Systematics Section / ASPT
Triplett, J.K. , Clark, Lynn G. .
Unexpected relationships, morphological homoplasy, and intergeneric hybridization in the phylogeny of north temperate woody bamboos (Poaceae: Bambusoideae).
The morphologically diverse North Temperate (NT) clade of woody bamboos (c. 19-31 genera, 502 species) has worldwide ecological and economic importance but its evolutionary history has largely resisted reconstruction, resulting in an unstable taxonomy and controversial generic boundaries. Recent analyses using an expanded survey of 5 non-coding plus 1 coding cpDNA sequence data sets recover a partially resolved phylogeny that challenges important assumptions of current morphology-based classifications, while providing robust support for the monophyly of several novel assemblages. Moreover, morphological comparisons in the context of the new molecular phylogeny indicate possible hybridization events between phylogenetically remote species, despite temporal isolation via long flowering cycles (10-120 years). Current work focuses on the North American genus Arundinaria and allied taxa in East Asia (Pleioblastus, Pseudosasa, Sasa) to resolve generic boundaries and species-level relationships while testing hypotheses on the putative hybrid origins of Semiarundinaria and Hibanobambusa. Amplified fragment length polymorphisms (AFLPs) are being used to add species-level resolution and to examine patterns of genetic distinctiveness in order to reconcile plastid sequence- and morphology-based phylogeny estimates. Morphological characters used in the traditional taxonomy of these temperate forest grasses, including inflorescence and branch architecture, will be discussed in light of the new phylogenetic evidence.
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Bamboo Phylogeny Group
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
Location: Continental A/Hilton
Date: Tuesday, July 10th, 2007
Time: 8:30 AM