Dating the Species Network: Allopolyploidy and Repetitive DNA Evolution in American Daisies (Melampodium sect. Melampodium, Asteraceae)

Show simple item record McCann, J en Jang, T-S en Macas, J en Schneeweiss, GM en Matzke, Nicholas en Novák, P en Stuessy, TF en Villaseñor, JL en Weiss-Schneeweiss, H en 2018-10-31T21:58:44Z en 2018-03-19 en
dc.identifier.citation Systematic biology 67(6):1010-1024 Nov 2018 en
dc.identifier.issn 1063-5157 en
dc.identifier.uri en
dc.description.abstract Allopolyploidy has played an important role in the evolution of the flowering plants. Genome mergers are often accompanied by significant and rapid alterations of genome size and structure via chromosomal rearrangements and altered dynamics of tandem and dispersed repetitive DNA families. Recent developments in sequencing technologies and bioinformatic methods allow for a comprehensive investigation of the repetitive component of plant genomes. Interpretation of evolutionary dynamics following allopolyploidization requires both the knowledge of parentage and the age of origin of an allopolyploid. Whereas parentage is typically inferred from cytogenetic and phylogenetic data, age inference is hampered by the reticulate nature of the phylogenetic relationships. Treating subgenomes of allopolyploids as if they belonged to different species (i.e., no recombination among subgenomes) and applying cross-bracing (i.e., putting a constraint on the age difference of nodes pertaining to the same event), we can infer the age of allopolyploids within the framework of the multi-species coalescent within BEAST2. Together with a comprehensive characterization of the repetitive DNA fraction using the RepeatExplorer pipeline, we apply the dating approach in a group of closely related allopolyploids and their progenitor species in the plant genus Melampodium (Asteraceae). We dated the origin of both the allotetraploid, M. strigosum, and its two allohexaploid derivatives, M. pringlei and M. sericeum, which share both parentage and the direction of the cross, to the Pleistocene (less than 1.4 Ma). Thus, Pleistocene climatic fluctuations may have triggered formation of allopolyploids possibly in short intervals, contributing to difficulties in inferring the precise temporal order of allopolyploid species divergence of M. sericeum and M. pringlei. The relatively recent origin of the allopolyploids likely played a role in the near-absence of major changes in the repetitive fraction of the polyploids’ genomes. The repetitive elements most affected by the post-polyploidization changes represented retrotransposons of the Ty1-copia lineage Maximus and, to a lesser extent, also Athila elements of Ty3-gypsy family. en
dc.publisher Oxford University Press (OUP) en
dc.relation.ispartofseries Systematic Biology en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.rights.uri en
dc.title Dating the Species Network: Allopolyploidy and Repetitive DNA Evolution in American Daisies (Melampodium sect. Melampodium, Asteraceae) en
dc.type Journal Article en
dc.identifier.doi 10.1093/sysbio/syy024 en
pubs.issue 6 en
pubs.begin-page 1010 en
pubs.volume 67 en
dc.rights.holder Copyright: The authors en
dc.identifier.pmid 29562303 en
pubs.end-page 1024 en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 733164 en Science en Biological Sciences en
pubs.record-created-at-source-date 2018-03-26 en 2018-03-19 en
pubs.dimensions-id 29562303 en

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