期刊
EVOLUTION
卷 69, 期 6, 页码 1487-1500出版社
OXFORD UNIV PRESS
DOI: 10.1111/evo.12678
关键词
Hybridization; invasive species; plant speciation; polyploidy; whole genome duplication
资金
- Natural Environment Research Council (NERC) [NE/J012645/1]
- NERC Biomolecular Analysis Facility grant [NBAF-710]
- BBSRC [BBS/E/D/20310000] Funding Source: UKRI
- MRC [MR/K001744/1, G0900740] Funding Source: UKRI
- NERC [NE/G01504X/1, NE/J012645/1, NBAF010003] Funding Source: UKRI
- Medical Research Council [G0900740, MR/K001744/1] Funding Source: researchfish
- Natural Environment Research Council [NE/G01504X/1, NE/J012645/1, NBAF010003] Funding Source: researchfish
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.
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