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Recombination provides evidence for ancient hybridisation in the Silene aegyptiaca (Caryophyllaceae) complex

Journal article
Authors Bernard E. Pfeil
Zeynep Toprak
Bengt Oxelman
Published in Organisms Diversity & Evolution
Volume 17
Issue 4
Pages 717-726
ISSN 1439-6092
Publication year 2017
Published at Department of Biological and Environmental Sciences
Pages 717-726
Language en
Links doi.org/10.1007/s13127-017-0331-9
https://gup.ub.gu.se/file/207142
Keywords Recombination Hybridisation Phylogenetics Paralogy Silene aegyptiaca Cryptic species
Subject categories Botany, Biological Systematics, Evolutionary Biology

Abstract

Recombination events among distinct alleles complicate phylogenetic estimation. Various in vivo and in vitro processes can bring distinct alleles into the same genome to then undergo recombination, which may subsequently mislead phylogenetic inference if not assessed properly. Among the processes bringing divergent alleles together, hybridisation is perhaps the simplest and most likely, but alternatives need to be considered before hybridisation can be accepted as the underlying cause. Such alternatives include the presence of paralogues or deeply coalescing alleles, as well as amplification artefacts. Here, we document a recombination event that apparently took place between two divergent lineages of the Silene aegyptiaca complex in the flowering plant family Caryophyllaceae. We evaluate several possible mechanisms that might be responsible for the observed pattern. An ancient introgressive hybridisation event was the simplest explanation for the observations, compatible with geographic proximity of the affected lineages, whereas paralogy and deep coalescence are difficult to reconcile with the evidence obtained from a species tree of the group based on six different, non-recombinant genes and gene trees inferred using two partitions of the recombinant locus.

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