Evolution of allometry in antirrhinum

Xianzhong Feng, Yvette Wilson, Jennifer Bowers, Richard Kennaway, Andrew Bangham, Andrew Hannah, Enrico Coen, Andrew Hudson

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Correlated variation in shape and size (allometry) is a major component of natural diversity. We examined the evolutionary and genetic basis for allometry using leaves and flower petals of snapdragon species (Antirrhinum). A computational method was developed to capture shape and size variation in both types of organ within the Antirrhinum species group. The results show that the major component of variation between species involves positively correlated changes in leaf and petal size. The correlation was maintained in an F2 population derived from crossing two species with organs of different sizes, suggesting that developmental constraints were involved. Identification of the underlying genes as quantitative trait loci revealed that the larger species carried alleles that increased organ size at all loci. Although this was initially taken as evidence that directional selection has driven diversity in both leaf and petal size, simulations revealed that evolution without consistent directional selection, an undirected walk, could also account for the parental distribution of organ size alleles.
Original languageEnglish
Pages (from-to)2999-3007
Number of pages9
JournalThe Plant Cell
Issue number10
Publication statusPublished - Oct 2009


  • Flowers
  • Plant Leaves
  • Biological Evolution
  • Antirrhinum

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