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Balancing selection on a floral polymorphism.

B Subramaniam¹, M D Rausher

¹Department of Zoology, Evolution, Ecology, Duke University, Durham, North Carolina 27708-0325, USA. banu@u.arizona.edu

Evolution; International Journal of Organic Evolution

|August 11, 2000

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Balancing selection actively maintains flower color alleles in common morning glories (Ipomoea purpurea) at the W locus. This study provides direct evidence for selection maintaining genetic diversity in this plant population.

Area of Science:

Population Genetics
Plant Evolutionary Biology
Molecular Ecology

Background:

The common morning glory (Ipomoea purpurea) displays flower color variation attributed to the W locus.
Allelic variations at the W locus result in distinct phenotypes: dark (WW), light (Ww), and white with pigmented rays (ww).

Purpose of the Study:

To investigate the role of balancing selection in maintaining flower color polymorphism at the W locus.
To provide direct evidence for the selective forces acting on W locus alleles in natural populations.

Main Methods:

Conducted a perturbation (convergence) experiment utilizing five distinct plots.
Monitored changes in gene frequencies at the W locus over the experimental period.

Main Results:

Related Experiment Videos

Observed patterns of gene frequency changes consistent with balancing selection.
Demonstrated that both W locus alleles are actively maintained by selection.

Conclusions:

The results strongly indicate that balancing selection operates at the W locus in Ipomoea purpurea.
This provides direct experimental evidence for the maintenance of genetic diversity through selection in this species.