Evolutionary paths underlying flower color variation in Antirrhinum

Science. 2006 Aug 18;313(5789):963-6. doi: 10.1126/science.1129161.

Abstract

To understand evolutionary paths connecting diverse biological forms, we defined a three-dimensional genotypic space separating two flower color morphs of Antirrhinum. A hybrid zone between morphs showed a steep cline specifically at genes controlling flower color differences, indicating that these loci are under selection. Antirrhinum species with diverse floral phenotypes formed a U-shaped cloud within the genotypic space. We propose that this cloud defines an evolutionary path that allows flower color to evolve while circumventing less-adaptive regions. Hybridization between morphs located in different arms of the U-shaped path yields low-fitness genotypes, accounting for the observed steep clines at hybrid zones.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptation, Biological
  • Alleles
  • Antirrhinum / classification
  • Antirrhinum / genetics*
  • Base Sequence
  • Biological Evolution*
  • Crosses, Genetic
  • Flowers / genetics*
  • Gene Flow
  • Gene Frequency
  • Genes, Plant
  • Genetic Speciation*
  • Genotype
  • Haplotypes
  • Hybridization, Genetic
  • Models, Genetic
  • Molecular Sequence Data
  • Phenotype
  • Phylogeny
  • Pigmentation / genetics*
  • Pigments, Biological / genetics
  • Principal Component Analysis
  • Selection, Genetic

Substances

  • Pigments, Biological

Associated data

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