Abstract Detail

Systematics

Tepe, Eric [1], Uckele, Kathryn [2], Parchman, Thomas [2].

New insights into the phylogeny of New World Piper based on genome-wide RAD sequence data.

The pan-tropical genus Piper remains the least understood of the ‘giant genera’ of plants, and one the largest genera lacking a well-supported and formalized infrageneric classification. Several earlier authors proposed dividing Piper among a number of sections, subgenera, or segregate genera, and the monophyly of many of these have been supported by molecular data. Some lineages, however, have been poorly supported, and as a result, relationships among lineages remain enigmatic. Our current phylogeny includes 147 accessions of Piperfrom the Neotropics, and after results were filtered for quality, high levels of heterozygosity, and low sequence depth, is based on 1,938,772 SNPs. The phylogeny largely agrees with previously published phylogenies of Piper, but improves on both resolution and support. In previous phylogenies, the cladesChurumayu, Isophyllon, Peltobryon, Pothomorphe, Macrostachys, and Radula were in a large polytomy. Our results suggest that the major clades of Piper form a grade with Schilleria as sister to all other New World Piper. Enckea and Ottonia form a moderately supported clade, followed by a clade made up of Peltobryon and Pothomorphe. Monophyly of each of these last two sections is strongly supported, but the relationship between the two is not. Hemipodium and Macrostachys, as supported in all previous analyses, are strongly supported as a clade and as reciprocally monophyletic. Some previous analyses hinted that the clades Churumayu and Isophyllon represented morphologically distinct lineages nested within a larger Radula, but our RAD sequence data suggest that they are in fact discrete lineages with Isophyllon as the sister group to Radula, and Churumayu sister to Isophyllon+ Radula. Support for these relationships is strong.

1 - University Of Cincinnati, Department Of Biological Sciences, 614 Rieveschl Hall, Cincinnati, OH, 45221, United States
2 - University of Nevada Reno, Biology, 1664 N. Virginia Street, Reno, NV, 89503, USA

Keywords:
giant genus
Neotropics
NGS
Piperaceae
Systematics.

Presentation Type: Poster
Session: P, Systematics
Location: Grand Ballroom - Exhibit Hall/Mayo Civic Center
Date: Monday, July 23rd, 2018
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: PSY002
Abstract ID:504
Candidate for Awards:None