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Abstract Detail

Systematics Section / ASPT

Calviño, Carolina I. [1], Downie, Stephen R. [2].

Phylogenetic relationships within Apiaceae subfamily Saniculoideae based on cpDNA trnQ-trnK 5’exon sequences.

Phylogenetic relationships within subfamily Saniculoideae were estimated using cpDNA trnQ-trnK 5’exon sequences to clarify the circumscription of the subfamily and to assess the monophyly of its constituent genera. Ninety-one accessions of Apiaceae were examined, including the genera Steganotaenia, Polemanniopsis, and Lichtensteinia which have been traditionally treated in subfamily Apioideae but determined in recent studies to be more closely related to or included within subfamily Saniculoideae. The trnQ-trnK region includes two intergenic spacers heretofore underutilized in molecular systematic studies and the rps16 intron. Analyses of these loci permitted an assessment of the relative utility of these noncoding regions (including the use of indel characters) for phylogenetic study at different hierarchical levels. The region presents a large number of phylogenetically informative indels that, when analyzed by themselves, yield trees of great resolution and high levels of overall branch support. When used with nucleotide substitution data, the inclusion of indels in phylogenetic analyses of both combined and partitioned data sets improves resolution of relationships, increases branch support values, and decreases levels of overall homoplasy. Moreover, the region is useful at a variety of hierchical levels within Apiaceae, given the large number of parsimony informative characters obtained, as well as adequate levels of sequence divergence observed even among congeners. Intergeneric relationships derived from MP, Bayesian, and ML analyses, as well as from MP analysis of indel data alone, are fully resolved, consistent with one another and well supported. We confirm the expansion of subfamily Saniculoideae to include Steganotaenia and Polemanniopsis (as a new tribe) but not Lichtensteinia. The latter should be maintained within subfamily Apioideae. Sister group to the new tribe is tribe Saniculeae, redefined to include the genera Actinolema, Alepidea, Arctopus, Astrantia, Eryngium, Petagnaea, and Sanicula. With the synonymization of Hacquetia into Sanicula, all genera are monophyletic.

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1 - Instituto de Botanica Darwinion, Labarden 200, CC22, San Isidro, Buenos Aires, B1642HYD, Argentina
2 - University of Illinois Urbana, Department of Plant Biology, 265 Morrill Hall, 505 South Goodwin Avenue, Urbana, Illinois, 61801-3707, USA

cpDNA trnQ-trnK 5'exon

Presentation Type: Poster:Posters for Sections
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P59034
Abstract ID:1332

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