Systematics Section / ASPT
Clark, Lynn G. , Triplett, J.K. .
Phylogeny of the Bambusoideae (Poaceae): an update.
ALTHOUGH available plastid nucleotide sequence data(primarily ndhF and the rpl16 intron) strongly support monophyly of the true bamboos (Poaceae: Bambusoideae), these data sets do not provide robust resolution among the major lineages (Olyreae or herbaceous bamboos, the north temperate woody bamboos, and the tropical woody bamboos), which typically form a trichotomy or a tetrachotomy. When sequence data are combined with structural data, the herbaceous bamboos (Olyreae) are resolved as sister to the woody bamboos (Bambuseae). We generated sequences of the plastid trnD-T spacer for a subsample of 21 bamboo species plus two outgroup species to test its utility for phylogenetic reconstruction in this group and to examine the effects on branch support of adding another sequence data set to the existing ndhF and rpl16 intron data sets for bamboos. The trnD-T only analysis recovered a topology consistent with those produced by the other data sets, but with somewhat higher levels of branch support and greater resolution. When combined with the other two sequence data sets, a completely resolved tree was obtained with greatly increased levels of support even along the backbone. The north temperate woody bamboo clade appeared as the earliest-diverging lineage within the Bambusoideae, with the Olyreae sister to the tropical woody bamboos. The Bamboo Phylogeny Group is now actively engaged in a collaborative analysis to greatly increase sampling density and to add two more plastid markers in order to test these results and obtain a well supported phylogeny of the Bambusoideae upon which a stable generic classification can be based.[c.e.:srb]
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1 - Iowa State University, Department of Ecology, Evolution & Organismal Biology, 253 Bessey Hall, Ames, Iowa, 50011-1020, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, August 2nd, 2006
Time: 3:30 PM