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The ABC model and its applicability to basal angiosperms.

Douglas E Soltis1, André S Chanderbali, Sangtae Kim

  • 1Department of Botany, University of Florida, Gainesville, FL 32611, USA. dsoltis@botany.ufl.edu

Annals of Botany
|July 10, 2007
PubMed
Summary
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The earliest flowers had a rich set of floral genes, with broader expression patterns than currently understood. A new

Area of Science:

  • Plant developmental genetics
  • Evolutionary biology
  • Floral evolution

Background:

  • The origin and diversification of angiosperm flowers remain largely unknown.
  • The ABC model of floral development, based on eudicot models, is the current paradigm.
  • New insights into floral evolution arise from integrating phylogenetics, developmental studies, and genomics.

Purpose of the Study:

  • To investigate floral organ identity genes in basal angiosperms.
  • To understand the evolution of floral development beyond the classic ABC model.
  • To propose a new hypothesis for floral development in early angiosperms.

Main Methods:

  • Phylogenetic analysis of floral genes.
  • Comparative genomics of basal angiosperm lineages.

Related Experiment Videos

  • Developmental genetics studies.

    • Main Results:

    • Basal angiosperms possessed a comprehensive toolkit of floral genes.
    • Homologues of ABCE floral genes are present in basal angiosperms.
    • C-, E-, and B-function genes show broader expression in basal lineages compared to eudicots.

    Conclusions:

    • A single ABC or ABCE model does not fit all angiosperms; multiple models are required.
    • Modifications to the ABC model are necessary for basal eudicots and basal angiosperms.
    • The 'fading borders' hypothesis is proposed for the earliest angiosperms.