Systematics Section / ASPT
Prince, Linda , Kress, W. John .
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
nuclear ribosomal DNA
Presentation Type: Poster
Location: Special Event Center (Cliff Lodge)
Date: Tuesday, August 3rd, 2004
Time: 12:30 PM