Systematics Section / ASPT
Wahlert, G. A. , Parker, V. Thomas , Vasey, Michael C. .
A Phylogeny of Arctostaphylos (Arbutoideae, Ericaceae) Inferred from nrITS Sequence Data.
A phylogeny of Arctostaphylos (Arbutoideae, Ericaceae) was estimated using the nuclear ribosomal Internal Transcribed Spacer (ITS) sequence data for 85 taxa and 16 accessions of widespread taxa. Forty-five taxa had identical ITS sequences and 17 taxa had polymorphic ITS nucleotide positions. Phylogenetic analyses resulted in two-clade topologies that were largely congruent with other studies in the genus, except that seven North American accessions of A. uva-ursi were consistently resolved as monophyletic. In four taxa, patterns of nucleotide additivity in the ITS region were suggestive of interspecific hybrid origin. Four chloroplast intergenic spacers (atpB-rbcL, trnL-trnF, trnG-trnS, and trnH-psbA) and the trnL intron were sequenced for nine geographically distant and morphologically divergent species. The combined chloroplast data set was insufficiently variable to provide much phylogenetic information or to confirm the maternal parent in putative hybrids.
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1 - Ohio University, Department of Environmental & Plant Biology, Porter Hall, Richland Avenue, Athens, Ohio, 45701-2979, USA
2 - San Francisco State University, Department of Biology, 1600 Holloway Avenue, San Francisco, California, 94132
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Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, August 1st, 2006
Time: 4:30 PM