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Abstract Detail


Wickett, Norman [1], Parks, Matthew [2], Johnson, Matthew [3], Mirarab, Siavash [4], Mai, Uyen [4], Peter, Szovenyi [5], Kirbis, Alexander [5], Waller, Manuel [5], Neubauer, Anna [5].

Testing the monophyly of bryophytes using expanded genome and transcriptome sampling.

Bryophytes comprise three monophyletic lineages: the mosses, liverworts, and hornworts. The extant members of one of these lineages, or some combination of the three, represent the sister group to the vascular plants and, as such, play a key role in understanding the evolution of terrestrial plants approximately 480 million years ago. Several molecular phylogenetic studies using chloroplast genomes and a limited set of nuclear genes in the past two decades led to the consensus view that bryophytes form a paraphyletic grade with liverworts and mosses successively sister to a clade composed of hornworts and vascular plants. However, alternative topologies have been proposed and supported by both molecular and morphological data sets. Recently, inferences made using hundreds of nuclear markers have suggested that the consensus view of successive sister groups might not represent the most strongly supported hypothesis. Instead, there is emerging support for the monophyly of mosses and liverworts. The placement of hornworts remains somewhat unstable, with some analyses supporting a monophyletic bryophytes in which the hornworts are sister to mosses and liverworts. Here, we explore the impact of increased sampling of bryophyte genomes and transcriptomes on the reconstruction of land plant relationships. In particular, we used the draft genome sequence of the hornwort Anthoceros agrestis to infer a novel set of orthologous genes and then assess the utility of gene genealogy interrogation to infer the phylogeny of land plants.

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1 - Chicago Botanic Garden, 1000 Lake Cook Rd., Glencoe, IL, 60022, United States
2 - Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, IL, 60022, United States
3 - Texas Tech University, Biological Sciences, 2901 Main Street, Ms3131, Lubbock, TX, 79409, United States
4 - UC San Diego, Electrical and Computer Engineering, La Jolla, CA, USA
5 - University of Zurich, Systematic and Evolutionary Botany, Zurich, Switzerland

land plants
gene tree conflict
gene genealogy interrogation
single-copy nuclear genes.

Presentation Type: Oral Paper
Session: 36, Phylogenomics III
Location: 107/Mayo Civic Center
Date: Wednesday, July 25th, 2018
Time: 10:30 AM
Number: 36009
Abstract ID:846
Candidate for Awards:None

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