Abstract Detail

Systematics

Majure, Lucas [1], Neubig, Kurt Maximillian [2], Abbott, J. Richard [3], Naczi, Robert [3], Judd, Walter [4], Whitten, W. Mark [5].

A preliminary look at phylogenetic relationships of Dichanthelium (Paniceae: Poaceae).

Dichanthelium is distributed throughout the Americas and Hawaii, with its highest species diversity in the eastern United States. Species delimitation within the genus is contentious, with most floristic treatments differing drastically in the number and circumscription of species. Low levels of sequence divergence with conventional molecular markers result in poor resolution at deep phylogenetic levels. Therefore, we used a two-fold approach to reconstruct phylogenetic relationships in Dichanthelium. First, using Illumina HiSeq sequencing technology, we “genome skimmed” plastomes without enrichment for >60 samples, often with more than one sample per species. Second, using Sanger sequencing, we sequenced ITS, GBSSI, and rpl32-trnL for over 300 samples, usually with several samples per species. In combination, these datasets provide support for broad relationships and monophyly in Dichanthelium. However, several species appear to be polyphyletic, such as D. commutatum and D. acuminatum, among others. We hope that these phylogenetic data will help create a more stable classification scheme for the genus, as well as aid in our understanding of the biogeographic history of the group.

1 - Desert Botanical Garden, Department of Research, Conservation, and Collections, Phoenix, AZ, 85008, USA
2 - Southern Illinois University Carbondale, Plant Biology, Carbondale, IL, 62901, USA
3 - The New York Botanical Garden, Bronx, NY, 10458, USA
4 - University of Florida, Florida Museum of Natural History, Gainesville, FL, 32611, USA
5 - University Of Florida, Florida Museum Of Natural History, PO BOX 117800, Gainesville, FL, 32611-7800, USA, 352/273-1964

Keywords:
genome skimming
phylogenetics.

Presentation Type: Poster
Session: P, Systematics Section/ASPT Posters
Location: Exhibit Hall/Savannah International Trade and Convention Center
Date: Monday, August 1st, 2016
Time: 5:30 PM This poster will be presented at 6:15 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PSY018
Abstract ID:100
Candidate for Awards:None