Skip to content

Research at St Andrews

Genomic architecture of phenotypic divergence between two hybridizing plant species along an elevational gradient

Research output: Contribution to journalArticle

DOI

Open Access permissions

Open

Author(s)

Adrian C. Brennan, Simon J. Hiscock, Richard John Abbott

School/Research organisations

Abstract

Knowledge of the genetic basis of phenotypic divergence between species and how such divergence is caused and maintained is crucial to an understanding of speciation and the generation of biodiversity. The hybrid zone between Senecio aethnensis and S. chrysanthemifolius on Mount Etna, Sicily, provides a well-studied example of species divergence in response to conditions at different elevations, despite hybridization and gene flow. Here, we investigate the genetic architecture of divergence between these two species using a combination of quantitative trait locus (QTL) mapping and genetic differentiation measures based on genetic marker analysis. A QTL architecture characterized by physical QTL clustering, epistatic interactions between QTLs, and pleiotropy was identified, and is consistent with the presence of divergent QTL complexes resistant to gene flow. A role for divergent selection between species was indicated by significant negative associations between levels of interspecific genetic differentiation at mapped marker gene loci and map distance from QTLs and hybrid incompatibility loci. Within-species selection contributing to interspecific differentiation was evidenced by negative associations between interspecific genetic differentiation and genetic diversity within species. These results show that the two Senecio species, while subject to gene flow, maintain divergent genomic regions consistent with local selection within species and selection against hybrids between species which, in turn, contribute to the maintenance of their distinct phenotypic differences.
Close

Details

Original languageEnglish
Number of pages13
JournalAoB Plants
Volume8
Issue numberplw022
DOIs
Publication statusPublished - 15 Apr 2016

    Research areas

  • Genetic differentiation, Hybridization, Phenotypic divergence, QTL architecture, QTL interactions, Selection, Speciation

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Genetic diversity hotspots and refugia identified by mapping multi-plant species haplotype diversity in China

    Deng, T., Abbott, R. J., Li, W., Sun, H. & Volis, S., 27 Aug 2019, In : Israel Journal of Plant Sciences. 66, 3-4, p. 136-151 16 p.

    Research output: Contribution to journalArticle

  2. Ancient introgression drives adaptation to cooler and drier mountain habitats in a cypress species complex

    Ma, Y., Wang, J., Hu, Q., Li, J., Sun, Y., Zhang, L., Abbott, R. J., Liu, J. & Mao, K., 18 Jun 2019, In : Communications Biology. 2, 12 p., 213.

    Research output: Contribution to journalArticle

  3. Late Pleistocene speciation of three closely related tree peonies endemic to the Qinling–Daba Mountains, a major glacial refugium in Central China

    Xu, X-X., Cheng, F-Y., Peng, L-P., Sun, Y-Q., Hu, X-G., Li, S-Y., Xian, H-L., Jia, K-H., Abbott, R. J. & Mao, J-F., 17 Jun 2019, In : Ecology and Evolution. Early View, 21 p.

    Research output: Contribution to journalArticle

  4. Divergence and reproductive isolation between two closely related allopatric Iris species

    Volis, S., Zhang, Y-H., Deng, T., Dorman, M., Blecher, M. & Abbott, R. J., Jun 2019, In : Biological Journal of the Linnean Society. 127, 2, p. 377-389 13 p.

    Research output: Contribution to journalArticle

  5. A mixing-isolation-mixing model of speciation can potentially explain hotspots of species diversity

    Abbott, R. J., Mar 2019, In : National Science Review. 6, 2, p. 290-291 2 p.

    Research output: Contribution to journalComment/debate

Related by journal

  1. Completing the hybridization triangle: the inheritance of genetic incompatibilities during homoploid hybrid speciation in ragworts (Senecio).

    Brennan, A. C., Hiscock, S. J. & Abbott, R. J., Feb 2019, In : AoB Plants. 11, 1, 15 p., ply078.

    Research output: Contribution to journalArticle

ID: 242240004

Top