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Genetic Variation at Nuclear Loci Fails to Distinguish Two Morphologically Distinct Species of Aquilegia

Aquilegia formosa and pubescens are two closely related species belonging to the columbine genus. Despite their morphological and ecological differences, previous studies have revealed a large degree of intercompatibility, as well as little sequence divergence between these two taxa [1], [2]. We com...

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Autores principales: Cooper, Elizabeth A., Whittall, Justen B., Hodges, Scott A., Nordborg, Magnus
Formato: Texto
Lenguaje:English
Publicado: Public Library of Science 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2808223/
https://www.ncbi.nlm.nih.gov/pubmed/20098727
http://dx.doi.org/10.1371/journal.pone.0008655
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author Cooper, Elizabeth A.
Whittall, Justen B.
Hodges, Scott A.
Nordborg, Magnus
author_facet Cooper, Elizabeth A.
Whittall, Justen B.
Hodges, Scott A.
Nordborg, Magnus
author_sort Cooper, Elizabeth A.
collection PubMed
description Aquilegia formosa and pubescens are two closely related species belonging to the columbine genus. Despite their morphological and ecological differences, previous studies have revealed a large degree of intercompatibility, as well as little sequence divergence between these two taxa [1], [2]. We compared the inter- and intraspecific patterns of variation for 9 nuclear loci, and found that the two species were practically indistinguishable at the level of DNA sequence polymorphism, indicating either very recent speciation or continued gene flow. As a comparison, we also analyzed variation at two loci across 30 other Aquilegia taxa; this revealed slightly more differentiation among taxa, which seemed best explained by geographic distance. By contrast, we found no evidence for isolation by distance on a more local geographic scale. We conclude that the extremely low levels of genetic differentiation between A. formosa and A.pubescens at neutral loci will facilitate future genome-wide scans for speciation genes.
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spelling pubmed-28082232010-01-21 Genetic Variation at Nuclear Loci Fails to Distinguish Two Morphologically Distinct Species of Aquilegia Cooper, Elizabeth A. Whittall, Justen B. Hodges, Scott A. Nordborg, Magnus PLoS One Research Article Aquilegia formosa and pubescens are two closely related species belonging to the columbine genus. Despite their morphological and ecological differences, previous studies have revealed a large degree of intercompatibility, as well as little sequence divergence between these two taxa [1], [2]. We compared the inter- and intraspecific patterns of variation for 9 nuclear loci, and found that the two species were practically indistinguishable at the level of DNA sequence polymorphism, indicating either very recent speciation or continued gene flow. As a comparison, we also analyzed variation at two loci across 30 other Aquilegia taxa; this revealed slightly more differentiation among taxa, which seemed best explained by geographic distance. By contrast, we found no evidence for isolation by distance on a more local geographic scale. We conclude that the extremely low levels of genetic differentiation between A. formosa and A.pubescens at neutral loci will facilitate future genome-wide scans for speciation genes. Public Library of Science 2010-01-19 /pmc/articles/PMC2808223/ /pubmed/20098727 http://dx.doi.org/10.1371/journal.pone.0008655 Text en Cooper et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Cooper, Elizabeth A.
Whittall, Justen B.
Hodges, Scott A.
Nordborg, Magnus
Genetic Variation at Nuclear Loci Fails to Distinguish Two Morphologically Distinct Species of Aquilegia
title Genetic Variation at Nuclear Loci Fails to Distinguish Two Morphologically Distinct Species of Aquilegia
title_full Genetic Variation at Nuclear Loci Fails to Distinguish Two Morphologically Distinct Species of Aquilegia
title_fullStr Genetic Variation at Nuclear Loci Fails to Distinguish Two Morphologically Distinct Species of Aquilegia
title_full_unstemmed Genetic Variation at Nuclear Loci Fails to Distinguish Two Morphologically Distinct Species of Aquilegia
title_short Genetic Variation at Nuclear Loci Fails to Distinguish Two Morphologically Distinct Species of Aquilegia
title_sort genetic variation at nuclear loci fails to distinguish two morphologically distinct species of aquilegia
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2808223/
https://www.ncbi.nlm.nih.gov/pubmed/20098727
http://dx.doi.org/10.1371/journal.pone.0008655
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