Systematics Section / ASPT
Soza, Valerie , Olmstead, Richard .
Molecular Phylogenetics of Galium and Bedstraw Breeding System Evolution within Rubiaceae (Coffee Family).
Galium (bedstraw) is a member of tribe Rubieae within Rubiaceae (coffee family). Rubieae are characterized as herbs with whorls of leaves and leaf-like stipules, and comprised of about 675 species distributed worldwide. Approximately 14 genera are included within Rubieae and previous molecular phylogenetic analyses within the tribe support the monophyly of Rubieae, but indicate paraphyly of Galium. Relationships within Galium and its related genera remain poorly understood, and require more extensive sampling and use of additional regions of DNA to elucidate interspecific relationships. Several non-coding regions of chloroplast DNA are being used from taxa within the tribe to develop a framework molecular phylogeny for Galium and related genera and for finer taxonomic scales within Galium. Our results confirm previous analyses showing Galium as paraphyletic, with some members forming two clades with members of the genus Asperula, and other members of Galium forming a clade with three other genera, Cruciata, Relbunium and Valantia. Our results indicate a well-supported clade of taxa from four sections: Baccogalium, Lophogalium, Platygalium and Relbunium. A more fine scale phylogeny of this clade will be used to examine breeding system evolution among species exhibiting hermaphroditism, dioecy, and mixed breeding systems. Within the fleshy-fruited group Baccogalium, polygamous species appear to represent a breakdown of dioecy rather than a transitional state from hermaphroditism towards dioecy.
Log in to add this item to your schedule
1 - University of Washington, Department of Biology, Box 355325, Seattle, WA, 98195-5325, USA
2 - University of Washington, Department of Biology, Box 355325, Seattle, Washington, 98195-5325, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Stevens 2/Hilton
Date: Tuesday, July 10th, 2007
Time: 4:00 PM