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dc.contributor.authorHODKINSON, TREVORen
dc.contributor.editor42en
dc.date.accessioned2015-02-17T17:10:45Z
dc.date.available2015-02-17T17:10:45Z
dc.date.issued2014en
dc.date.submitted2014en
dc.identifier.citationEstep M, McKain MR, Diaz DV, Zhong J, Hodge JG, Hodkinson TR, Layton D, Malcomber S, Pasqueth R, Kellogg EA, Allopolyploidy, diversification, and the Miocene grassland expansion, Proceedings of the National Academy of Sciences USA, Proceedings of the National Academy of Sciences USA, 11, 42, 2014, 15149-15154en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/73277
dc.descriptionPUBLISHEDen
dc.description11en
dc.description.abstractThe role of polyploidy, particularly allopolyploidy, in plant diversification is a subject of debate. Whole-genome duplications precede the origins of many major clades (e.g., angiosperms, Brassicaceae, Poaceae), suggesting that polyploidy drives diversification. However, theoretical arguments and empirical studies suggest that polyploid lineages may actually have lower speciation rates and higher extinction rates than diploid lineages. We focus here on the grass tribe Andropogoneae, an economically and ecologically important group of C4 species with a high frequency of polyploids. A phylogeny was constructed for ca. 10% of the species of the clade, based on sequences of four concatenated low-copy nuclear loci. Genetic allopolyploidy was documented using the characteristic pattern of double-labeled gene trees. At least 32% of the species sampled are the result of genetic allopolyploidy and result from 28 distinct tetraploidy events plus an additional six hexaploidy events. This number is a minimum, and the actual frequency could be considerably higher. The parental genomes of most Andropogoneae polyploids diverged in the Late Miocene coincident with the expansion of the major C4 grasslands that dominate the earth today. The well-documented whole-genome duplication in Zea mays ssp. mays occurred after the divergence of Zea and Sorghum. We find no evidence that polyploidization is followed by an increase in net diversification rate; nonetheless, allopolyploidy itself is a major mode of speciationen
dc.description.sponsorshipThis study was supported National Science Foundation Grants DBI-0604923 and DEB-11456884 (to E.A.K.) and by the E. Desmond Lee and Family Endowment at the University of Missouri–St. Louis.en
dc.format.extent15149-15154en
dc.language.isoenen
dc.rightsYen
dc.subjectsix hexaploidyen
dc.subject.lcshsix hexaploidyen
dc.titleAllopolyploidy, diversification, and the Miocene grassland expansionen
dc.title.alternativeProceedings of the National Academy of Sciences USAen
dc.title.alternativeProceedings of the National Academy of Sciences USAen
dc.typeConference Paperen
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/hodkinsten
dc.identifier.rssinternalid97139en
dc.identifier.doihttp://dx.doi.org/10.1073/pnas.1404177111en
dc.rights.ecaccessrightsopenAccess
dc.subject.TCDThemeGenes & Societyen
dc.subject.TCDThemeSmart & Sustainable Planeten
dc.subject.TCDTagBiodiversity and Conservationen
dc.identifier.rssurihttp://www.pnas.org/cgi/doi/10.1073/pnas.1404177111en


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