution.

Ho-Sung Yoon1, David A Baum

  • 1Department of Botany, University of Wisconsin, 430 Lincoln Drive, Madison, WI 53706, USA.

Proceedings of the National Academy of Sciences of the United States of America
|April 21, 2004
PubMed
Summary

Similar genetic mechanisms drive independent evolution of rosette flowering in mustard plants. While the LFY gene was involved in two lineages, regulatory changes upstream of LFY were key in the third case.

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Area of Science:

  • Evolutionary developmental biology
  • Plant genetics
  • Molecular evolution

Background:

  • Developmental constraint occurs when similar genetic mechanisms underlie independent evolutionary origins of the same trait.
  • Rosette flowering is a derived trait in the mustard family (Brassicaceae) that evolved independently multiple times from ancestral inflorescence flowering.
  • Understanding the genetic basis of these independent evolutionary events can reveal patterns of developmental constraint.

Purpose of the Study:

  • To investigate the genetic mechanisms underlying three independent origins of rosette flowering in the mustard family.
  • To determine the extent to which the same genes and regulatory elements were involved in each evolutionary transition.
  • To evaluate the role of the LEAFY (LFY) gene and its cis-regulatory sequences in the evolution of rosette flowering.

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Main Methods:

  • Comparative genetic analysis of three independent rosette-flowering lineages within the mustard family.
  • Transgenic experiments in Arabidopsis thaliana, a model plant, to test the function of LFY and its cis-regulatory sequences from rosette-flowering species.
  • Analysis of gene expression patterns driven by cis-regulatory sequences to infer regulatory changes.

Main Results:

  • Genetic transformation experiments indicated that changes at the LFY locus contributed to rosette flowering evolution in two of the three studied lineages.
  • In the third lineage, genetic changes upstream of the LFY gene were implicated in the evolution of rosette flowering.
  • Transgenic phenotypes and expression data supported the role of LFY and its regulatory regions in shaping the rosette-flowering trait.

Conclusions:

  • The evolution of rosette flowering in the mustard family provides evidence for developmental constraint, where similar developmental programs are recurrently modified.
  • While a single developmental regulatory program underlies multiple origins of rosette flowering, the specific genetic changes driving these transitions differ across lineages.
  • This study highlights the interplay between conserved developmental pathways and lineage-specific genetic alterations in shaping evolutionary innovation.