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Related Experiment Videos

Polymorphism for interspecific cross-compatibility in phlox.

D A Levin1

  • 1Department of Botany, University of Texas at Austin, Austin, Tex. 78712.

Proceedings of the National Academy of Sciences of the United States of America
|April 1, 1973
PubMed
Summary

Extensive genetic variation in cross-compatibility exists between Phlox pilosa and P. glaberrima populations. Despite opportunities for reproductive isolation, selection has not reinforced these cross-compatibility barriers.

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Area of Science:

  • Plant reproductive biology
  • Evolutionary genetics
  • Ecology

Background:

  • Phlox pilosa and Phlox glaberrima exhibit extensive polymorphism in cross-compatibility.
  • This genetic variation is present within Illinois populations, indicating potential for reproductive interactions.

Purpose of the Study:

  • To investigate the genetic basis of cross-compatibility polymorphism between Phlox pilosa and P. glaberrima.
  • To determine if natural selection has favored the reinforcement of reproductive barriers in areas of sympatry.

Main Methods:

  • Analysis of genetic polymorphism for cross-compatibility traits.
  • Examination of population genetics data in areas of species contact.

Main Results:

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  • The observed polymorphism in cross-compatibility is genetically determined.
  • No evidence suggests that selection has acted to reinforce existing cross-compatibility barriers between the two Phlox species.

    • Conclusions:

    • Genetic factors underlie the variation in cross-compatibility between Phlox pilosa and P. glaberrima.
    • Despite the potential for selection to enhance reproductive isolation, such reinforcement has not been observed in the studied Illinois populations.