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Abstract Detail

Genetics Section

Hansen, Kimberley [1], Ayers, Tina [2].

Reconstructing the Evolutionary History of the Cyphocarpoideae: Evidence for an Early and Rapid Diversification of the Campanulaceae.

The Campanulaceae is a family of flowering plants that is composed of five subfamilies and 2319 species. Approximately 97% of the diversity is confined to the subfamilies Campanuloideae and Lobelioideae which have diversified in the northern and southern hemispheres, respectively. Additionally, most of the published phylogenetic research within the Campanulaceae has focused on taxa within these two subfamilies. Subsequently, little is known about the three species that comprise the subfamily Cyphocarpoideae, which is restricted to the Atacama Desert of Chile, nor its relationship to the other subfamilies. Genomic DNA from forty phylogenetically diverse taxa was sequenced on the Illumina MiSeq and rDNA cistrons and plastomes were assembled. Entire rDNA cistrons were assembled, aligned and used to construct a maximum likelihood tree. Additionally, coding sequences were extracted from assembled chloroplast genomes, aligned, concatenated and used to construct a maximum likelihood tree. The relationships among the subfamilies were not well supported in either of the trees and the branch lengths of these deep nodes are extremely short. However, the monophyly of each subfamily is well supported in the cpDNA trees with the exception of Nemacladoideae, which was only weakly supported. The extremely short branch lengths suggest that the Campanulaceae underwent a rapid diversification early in its evolutionary history. Other current work in the family suggests the addition of more taxa, rather than data, may be the key to resolving these relationships using chloroplast data. Ubiquitous structural rearrangements in the chloroplast may also help elucidate phylogenetic relationships among the subfamilies.

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1 - Northern Arizona University, Biological Sciences Department, 617 S. Beaver St., P.O. Box 5640, Flagstaff, AZ, 86011, USA
2 - Northern Arizona University, Biological Sciences, P.O. Box 5640, Flagstaff, AZ, 86011, USA

none specified

Presentation Type: Oral Paper:Papers for Sections
Session: 6
Location: Salon 15/16/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 10:45 AM
Number: 6011
Abstract ID:1323
Candidate for Awards:None

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