Origin of floral asymmetry in Antirrhinum

Nature. 1996 Oct 31;383(6603):794-9. doi: 10.1038/383794a0.


Dorsoventral asymmetry in flowers is thought to have evolved many times from a radially symmetrical ancestral condition. The first gene controlling floral asymmetry, cycloidea in Antirrhinum, has been isolated. The cycloidea gene is expressed at a very early stage in dorsal regions of floral meristems, where it affects growth rate and primordium initiation. Expression continues through to later stages in dorsal primordia to affect the asymmetry, size and cell types of petals and stamens.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alleles
  • Amino Acid Sequence
  • Base Sequence
  • DNA, Plant
  • DNA-Binding Proteins
  • Molecular Sequence Data
  • Mutation
  • Phenotype
  • Plant Proteins / genetics*
  • Plants / anatomy & histology
  • Plants / genetics*
  • Transcription Factors


  • DNA, Plant
  • DNA-Binding Proteins
  • Plant Proteins
  • Transcription Factors
  • cycloidea protein, Antirrhinum

Associated data

  • GENBANK/R29994
  • GENBANK/R30409
  • GENBANK/T45419