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Abstract Detail


Systematics Section

Attigala, Lakshmi [1], Triplett, Jimmy [2], Clark, Lynn [3].

A new major lineage of the Arundinarieae (Poaceae: Bambusoideae) based on a multi-locus plastid phylogeny.

The temperate woody bamboo tribe Arundinarieae is a morphologically diverse and taxonomically complex group within the Bambusoideae (Poaceae). Arundinarieae includes over 500 species and is broadly distributed in temperate or subtemperate regions in North America and Eastern Asia and at higher elevations in Africa, Madagascar, Sri Lanka, India and the Philippines. Monophyly of the temperate clade is well supported in many previous molecular studies. The most recent phylogenetic analyses based on chloroplast DNA reveal ten major lineages, but without resolution among them. This study included all the native Sri Lankan Arundinaria species along with representatives from all ten main lineages of the temperate bamboo clade to reconstruct the phylogeny based on four chloroplast DNA noncoding regions (rpoB-trnC, rps16-trnQ, trnD/T, andtrnT/L intergenic spacers). Our objectives were to place the Sri Lankan Arundinaria species in the correct genus or genera and understand the inter-relationships of the major clades within Arundinarieae. Phylogenetic analyses fully supported the monophyly of the Sri Lankan Arundinaria species, but failed to resolve the position of this clade relative to the other ten clades. These species therefore represent the eleventh lineage of the temperate bamboo clade. We discuss these results and propose the recognition of a new genus to accommodate the Sri Lankan clade. Key morphological characters including rhizome morphology, culm leaves, vegetative branching pattern, and synflorescence structure are compared among the Sri Lankan clade and Arundinaria, Yushania, and Thamnocalamus, the genera in which the Sri Lankan species have been classified.

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1 - Iowa State University, Department of Ecology Evolution and Organismal Biology, 253 Bessey Hall, Ames, IA, 50011-1020, USA
2 - Jacksonville State University, 700 Pelham Road North, Jacksonville, AL, 36265, USA
3 - Iowa State University, Department Of Ecology, Evolution, And Organismal Biology, 253 Bessey Hall, Ames, IA, 50011-1020, USA

Keywords:
Arundinarieae
Sri Lankan Arundinaria
Plastid DNA
Phylogenetic analysis.

Presentation Type: Oral Paper:Papers for Sections
Session: 44
Location: Lindell A/Chase Park Plaza
Date: Wednesday, July 13th, 2011
Time: 9:15 AM
Number: 44004
Abstract ID:210


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