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Systematics Section / ASPT

Drummond, Christopher [1].

Phylogeny of Lupinus (Leguminosae) based on non-coding cpDNA.

Lupinus comprises a large genus of 150+ species, primarily from North America, South America, and the Mediterranean region of Africa and Eurasia. Relationships in Lupinus have long been uncertain, partly due to labile and often subtle morphological differences between species, and may be further confounded by gene flow and incomplete lineage sorting among recently diverged taxa. Previous studies of Lupinus using nuclear ribosomal spacers (ITS1+2) and coding cpDNA (rbcL) have failed to provide substantial resolution within the genus, suggesting that faster, more variable markers will be required to elucidate relationships between and within species. In order to establish a phylogenetic framework for testing hypotheses about the evolution of floral display phenotypes, mating systems, and phylogeographic relationships, non-coding chloroplast DNA sequence data were collected from two intergenic spacers (trnS-trnG, trnT-trnL) and an intron (trnL intron) to estimate the phylogeny of Lupinus. 92 specimens of Lupinus were sampled from across the genus, in addition to five outgroup genera (Argyrolobium, Chamaecytisus, Genista, Laburnum, Spartium) in the Papilionoideae. Data from non-coding cpDNA provide strong support for relationships among multiple clades in a large assemblage of New World species, but yield less resolution among basal lineages of Lupinus.

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1 - Georgetown University, Department of Biology, 406 Reiss Sciences Bldg, 37th & O St NW, Washington, DC, 20057

trnL intron.

Presentation Type: Oral Paper
Session: 44-9
Location: Salon G - Austin Grand Ballroom/Hilton
Date: Wednesday, August 17th, 2005
Time: 10:30 AM
Abstract ID:292

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