Abstract Detail

Systematics Section/ASPT

Stull, Gregory W. [1], Refulio-Rodriguez, Nancy F.  [2], OLMSTEAD , RICHARD G [3], Duno de Stefano, Rodrigo  [4], Soltis, Douglas E. [1], SOLTIS, PAMELA S. [1].

Resolving enigmatic basal lamiid relationships with a plastome-scale data set.

The Lamiidae are a clade of asterids including ca. 40,000 species or ca. 15 percent of angiosperm species diversity. Despite numerous phylogenetic studies of this clade, some familial and ordinal relationships remain poorly resolved, in particular towards the base of the lamiid tree. A number of enigmatic, species-poor groups—i.e., Garryales, Icacinaceae s.s., generic segregates of Icacinaceae s.l., Metteniusa, and Oncotheca—appear to represent a basal grade leading to the core lamiids—i.e., Boraginales, Gentianales, Lamiales, Solanales, and Vahliaceae—but the configuration of this grade has eluded resolution in all previous studies. Progress has recently been made in resolving relationships among the core lamiids, which comprise the vast majority of lamiid species diversity. However, the position of Vahliaceae remains uncertain, and the sister relationship of Boraginales and Lamiales (recovered in several recent studies) remains poorly supported.  To improve our understanding of lamiid phylogeny, particularly toward the base of the tree, we used several sequencing strategies (genome-skimming and hyb-seq, paired with the Illumina sequencing platform) to generate 52 plastid genomes representing 39 of the 40 basal lamiid genera as well as several core lamiid groups (e.g., Vahlia and several genera of Boraginaceae). These data were combined with previously generated asterid plastid genomes, including multiple representatives of Boraginales, Gentianales, Lamiales, and Solanales, as well as the 10-gene/129-taxon lamiid data set of Refulio-Rodriguez and Olmstead (2014), for phylogenetic analyses based on up to 83 plastid genes. The results of this study significantly improve our understanding of enigmatic basal lamiid relationships, providing an improved phylogenetic framework for understanding character evolution within the asterids and for establishing a more stable ordinal and familial classification system for the basal lamiid taxa.

1 - University of Florida, Florida Museum of Natural History, PO Box 117800, Gainesville, FL, 32611, USA
2 - University of Washington, Department of Biology, Seattle, WA, 98195 , USA
3 - University Of Washington, Department Of Biology, CAMPUS BOX 355325, SEATTLE, WA, 98195-5325, USA
4 - Centro de Investigación Científica de Yucatán A.C., Herbarium CICY, Mérida, Yucatán, México

Keywords:
Icacinaceae
Lamiidae
Metteniusaceae
Oncothecaceae
phylogenomics
plastome.

Presentation Type: Oral Paper:Papers for Sections
Session: 17
Location: Payette/Boise Centre
Date: Tuesday, July 29th, 2014
Time: 9:15 AM
Number: 17006
Abstract ID:387
Candidate for Awards:George R. Cooley Award