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Abstract Detail



Evolutionary Developmental Biology (Evo-Devo)

Hernandez, Margarita [1], Landis, Jacob [2], Soltis, Douglas [3], Soltis, Pamela S. [4].

Leptosiphon and flower color: investigating color acquisition in Polemoniaceae using phylogenetics.

Transitions in flower color are asymmetric over evolutionary time, with some transitions more favorable than others. Several selective pressures and mechanisms involving pollinators often drive these color changes, while other forces such as genetic drift and pleiotropic effects may drive others. In this project, we investigated transitions in flower color in Leptosiphon (Polemoniaceae). Leptosiphon comprises 38 species and has a center of distribution in California. Based on our initial analyses, it appears that flower color (blue/purple, pink, and yellow) has been gained in many independent transitions from a white-flowered ancestor. A well-supported species-level phylogeny will allow for better mapping of floral characteristics. To refine phylogenetic relationships, plant material was obtained from field, herbaria, and greenhouse collections for 168 accessions, representing the currently recognized species. Of these accessions, 22 were used initially for phylogenetic analysis using both nuclear and chloroplast DNA. Large portions of chloroplast genomes were sequenced, reads were assembled, and phylogenetic analyses were conducted on a concatenated dataset of chloroplast genes. The published plastome of Camellia sinensis was used as an outgroup. Gene tree/species tree reconciliation was performed with the nuclear data sets after on-target genes were filtered using baits for 100 nuclear genes. Ancestral state reconstructions were conducted for flower color on the completed phylogeny, supporting a white-flowered ancestor for the genus. The phylogenies for the nuclear and plastid data sets were compared, highlighting advantages and disadvantages of each kind of data for interspecies phylogenetic analysis.


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1 - University of Florida, Florida Museum of Natural History , Dickinson Hall , 1695 Museum Road, Gainesville, FL, 32611
2 - University Of Florida, Dept Of Biology, Florida Museum Of Natural History - Dickinson Hall, Museum Road And Newell Drive, Gainesville, FL, 32611, USA
3 - University of Florida, Florida Museum of Natural History, 1659 Museum Road, Dickinson Hall, Gainesville, FL, 32611, USA
4 - University Of Florida, Florida Museum Of Natural History, PO Box 117800, Gainesville, FL, 32611-7800, USA, 352/273-1964

Keywords:
Polemoniaceae
Leptosiphon
flower color
Phylogenetics.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PEV004
Abstract ID:978
Candidate for Awards:None


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