Abstract Detail

Phylogenomics

Baldwin, Ethan [1].

Rampant ongoing chloroplast capture revealed by Sarracenia plastome phylogeny.

Sarracenia is a genus of insectivorous pitcher plants native to eastern North America. Nuclear gene phylogeny estimation has been successful in resolving many evolutionary relationships within the genus. Attempts to estimate plastid phylogenies have been less successful, with many species that are well-resolved clades in nuclear trees being polyphyletic in plastid trees. It has been suggested that this discordance between plastid and nuclear phylogenies is due to the recent divergence in the genus and slower comparative substitution rate in the plastome, resulting in too few informative polymorphisms to estimate a well-resolved tree. Although there certainly are fewer informative sites and shorter branch lengths in the plastid trees, this does not explain well-supported discordant topologies. Another factor that could explain the conflicting topologies is chloroplast capture. All sympatric species in the genus have been observed to form fertile hybrids, making chloroplast capture, in some degree, an inevitability. The goals of this study are to (1) improve the resolution of published plastid phylogenies, and (2) interpreting conflicts between the plastome and nuclear species phylogenies. To address the first goal, whole or near-whole plastomes are assembled from 92 individuals including those used in previous studies. Assemblies are annotated, and CDS are aligned and concatenated for maximum-likelihood phylogeny estimation. Alternative hypotheses for plastome, individual nuclear gene, and species tree estimates will be discussed.

1 - 750 Gaines School Rd, Apt G119, Athens, GA, 30605, United States

Keywords:
chloroplast
Plastome
carnivorous plant
hybridization.

Presentation Type: Poster
Session: P3, Phylogenomics Posters
Location: Virtual/Virtual
Date: Wednesday, July 21st, 2021
Time: 5:00 PM(EDT)
Number: P3PL019
Abstract ID:651
Candidate for Awards:None