Reproductive isolation and introgression between sympatric Mimulus species
Abstract
Incompletely isolated species provide an opportunity to investigate the genetic mechanisms and evolutionary forces that maintain distinct species in the face of ongoing gene flow. Here, we use field surveys and reduced representation sequencing to characterize the patterns of reproductive isolation, admixture and genomic divergence between populations of the outcrossing wildflower Mimulus guttatus and selfing M. nasutus. Focusing on a single site where these two species have come into secondary contact, we find that phenological isolation is strong, although incomplete, and is likely driven by divergence in response to photoperiod. In contrast to previous field studies, which have suggested that F1 -hybrid formation might be rare, we discover patterns of genomic variation consistent with ongoing introgression. Strikingly, admixed individuals vary continuously from highly admixed to nearly pure M. guttatus, demonstrating ongoing hybridization and asymmetric introgression from M. nasutus into M. guttatus. Patterns of admixture and divergence across the genome show that levels of introgression are more variable than expected by chance. Some genomic regions show a reduced introgression, including one region that overlaps a critical photoperiod QTL, whereas other regions show elevated levels of interspecific gene flow. In addition, we observe a genome-wide negative relationship between absolute divergence and the local recombination rate, potentially indicating natural selection a…
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Introgression is reduced for genes or genomic regions underlying RI.
“As well, introgression is reduced for genes or genomic regions underlying RI (Barb et al., 2014; Kenney and Sweigart, 2016; Todesco et al., 2020).”
From Genomics of plant speciation (2023) · cites this paper as Kenney and Sweigart, 2016
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- Authors
- Kenney, A. M., & Sweigart, A. L.
- Affiliations
- University of Georgia (US)
- Corresponding author
- Kenney, Amanda M.
- Venue
- Molecular Ecology
- Publisher
- Wiley
- Published
- 2016-05-11
- Volume
- 25
- Issue
- 11
- Pages
- 2499-2517
- ISSN
- 0962-1083 (ISSN-L)
- 1365-294X
- OpenAlex
- W2328264703
- Cited by
- 76
- References
- 113
- Citations by year
- 2026: 5 · 2025: 4 · 2024: 8 · 2023: 6 · 2022: 7 · 2021: 6 · 2020: 7 · 2019: 7 · 2018: 13 · 2017: 4 · 2016: 9
- FWCI
- 8.88
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Molecular Ecology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Foundation (DEB‐1350935, DEB-1350935)
- University of Georgia Research Foundation
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Chromosomal and Genetic Variations
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
- Keywords
- reproductive isolation, introgression, sympatric speciation, Mimulus guttatus, hybridization, photoperiod, self-pollination, outcrossing, admixture, genomic divergence, recombination rate, natural selection, interspecific gene flow, secondary contact
- MeSH terms
- Genetics, Population, Hybridization, Genetic, Sequence Analysis, DNA, Photoperiod, DNA, Plant, Genome, Plant, Mimulus, Flowers, Quantitative Trait Loci, Genetic Speciation, Gene Flow, Reproductive Isolation, Sympatry
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