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Research Article

Molecular population genetics of the Arabidopsis CAULIFLOWER regulatory gene: Nonneutral evolution and naturally occurring variation in floral homeotic function

Michael D. Purugganan and Jane I. Suddith
PNAS July 7, 1998 95 (14) 8130-8134; https://doi.org/10.1073/pnas.95.14.8130
Michael D. Purugganan
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Jane I. Suddith
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  1. Communicated by Major M. Goodman, North Carolina State University, Raleigh, NC (received for review November 7, 1997)

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Abstract

The evolution of interspecies differences in morphology requires sufficient within-species variation in developmental regulatory systems on which evolutionary forces can act. Molecular analyses of naturally occurring alleles of the Arabidopsis thaliana CAULIFLOWER locus reveal considerable intraspecific diversity at this floral homeotic gene, and the McDonald–Kreitman test suggests that this gene is evolving in a nonneutral fashion, with an excess of intraspecific replacement polymorphisms. The naturally occurring molecular variation within this floral regulatory gene is associated with functionally different alleles, which can be distinguished phenotypically by their differential ability to direct floral meristem development.

  • development/ecotype/flower/inflorescence/MADS-box

Footnotes

    • ↵* To whom reprint requests should be addressed. e-mail: michael_purugganan{at}ncsu.edu.

    • Data deposition: The sequences reported in this paper have been deposited in the GenBank database (accession nos. AF061401–AF061416).

  • ABBREVIATIONS

    CAL,
    CAULIFLOWER;
    AP1,
    APETALA1;
    Ka,
    nonsynonymous substitutions;
    Ks,
    synonymous substitutions, Ws, Wassileskija
    • Received November 7, 1997.
    • Accepted May 12, 1998.
    • Copyright © 1998, The National Academy of Sciences
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    Molecular population genetics of the Arabidopsis CAULIFLOWER regulatory gene: Nonneutral evolution and naturally occurring variation in floral homeotic function
    Michael D. Purugganan, Jane I. Suddith
    Proceedings of the National Academy of Sciences Jul 1998, 95 (14) 8130-8134; DOI: 10.1073/pnas.95.14.8130

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    Molecular population genetics of the Arabidopsis CAULIFLOWER regulatory gene: Nonneutral evolution and naturally occurring variation in floral homeotic function
    Michael D. Purugganan, Jane I. Suddith
    Proceedings of the National Academy of Sciences Jul 1998, 95 (14) 8130-8134; DOI: 10.1073/pnas.95.14.8130
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