Hybrid fitness across time and habitats

Arnold, Michael L.; Martin, Noland H.

doi:10.1016/j.tree.2010.06.005

Cited by 166 publications

(156 citation statements)

References 45 publications

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“…Natural hybridization creates recombinants from interspecific mating between divergent parental taxa when they come into geographic contact (Arnold and Martin 2010;Lexer and Widmer 2008). Hybridization has various evolutionary consequences for the taxa involved (Baack and Rieseberg 2007).…”

Section: Introductionmentioning

confidence: 99%

Hybridization in contact zone between temperate European pine species

Wachowiak

Żukowska

Wójkiewicz

et al. 2016

Tree Genetics & Genomes

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Hybridization studies are important to advance our understanding of the interspecific gene flow and its evolutionary consequences in closely related species. Hybridization and admixture patterns were assessed in a contact zone and reference populations of European pine species using sequence data from 26 nuclear genes and a species-diagnostic cpDNA marker. Reference populations formed three distinct genetic clusters comprising Pinus sylvestris, Pinus mugo/Pinus uliginosa, and Pinus uncinata. Evidence of population structure was found only in P. uliginosa. Based on phenotypic characteristics and molecular data, we identified five groups of individuals in the contact zone in Poland, comprising forms of the parental species and intermediates that were most probably the result of interspecific crosses. A combination of nuclear gene sequence data and a diagnostic organelle marker were used to show that hybridization is frequent in the contact zone and results in hybrid trees with distinct phenotypic identity. The influence of selection in maintaining hybrid phenotypes in environments unsuited to parental species was inferred from nucleotide polymorphism data. A lack of admixture in reference populations suggests that hybridization has not occurred during post-glacial migration and so the contact zone represents a distinct, active example of ongoing evolution. Pine populations in this zone will be a valuable system for studying the genetic basis of hybrid advantage in environmental conditions untypical of pure parental species.

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Section: Introductionmentioning

confidence: 99%

Hybridization in contact zone between temperate European pine species

Wachowiak

Żukowska

Wójkiewicz

et al. 2016

Tree Genetics & Genomes

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“…Hybrid vigor can sometimes be observed by breeding different species, in a manner similar to heterosis, obtained by breeding distinct genetically pure lines within a species. But interspecies hybridization is intrinsically prone to eroding established gene pools in organisms with obligate sexual reproduction (7). With their ability for indefinite clonal propagation and generally weak prezygotic barriers, yeasts and also many fungi offer specific interests for studying the general problem of interspecies hybridization.…”

Section: Introductionmentioning

confidence: 99%

Evolutionary Role of Interspecies Hybridization and Genetic Exchanges in Yeasts

Morales

Dujon

2012

Microbiol Mol Biol Rev

155

158

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SUMMARYForced interspecific hybridization has been used in yeasts for many years to study speciation or to construct artificial strains with novel fermentative and metabolic properties. Recent genome analyses indicate that natural hybrids are also generated spontaneously between yeasts belonging to distinct species, creating lineages with novel phenotypes, varied genetic stability, or altered virulence in the case of pathogens. Large segmental introgressions from evolutionarily distant species are also visible in some yeast genomes, suggesting that interspecific genetic exchanges occur during evolution. The origin of this phenomenon remains unclear, but it is likely based on weak prezygotic barriers, limited Dobzhansky-Muller (DM) incompatibilities, and rapid clonal expansions. Newly formed interspecies hybrids suffer rapid changes in the genetic contribution of each parent, including chromosome loss or aneuploidy, translocations, and loss of heterozygosity, that, except in a few recently studied cases, remain to be characterized more precisely at the genomic level by use of modern technologies. We review here known cases of natural or artificially formed interspecies hybrids between yeasts and discuss their potential importance in terms of genome evolution. Problems of meiotic fertility, ploidy constraint, gene and gene product compatibility, and nucleomitochondrial interactions are discussed and placed in the context of other known mechanisms of yeast genome evolution as a model for eukaryotes.

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“…Natural hybridisation is an important process that creates recombinants from interspecific mating between divergent parental taxa where they come into geographic contact (Arnold and Martin 2010). Hybridization occurs in roughly 10 % of animal species and 25 % of plant species and it may have various evolutionary consequences for the taxa involved (Baack and Rieseberg 2007).…”

Section: Introductionmentioning

confidence: 99%

Interspecific gene flow and ecological selection in a pine (Pinus sp.) contact zone

2014

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Nucleotide polymorphisms in a set of nuclear genes were studied in a sympatric population of pines Pinus mugo and Pinus sylvestris that includes trees classified as pure species and polycormic (multi-stemmed) individuals of potentially hybrid origin. Patterns of genetic diversity were compared between those groups of samples and to the reference allopatric populations of the species in Europe. Polymorphisms at the gene loci clearly distinguished pure parental species as measured by conventional frequency-based statistics and Bayesian assignment of samples into separate genetic clusters. Most individuals classified based on phenotypic assessments as putative hybrids were genetically very similar to P. mugo showing no existing average net divergence and genetic assignment to the same genetic cluster. On the other hand, individuals of P. sylvestris showed homogenous genetic background to the reference populations of the species from Central and Northern Europe. Ten individuals of admixed genetic composition were found in all three groups of samples; however, the majority of hybrids except one individual were identified across the samples classified as P. mugo and polycormic pines. Those trees that contained a mixture of nuclear gene haplotypes observed in the reference populations of pure species and cpDNA from P. mugo, most likely represent the first generation of hybrids. Analysis of the allelic frequency spectra and compound neutrality tests identified deviations from neutrality at several genes. This contact zone seems suitable for selection of a mapping population both in hybrid and parental species for admixture mapping to effectively search for polymorphisms that may play role in species adaptive variation and speciation.

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Hybrid fitness across time and habitats

Cited by 166 publications

References 45 publications

Hybridization in contact zone between temperate European pine species

Hybridization in contact zone between temperate European pine species

Evolutionary Role of Interspecies Hybridization and Genetic Exchanges in Yeasts

Interspecific gene flow and ecological selection in a pine (Pinus sp.) contact zone

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