Whole plastome sequencing reveals deep plastid divergence and cytonuclear discordance between closely related balsam poplars, Populus balsamifera and P. trichocarpa (Salicaceae)
© 2014 The Authors. New Phytologist © 2014 New Phytologist Trust.
| Publié dans: | The New phytologist. - 1979. - 204(2014), 3 vom: 17. Nov., Seite 693-703 |
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| Auteur principal: | |
| Autres auteurs: | , , , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2014
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| Accès à la collection: | The New phytologist |
| Sujets: | Journal Article Research Support, Non-U.S. Gov't Populus Salix cytonuclear discordance phylogenomics plastome |
| Résumé: | © 2014 The Authors. New Phytologist © 2014 New Phytologist Trust. As molecular phylogenetic analyses incorporate ever-greater numbers of loci, cases of cytonuclear discordance - the phenomenon in which nuclear gene trees deviate significantly from organellar gene trees - are being reported more frequently. Plant examples of topological discordance, caused by recent hybridization between extant species, are well known. However, examples of branch-length discordance are less reported in plants relative to animals. We use a combination of de novo assembly and reference-based mapping using short-read shotgun sequences to construct a robust phylogeny of the plastome for multiple individuals of all the common Populus species in North America. We demonstrate a case of strikingly high plastome divergence, in contrast to little nuclear genome divergence, in two closely related balsam poplars, Populus balsamifera and Populus trichocarpa (Populus balsamifera ssp. trichocarpa). Previous studies with nuclear loci indicate that the two species (or subspecies) diverged since the late Pleistocene, whereas their plastomes indicate deep divergence, dating to at least the Pliocene (6-7 Myr ago). Our finding is in marked contrast to the estimated Pleistocene divergence of the nuclear genomes, previously calculated at 75 000 yr ago, suggesting plastid capture from a 'ghost lineage' of a now-extinct North American poplar |
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| Description: | Date Completed 01.06.2015 Date Revised 16.04.2021 published: Print-Electronic GENBANK: EF489041, KJ664926, KJ664927, KJ742926 Citation Status MEDLINE |
| ISSN: | 1469-8137 |
| DOI: | 10.1111/nph.12956 |