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Speciation by genome duplication: Repeated origins and genomic composition of the recently formed allopolyploid species Mimulus peregrinus

Citation
Vallejo-Marin M, Buggs RJA, Cooley AM & Puzey JR (2015) Speciation by genome duplication: Repeated origins and genomic composition of the recently formed allopolyploid species Mimulus peregrinus, Evolution, 69 (6), pp. 1487-1500.

Abstract
Whole genome duplication (polyploidisation) is a mechanism of "instantaneous" species formation that has played a major role in the evolutionary history of plants. Much of what we know about the early evolution of polyploids is based upon studies of a handful of recently formed species. A new polyploid hybrid (allopolyploid) species Mimulus peregrinus, formed within the last 140 years, was recently discovered on the Scottish mainland and corroborated by chromosome counts. Here, using targeted, high-depth sequencing of 1,200 genic regions, we confirm the parental origins of this new species from M. x robertsii, a sterile triploid hybrid between the two introduced species M. guttatus and M. luteus that are naturalised and widespread in the United Kingdom. We also report a new population of M. peregrinus on the Orkney Islands and demonstrate that populations on the Scottish mainland and Orkney Islands arose independently via genome duplication from local populations of M. x robertsii. Our data raise the possibility that some alleles are already being lost in the evolving M. peregrinus genomes. The recent origins of a new species of the ecological model genus Mimulus via allopolyploidisation provide a powerful opportunity to explore the early stages of hybridisation and genome duplication in naturally evolved lineages.

Keywords
Hybridisation; invasive species; plant speciation; polyploidy; whole genome duplication.

StatusPublished
AuthorsVallejo-Marin Mario, Buggs Richard J A, Cooley Arielle M, Puzey Joshua R
Publication date06/2015
Publication date online01/05/2015
Date accepted by journal21/04/2015
PublisherWiley-Blackwell
ISSN 0014-3820
LanguageEnglish

Journal
Evolution: Volume 69, Issue 6

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