Abstract Detail

Phylogeny and evolution of angiosperms in the era of next generation sequencing

Soltis, Pamela S. [1].

Phylogenomics of Angiosperms: Where Do We Go From Here?

The 1KP initiative provides transcriptome resources and phylogenetic inference across the approximately half a billion species of Viridiplantae. Angiosperms represent ~3/4 of Viridiplantae and account for ~2/3 of the transcriptomes assembled by 1KP. Phylogenomic analyses using a supermatrix comprising ~800 species of angiosperms and over 400 nuclear genes and a coalescent approach provide comprehensive views of evolutionary history from the perspective of the nuclear genome. Notable phylogenetic results include: Amborella sister to all other extant angiosperms, with subsequent divergence of Nymphaeales and Austrobaileyales prior to the radiation of Mesangiospermae, within which relationships remain poorly resolved and/or supported. Ceratophyllaceae are sister to all other mesangiosperms, with monocots sister to a clade of magnoliids + (Chloranthales + eudicots), but with weak support. Within magnoliids, there is strong support for Magnoliales + Laurales sister to Piperales + Canellales. Relationships among basal eudicots are not strongly supported, but Trochodendraceae are sister to Buxaceae + core eudicots. Within core eudicots, there is general support for Superrosidae and Superasteridae, although the placement of Santalales within Superrosidae requires further attention. As found previously with nuclear data, the COM clade of Rosidae is sister to malvids, whereas nearly complete plastomes place it with fabids. Other key points of angiosperm phylogeny will be discussed and comparisons made between nuclear and plastid trees. The transcriptome resources of 1kp can be used in a variety of ways, at both deep and shallow evolutionary scales, and provide for discovery of putatively single-copy nuclear genes for use in phylogeny reconstruction of other groups. With the 1KP phylogeny as a framework, we evaluate remaining problematic areas of the angiosperm tree and suggest future approaches to integrate with other data.

1 - Florida Museum of Natural History, University of Florida, 1659 Museum Road, Gainesville, Florida, 32611, United States

Keywords:
angiosperms
phylogeny
transcriptomics.

Presentation Type: Symposium Presentation
Session: SY6, Phylogeny and evolution of angiosperms in the era of next generation sequencing
Location: 102/Mayo Civic Center
Date: Wednesday, July 25th, 2018
Time: 2:45 PM
Number: SY6004
Abstract ID:950
Candidate for Awards:None