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Natural selection on a leaf-shape polymorphism in the ivyleaf morning glory (Ipomoea hederacea).

Publication ,  Journal Article
Bright, KL; Rausher, MD
Published in: Evolution; international journal of organic evolution
August 2008

Leaf shape is one of the most variable plant traits. Previous work has provided much indirect evidence that leaf-shape variation is adaptive and that leaf shape influences thermoregulation, water balance, and resistance to natural enemies. Nevertheless, there is little direct evidence that leaf shape actually affects plant fitness. In this study, we first demonstrate that populations of the ivyleaf morning glory, Ipomoea hederacea, in North and South Carolina are frequently polymorphic at a locus that influences leaf shape. We then employ several field experiments to show that this polymorphism is subject to selection. In two of the experiments, at different sites, heterozygotes enjoyed a fitness advantage over both homozygotes. At a third site, in one year directional selection favored lobed leaves, whereas in a second year the pattern of fitnesses was consistent with similar directional selection or heterozygote superiority. Computer simulations of heterozygote advantage under the high selfing rates of I. hederacea indicate that balancing selection of the magnitude observed can by itself stabilize the polymorphism, although spatially and temporally variable selection may also contribute to its long-term maintenance.

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Published In

Evolution; international journal of organic evolution

DOI

EISSN

1558-5646

ISSN

0014-3820

Publication Date

August 2008

Volume

62

Issue

8

Start / End Page

1978 / 1990

Related Subject Headings

  • South Carolina
  • Selection, Genetic
  • Polymorphism, Genetic
  • Pollen
  • Plant Leaves
  • North Carolina
  • Models, Genetic
  • Ipomoea
  • Homozygote
  • Heterozygote
 

Citation

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ICMJE
MLA
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Bright, K. L., & Rausher, M. D. (2008). Natural selection on a leaf-shape polymorphism in the ivyleaf morning glory (Ipomoea hederacea). Evolution; International Journal of Organic Evolution, 62(8), 1978–1990. https://doi.org/10.1111/j.1558-5646.2008.00416.x
Bright, Kerry L., and Mark D. Rausher. “Natural selection on a leaf-shape polymorphism in the ivyleaf morning glory (Ipomoea hederacea).Evolution; International Journal of Organic Evolution 62, no. 8 (August 2008): 1978–90. https://doi.org/10.1111/j.1558-5646.2008.00416.x.
Bright KL, Rausher MD. Natural selection on a leaf-shape polymorphism in the ivyleaf morning glory (Ipomoea hederacea). Evolution; international journal of organic evolution. 2008 Aug;62(8):1978–90.
Bright, Kerry L., and Mark D. Rausher. “Natural selection on a leaf-shape polymorphism in the ivyleaf morning glory (Ipomoea hederacea).Evolution; International Journal of Organic Evolution, vol. 62, no. 8, Aug. 2008, pp. 1978–90. Epmc, doi:10.1111/j.1558-5646.2008.00416.x.
Bright KL, Rausher MD. Natural selection on a leaf-shape polymorphism in the ivyleaf morning glory (Ipomoea hederacea). Evolution; international journal of organic evolution. 2008 Aug;62(8):1978–1990.
Journal cover image

Published In

Evolution; international journal of organic evolution

DOI

EISSN

1558-5646

ISSN

0014-3820

Publication Date

August 2008

Volume

62

Issue

8

Start / End Page

1978 / 1990

Related Subject Headings

  • South Carolina
  • Selection, Genetic
  • Polymorphism, Genetic
  • Pollen
  • Plant Leaves
  • North Carolina
  • Models, Genetic
  • Ipomoea
  • Homozygote
  • Heterozygote