Abstract Detail

Systematics Section / ASPT

Prince, Linda [1], Kress, W. John [2].

Rooting the Zingiberales Phylogenetic Tree: Evidence from Three Genomes.

Phylogenetic relationships among and within the terminal Zingiberales clade of the “ginger” families (Cannaceae, Costaceae, Marantaceae, and Zingiberaceae) are well understood with strong statistical support from cladistic analyses of anatomical, morphological, and molecular data. However, relationships among the earlier diverged “banana” families (Heliconiaceae, Lowiaceae, Musaceae, and Strelitziaceae) receive low statistical support with the exception of a Lowiaceae + Strelitziaceae clade. The relationship between Strelitziaceae and Lowiaceae has recently been challenged by the addition of a non-coding plastid data set. We used a broad range of coding and non-coding regions from three genomes (nuclear: 18S, 5.8S, and 26S; mitochondrial: atp1, cox1, and nad1; plastid: matK, ndhF, rbcL, rps16 intron, trnL-F intergenic spacer, and trnE-T intergenic spacer) to address relationships within the order under both parsimony and likelihood criteria. In general, the non-coding regions required exclusion of large amounts of the data set due to alignment ambiguity. Some of the individual data sets resolve a monophyletic Zingiberales and monophyletic families, but fail to resolve relationships among some families. The lack of resolution indicates that some of the markers utilized may be evolving too slowly or too quickly for the questions posed. Combined data analyses result in a single tree that places Musaceae basal in the order, but with weak statistical support. The addition of new data from all three genomes with low statistical provides further evidence for a rapid diversification of the Zingiberales, especially the “banana” families.

1 - Rancho Santa Ana Botanical Garden, 1500 North College Avenue, Claremont, California, 91711-3157, USA
2 - Smithsonian Institution, Department of Botany, MRC166, National Museum of Natural History, P.O. Box 37012, Washington, DC, 20013-7012, USA

Keywords:
likelihood
mitochondrial DNA
nuclear ribosomal DNA
parsimony
phylogenetic inference
plastid DNA
Zingiberales.

Presentation Type: Poster
Session: 32-88
Location: Special Event Center (Cliff Lodge)
Date: Tuesday, August 3rd, 2004
Time: 12:30 PM
Abstract ID:529