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Abstract Detail


Patsis, Amanda [1], Overson, Rick [2], Johnson, Matt [2], Skogen, Krissa [3], Wagner, Warren [4], Raguso, Robert [5], Wickett, Norm [6], Levin, Rachel Ann [7].

Elucidating the evolutionary history of Oenothera sect. Pachylophus using phylogenomics.

The evening primrose family (Onagraceae) is comprised of 655 species, with 17 genera divided into 7 tribes. One tribe within the family, Onagreae, has emerged as an important system for the study of the evolution of floral traits in response to a diversity of plant-insect interactions. Within the tribe, Oenothera section Pachylophus has become the focus of ongoing studies regarding floral scent and plant-insect co-evolution. This section is found throughout western North America, and has traditionally been divided into five species based on morphological characteristics. Four of these species are narrow endemics, while the fifth is wide-ranging and highly polymorphic. Previous attempts to understand species relationships at a molecular level have been largely unsuccessful due to high levels of incomplete lineage sorting, hybridization, and an overall lack of phylogenetic signal within the section. In this study, we used next-generation phylogenomic techniques to resolve these previously recalcitrant nodes and create a more robust phylogenetic resource to inform ongoing work on character evolution in Onagreae. Forty-one samples spanning the geographic range of the section were analyzed using HybSeq, which combines target gene enrichment via hybridization and high throughput sequencing. This yielded high quality sequence data from 322 phylogenetically informative loci across the genome. Using data from both exonic and intronic regions, species trees were estimated using concatenation and maximum likelihood methods (RAxML), as well as coalescent-based methods (ASTRAL-II). Our findings challenge the monophyly of species as they are currently defined, with several narrow endemics being nested within the wide-ranging species. This suggests a need to re-evaluate taxon classifications within Oenothera sect. Pachylophus.

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1 - Amherst College, Biology, McGuire Life Sciences Building, Amherst, MA, 01002, USA
2 - Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, IL, 60022, USA
3 - Chicago Botanic Garden, Conservation Scientist, 1000 Lake Cook Road, Glencoe, IL, 60022, USA
4 - Smithsonian Institution, Botany, MRC-166 National Museum Of Natural History, PO Box 37012, WASHINGTON, DC, 20013-7012, USA
5 - Cornell University, Department Of Biological Sciences, W355 Mudd Hall, 215 Tower Road, Ithaca, NY, 14853, USA
6 - Chicago Botanic Garden, 1000 Lake Cook Rd., Apt 2, Glencoe, IL, 60022, USA
7 - Amherst College, Department Of Biology, McGuire Life Sciences Building, Amherst, MA, 01002, USA

evening primrose.

Presentation Type: Oral Paper
Session: 29, Phylogenomics I
Location: Fort Worth Ballroom 4/Omni Hotel
Date: Tuesday, June 27th, 2017
Time: 2:15 PM
Number: 29004
Abstract ID:95
Candidate for Awards:None

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