Multilocus analysis of genetic divergence between outcrossing Arabidopsis species: evidence of genome-wide admixture

Wang, Wei-Kuang; Ho, Chuan-Wen; Hung, Kuo-Hsiang; Wang, Kuo-Hsiung; Huang, Chi-Chun; Araki, Hitoshi; Hwang, Chi-Chuan; Hsu, Tsai-Wen; Osada, Naoki; Chiang, Tzen-Yuh (2010). Multilocus analysis of genetic divergence between outcrossing Arabidopsis species: evidence of genome-wide admixture. New Phytologist, 188(2), pp. 488-500. Oxford: Wiley-Blackwell 10.1111/j.1469-8137.2010.03383.x

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P>Outcrossing Arabidopsis species that diverged from their inbreeding relative Arabidopsis thaliana 5 million yr ago and display a biogeographical pattern of interspecific sympatry vs intraspecific allopatry provides an ideal model for studying impacts of gene introgression and polyploidization on species diversification. Flow cytometry analyses detected ploidy polymorphisms of 2x and 4x in Arabidopsis lyrata ssp. kamchatica of Taiwan. Genomic divergence between species/subspecies was estimated based on 98 randomly chosen nuclear genes. Multilocus analyses revealed a mosaic genome in diploid A. l. kamchatica composed of Arabidopsis halleri-like and A. lyrata-like alleles. Coalescent analyses suggest that the segregation of ancestral polymorphisms alone cannot explain the high inconsistency between gene trees across loci, and that gene introgression via diploid A. l. kamchatica likely distorts the molecular phylogenies of Arabidopsis species. However, not all genes migrated across species freely. Gene ontology analyses suggested that some nonmigrating genes were constrained by natural selection. High levels of estimated ancestral polymorphisms between A. halleri and A. lyrata suggest that gene flow between these species has not completely ceased since their initial isolation. Polymorphism data of extant populations also imply recent gene flow between the species. Our study reveals that interspecific gene flow affects the genome evolution in Arabidopsis.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE)

UniBE Contributor:

Araki, Hitoshi

ISSN:

0028-646X

Publisher:

Wiley-Blackwell

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:17

Last Modified:

10 Jul 2015 14:38

Publisher DOI:

10.1111/j.1469-8137.2010.03383.x

Web of Science ID:

000282225000018

URI:

https://boris.unibe.ch/id/eprint/5264 (FactScience: 210000)

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