Xi, Zhenxiang , Ruhfel, Brad R , Wurdack, Kenneth , Amorim, Andre , Davis, III, Charles C. .
Complete plastid genomes do not resolve deep relationships in Malpighiales.
Several recent studies have demonstrated the promise of using complete plastid genomes to resolve the most problematic clades in the plant Tree of Life. One of the largest and most poorly resolved clades of angiosperms is Malpighiales, which include more than 16,000 species that are highly diversified in their morphology and ecologies. Despite our best efforts to resolve phylogenetic relationships within this clade, its major subclades are largely unresolved. Here, we utilize 45 plastid genomes representing all major lineages of Malpighiales to resolve relationships within the order. Although we detected several new clades deeper in the tree, many of which correspond to older classifications based on morphology, this lack of resolution remains. This holds despite our efforts to increase character and taxon sampling, i.e., using a simultaneous analysis of 83 plastid genes plus additional mitochondrial and nuclear gene regions (totaling ~80,000 base pairs for 53 taxa). These results reinforce previous assertions that the early diversification of Malpighiales was ancient and rapid, perhaps coinciding with the Cretaceous origin of modern tropical rain forests. Finally, they also suggest that complete genomes may not be able to resolve the most problematic nodes in the Tree of Life.
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1 - Harvard University, Department of Organismic and Evolutionary Biology, 22 Divinity Ave, Cambridge, MA, 02138, USA
2 - Smithsonian Institution, Botany Department, PO Box 37012, NMNH, MRC-166, Washington, DC, 20013-7012, USA
3 - Universidade Estadual de Santa Cruz, Departamento de Ciências Biológicas, Ilhéus, Bahia, 45600-000, Brazil
Presentation Type: Oral Paper:Papers for Sections
Location: Ballroom B/Convention Center
Date: Monday, August 2nd, 2010
Time: 1:15 PM