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Related Experiment Videos

Legume comparative genomics: progress in phylogenetics and phylogenomics.

Quentin Cronk1, Isidro Ojeda, R Toby Pennington

  • 1Botanical Garden and Centre for Plant Research, University of British Columbia, 6804 SW Marine Drive, Vancouver V6T 1Z4, Canada. quentin.cronk@ubc.ca

Current Opinion in Plant Biology
|February 17, 2006
PubMed
Summary

Genomic studies reveal legume family (Leguminosae) evolution, with Papilionoideae subfamily diversifying rapidly 50-60 million years ago. Key clades and a gene duplication event were identified, impacting major legume groups.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Phylogenetics

Background:

  • The Leguminosae family, particularly the Papilionoideae subfamily, is central to expanding genomic research.
  • Recent phylogenetic studies have identified well-supported clades within the Papilionoideae, including the genistoids, dalbergioids, millettioids, and hologalegina legumes.
  • The evolution of canavanine accumulation appears to be a single event within a specific legume clade.

Purpose of the Study:

  • To outline the current understanding of Papilionoideae subfamily phylogeny and evolutionary history.
  • To investigate the timing of diversification and key evolutionary events within legumes.
  • To explore the potential for gene duplication events across different legume clades.

Main Methods:

  • Phylogenetic analysis of genomic data.

Related Experiment Videos

  • Dating of evolutionary divergences using molecular techniques.
  • Comparative genomics to identify gene duplication events.

    • Main Results:

    • The Papilionoideae subfamily is monophyletic, with several informal clades identified (e.g., Cladrastis, genistoids, dalbergioids, millettioids, hologalegina).
    • Phylogenetic dating supports an 'early explosion' of legume diversity around 50-60 million years ago.
    • The divergence between Glycine and Medicago occurred approximately 54 million years ago, with evidence of a palaeoduplication event affecting both.

    Conclusions:

    • Legume family evolution is characterized by rapid diversification and specific clade formations.
    • The production of canavanine likely evolved once in legumes.
    • Further genomic data for Arachis will help determine if the identified palaeoduplication event is widespread in dalbergioids.