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Systematics Section / ASPT

Ickert-Bond, Stefanie, M. [1], Mason-Gamer, Roberta [2], Wen, Jun [1].

Phylogeny of Altingiaceae: evidence from combined analysis of five non-coding chloroplast regions and nuclear GBSSI (waxy).

The Altingiaceae are a well-defined group of ca. 15 species that show a classic Asian/ North American disjunct intercontinental biogeographic distribution. To resolve species-level relationships and biogeographic diversification we have generated nuclear sequence data from the GBBSI (waxy) gene, chloroplast data from the trnL-trnF intergenic spacer (IGS), the psaA-ycf3 IGS, the rps16 intron, the trnS-trnG IGS, and the trnG intron. Parsimony and Bayesian analyses resulted in congruent relationships among several lineages. Most notably, (1) Liquidambar is paraphyletic; (2) L. acalycina and Altingia gracilipes constitute a separate Asian tropical to subtropical lineage within Altingiaceae; (3) Semiliquidambar nests within the L. formosana lineage; and (4) the eastern North American L. styraciflua groups with the western Asian L. orientalis, but is highly distinct from other lineages. Our morphological cladistic analysis supports the monophyly of Liquidambar with Altingia as its sister. The discordance between the morphological and the molecular data sets may be due to different rates of morphological evolution as well as convergence in these taxa.

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1 - Field Museum of Natural Hististory, Department of Botany, 1400 South Lake Shore Drive, Roosevelt Rd At Lake Shore, Chicago, Illinois, 60605-2496, USA
2 - University of Illinois Chicago, Department of Biological Sciences, M/C 066, 845 W Taylor Street, Chicago, Illinois, 60607, USA

GBSSI (waxy)

Presentation Type: Oral Paper
Session: 12-9
Location: 410/Hilton
Date: Monday, August 15th, 2005
Time: 2:45 PM
Abstract ID:218

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