Geographical variation in postzygotic isolation and its genetic basis within and between two<i>Mimulus</i>species

Martin, Noland H.; Willis, John H.

doi:10.1098/rstb.2010.0030

Cited by 58 publications

(52 citation statements)

References 38 publications

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“…In Mimulus, cryptic CMS occurs in crosses of M. nasutus to several M. guttatus populations with distinct mitochondrial haplotypes (C. M. Barr, L. Fishman and A. L. Case 2016, unpublished data) and also in a few within-guttatus hybrids [51], but each CMS type appears restricted to a small geographical area. Similar patterns are seen in other taxa (e.g.…”

Section: Discussionmentioning

confidence: 99%

Selfish evolution of cytonuclear hybrid incompatibility inMimulus

et al. 2016

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Intraspecific coevolution between selfish elements and suppressors may promote interspecific hybrid incompatibility, but evidence of this process is rare. Here, we use genomic data to test alternative models for the evolution of cytonuclear hybrid male sterility in Mimulus. In hybrids between Iron Mountain (IM) Mimulus guttatus Â Mimulus nasutus, two tightly linked M. guttatus alleles (Rf1/Rf2) each restore male fertility by suppressing a local mitochondrial male-sterility gene (IM-CMS). Unlike neutral models for the evolution of hybrid incompatibility loci, selfish evolution predicts that the Rf alleles experienced strong selection in the presence of IM-CMS. Using whole-genome sequences, we compared patterns of population-genetic variation in Rf at IM to a neighbouring population that lacks IM-CMS. Consistent with local selection in the presence of IM-CMS, the Rf region shows elevated F ST , high local linkage disequilibrium and a distinct haplotype structure at IM, but not at Cone Peak (CP), suggesting a recent sweep in the presence of IM-CMS. In both populations, Rf2 exhibited lower polymorphism than other regions, but the low-diversity outliers were different between CP and IM. Our results confirm theoretical predictions of ubiquitous cytonuclear conflict in plants and provide a population-genetic mechanism for the evolution of a common form of hybrid incompatibility.

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Section: Discussionmentioning

confidence: 99%

Selfish evolution of cytonuclear hybrid incompatibility inMimulus

et al. 2016

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“…Studies on reinforcement in plants are restricted to a few species and found no supporting evidence (Moyle et al, 2004). More recently, attention has been focused on the genetic base of postzygotic isolation in plants (Costa et al, 2007;Skrede et al, 2008;Martin & Willis, 2010). For logistic reasons, studies of postzygotic isolation are generally conducted in simple laboratory environments and, understandably, they tend to focus on intrinsic components of postzygotic isolation (e.g.…”

Section: Introductionmentioning

confidence: 97%

Relationship between genetic distances and postzygotic reproductive isolation in diploid Fragaria (Rosaceae)

Nosrati

Price

Wilcock

2011

Biological Journal of the Linnean Society

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Studies of reproductive isolation are important for understanding speciation and species delimitation. We studied seven components of reproductive isolation at different taxonomic and geographical levels and their relationship with genetic distance in diploid Fragaria. Isolation was only evident between different taxa at later stages (post F1 survivorship), and not at the earlier ones of fruit and seed set, F1 seed germination, and survivorship. Within Fragaria vesca, isolation at the later stages was positively correlated with genetic distance, although this was not found at interspecific levels. The lack of isolation between F. vesca and the other species at the early stages provide the chance for hybrid formation, although high levels of infertility expressed among the offspring can lead to potentially opposing evolutionary outcomes. Within F. vesca, there was evidence of unexpected isolation promoting evolutionary diversification and incipient speciation. Reproductive isolation values between sympatric and allopatric species pairs were similar and indicate a lack of reinforcement in Fragaria. This, combined with the lack of correlation between genetic distance and isolation at interspecific levels, shows that genetic distance is not always proportionally correlated with the degree of isolation in plants and suggests that evolutionary processes may be playing differently in plants compared to animals.

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“…In Mimulus guttatus, one of the parental species of M. peregrinus, reduced pollen viability is sometimes expressed in interpopulation crosses (Fishman and Willis 2006;Sweigart et al 2007). Reduced pollen fertility in intraspecific crosses of M. guttatus is thought to arise through Dobzhansky-Muller incompatibilities between populations either from nuclear-nuclear or nuclear-cytoplasmic interactions (Martin and Willis 2010). Mimulus peregrinus could inherit these preexisting genetic incompatibilities from its parental taxa causing lower pollen fertility when independently originated populations are crossed.…”

Section: Interfertility Of Mimulus Peregrinus Of Independent Originmentioning

confidence: 99%

“…On the other hand, independently originated populations may be isolated from each other by postzygotic reproductive barriers due to genetic or chromosomal incompatibilities that either predate the polyploidisation event or evolve subsequently. For example, nuclear-nuclear and nuclear-cytoplasmic incompatibilities within or between species can result in postzygotic isolation barriers among genetically differentiated populations (Levin 2003;Coyne and Orr 2004;Martin and Willis 2010;Burton et al 2013;Lindtke and Buerkle 2015). If genetically distinct parental populations of a given parental taxon give rise to separate polyploids, the derived polyploids may be reproductively isolated upon secondary contact.…”

Section: Introductionmentioning

confidence: 99%

Partial interfertility between independently originated populations of the neo-allopolyploid Mimulus peregrinus

et al. 2017

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The reduction in genetic diversity in polyploid lineages, formed from whole-genome duplication of a few individuals, can affect their long-term evolutionary potential. Because most polyploids originate multiple times, secondary contact and gene exchange among independently formed polyploids can create novel genetic combinations and reduce the severity of genetic bottlenecks. However, independently originated polyploids may be reproductively isolated from each other due to genetic and chromosomal differences predating the polyploidisation event, or evolving subsequently in the dynamic genomes of young polyploid populations. Here we conducted experimental crosses to investigate the phenotype and interfertility between two independently originated populations of the allopolyploid Mimulus peregrinus (Phrymaceae). We found that individuals from the two populations are phenotypically distinct, but that inter-and intrapopulation crosses are not statistically different. Interpopulation crosses produce viable and fertile offspring, although our results suggest the existence of partial reproductive barriers in the form of reduced pollen viability. We found no difference in pollen viability between F1 and F2 generations. In contrast, we detected a reduction in floral and vegetative size, and in the proportion of plants that flowered, between F1 and F2 generations for both intra-and interpopulation crosses. Together, our results indicate that populations of independent origin can partially exchange genes, producing variable offspring, and that the phenotype of M. peregrinus may be unstable in the early generations. Natural selection on genetically based variation may be required for the evolution of more stable and fertile individuals of this nascent allopolyploid.

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Geographical variation in postzygotic isolation and its genetic basis within and between twoMimulusspecies

Cited by 58 publications

References 38 publications

Selfish evolution of cytonuclear hybrid incompatibility inMimulus

Selfish evolution of cytonuclear hybrid incompatibility inMimulus

Relationship between genetic distances and postzygotic reproductive isolation in diploid Fragaria (Rosaceae)

Partial interfertility between independently originated populations of the neo-allopolyploid Mimulus peregrinus

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