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5253137 
Journal Article 
Speciation by genome duplication: Repeated origins and genomic composition of the recently formed allopolyploid species Mimulus peregrinus 
Vallejo-Marín, M; Buggs, RJA; Cooley, AM; Puzey, JR 
2015 
Yes 
Evolution
ISSN: 0014-3820
EISSN: 1558-5646 
69 
6 
1487-1500 
Whole genome duplication (polyploidization) 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 1200 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 naturalized 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 allopolyploidization provide a powerful opportunity to explore the early stages of hybridization and genome duplication in naturally evolved lineages. 
CABSCLASS; 84.5.22, GENETICS AND MOLECULAR BIOLOGY; EUKARYOTIC GENETICS; Ecological and Population Genetics; 84.5.26, GENETICS AND MOLECULAR BIOLOGY; Higher Plant Genetics; 92.12.1, PLANT SCIENCE; GENETICS AND BREEDING; Genetics; 92.14.1.7, PLANT SCIENCE; DIVERSITY; Taxonomy, Systematics and Evolutionary Studies; Evolution; Plant Science; Mimulus guttatus; Mimulus luteus; Peregrinus