Claim · model-written summary
The three M. guttatus founders differ strongly in admixture history, with nearly a quarter of one founder genome introgressed from M. nasutus.
- Taxon
- M. guttatus
Erythranthe guttatae1 - Interactor
- M. nasutus
Erythranthe nasutae1other - Outcome
- admixture historye1
- Value
- nearly a quartere1
Verbatim
e1“We discover that the three M. guttatus founders differ dramatically in admixture history, with nearly a quarter of one founder's genome introgressed from M. nasutus”
Title
Postzygotic barriers persist despite ongoing introgression in hybridizing Mimulus species
Samuel J. Mantel; Andrea L. Sweigart Molecular Ecology 2024. doi:10.1111/mec.17261
Other claims from this paper (12)
- Observation Comparative genetic mapping reveals three new putative inversions, each segregating among the M. guttatus founders.
- Observation Two of the new putative inversions are due to admixture.
- Observation Strong, genome-wide transmission ratio distortion occurs in all RILs.
- Observation Patterns of distortion are highly variable among the three populations.
- Mechanism At least some distortion appears to be explained by epistatic selection favouring parental genotypes.
- Observation Tests of inter-chromosomal linkage disequilibrium reveal multiple candidate Dobzhansky-Muller incompatibilities.
- Observation Several genetic loci for hybrid pollen viability are mapped.
- Observation Two interacting pairs of loci coincide with peaks of transmission ratio distortion.
- Observation Abundant segregating variation for hybrid incompatibilities with M. nasutus is found even in three M. guttatus lines.
- Mechanism The population harbours diverse contributors to postzygotic isolation.
- Observation Hybrid incompatibilities between Mimulus species persist even with substantial admixture.
- Mechanism Postzygotic isolation might be a potent force in maintaining species barriers in this system.