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Towards a Species Level Phylogeny of Symphoricarpos (Caprifoliaceae), Based on Nuclear and Chloroplast DNA

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Although recent molecular phylogenetic studies of Dipsacales support a Caprifolieae clade containing Leycesteria, Triosteum, Symphoricarpos, and Lonicera, relationships among these taxa remain uncertain. Likewise, phylogenetic studies sampling more than just a handful of the species of Symphoricarpos has not been pursued. Here I present evidence based on both chloroplast and nuclear DNA to help resolve the phylogenetic relationships of both the Caprifolieae, as well as Symphoricarpos. For nuclear markers, I sequenced the ITS region in addition to the geranylgeranyl reductase (Chlp) gene, which appears to be present in only a single copy in Caprifolieae. Although Chlp does not provide a great deal of resolution by itself, it does provide additional phylogenetically informative characters. From these data, there appears to be strong congruence between both the genomes with respect to the relationships within Symphoricarpos, however, statistical support for any given hypothesis is weak. These additional data do not further support or clarify our understanding about the relationships among members of the Caprifolieae, showing conflicting results between the chloroplast and nuclear genomes.
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Keywords: CAPRIFOLIEAE; GERANYLGERANYL REDUCTASE; PHYLOGENETICS; SINGLE-COPY NUCLEAR GENES; SYMPHORICARPOS

Document Type: Regular Paper

Publication date: 2010-04-01

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