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Interspecific Plastome Recombination Reflects Ancient Reticulate Evolution in Picea (Pinaceae)
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Department of Biology, Dalhousie University, Halifax, NS, Canada.
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
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2017 (English)In: Molecular biology and evolution, ISSN 0737-4038, E-ISSN 1537-1719, Vol. 34, no 7, 1689-1701 p.Article in journal (Refereed) Published
Abstract [en]

Plastid sequences are a cornerstone in plant systematic studies and key aspects of their evolution, such as uniparental inheritance and absent recombination, are often treated as axioms. While exceptions to these assumptions can profoundly influence evolutionary inference, detecting them can require extensive sampling, abundant sequence data, and detailed testing. Using advancements in high-throughput sequencing, we analyzed the whole plastomes of 65 accessions of Picea, a genus of similar to 35 coniferous forest tree species, to test for deviations from canonical plastome evolution. Using complementary hypothesis and data-driven tests, we found evidence for chimeric plastomes generated by interspecific hybridization and recombination in the clade comprising Norway spruce (P. abies) and 10 other species. Support for interspecific recombination remained after controlling for sequence saturation, positive selection, and potential alignment artifacts. These results reconcile previous conflicting plastid-based phylogenies and strengthen the mounting evidence of reticulate evolution in Picea. Given the relatively high frequency of hybridization and biparental plastid inheritance in plants, we suggest interspecific plastome recombination may be more widespread than currently appreciated and could underlie reported cases of discordant plastid phylogenies.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2017. Vol. 34, no 7, 1689-1701 p.
Keyword [en]
hybridization, chloroplast genomes, phylogenetic incongruence, recombination, reticulate evolution
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-137034DOI: 10.1093/molbev/msx111ISI: 000402754400012PubMedID: 28383641OAI: oai:DiVA.org:umu-137034DiVA: diva2:1117466
Available from: 2017-06-29 Created: 2017-06-29 Last updated: 2017-06-29Bibliographically approved

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Sullivan, Alexis R.Schiffthaler, BastianThompson, Stacey LeeStreet, Nathaniel R.Wang, Xiao-Ru
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