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  Hybridization and a loss of sex shape genome-wide diversity and the origin of species in the evening primroses (Oenothera, Onagraceae)

Hollister, J. D., Greiner, S., Johnson, M. T. J., & Wright, S. I. (2019). Hybridization and a loss of sex shape genome-wide diversity and the origin of species in the evening primroses (Oenothera, Onagraceae). New Phytologist, 224(3), 1372-1380. doi:10.1111/nph.16053.

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Hollister, Jesse D.1, Author
Greiner, S.2, Author              
Johnson, Marc T. J.1, Author
Wright, Stephen I.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Cytoplasmic and Evolutionary Genetics, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753324              

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Free keywords: asexual reproduction, hybridization, Oenothera, recombination, speciation, transcriptome sequencing
 Abstract: Summary Hybridization is thought to promote speciation in at least two ways – by fixation of heterozygosity from diploid progenitors in allopolyploids, and by generation of transgressive phenotypes and shifting fitness optima during homoploid hybrid speciation. While recent studies support a hybrid origin for a growing number of species, the extent to which hybrid origins shape patterns of diversity in asexual species remains underexplored. Here we employed transcriptome sequencing and population genomic analysis to describe patterns of genomic variation in the 13 species belonging to Oenothera subsection Oenothera. Eight of these species are functionally asexual and arose by hybrid speciation from parents spanning a range of phylogenetic divergence. We showed that genomic divergence between parents has been retained as heterozygosity in functionally asexual species, and that genome-wide levels of heterozygosity in these asexuals largely reflects the divergence of parental haplotypes coupled with a breakdown in recombination and segregation across the genome. These results show that divergence between parental species and loss of sex in hybrids shape patterns of whole-genome diversity and the origin of asexual species.

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Language(s): eng - English
 Dates: 20192019
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1111/nph.16053
BibTex Citekey: doi:10.1111/nph.16053
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Title: New Phytologist
  Other : New Phytol.
Source Genre: Journal
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Publ. Info: London : Academic Press.
Pages: - Volume / Issue: 224 (3) Sequence Number: - Start / End Page: 1372 - 1380 Identifier: ISSN: 0028-646X
CoNE: https://pure.mpg.de/cone/journals/resource/954925334695