Viana, Pedro L. , Tyrrell, Christopher D. , Triplett, Jimmy K. , Clark, Lynn G. .
Phylogeny of the Arthrostylidiinae: the Glaziophyton clade (Poaceae: Bambusoideae: Bambuseae).
Arthrostylidiinae is a neotropical woody bamboo subtribe comprising 14 genera (one currently being described) and about 165 described species. Monophyly of the Arthrostylidiinae is strongly supported by both molecular and morphological data, and its position as sister to the Guaduinae, another lineage of neotropical woody bamboos, is strongly supported by molecular data and the presence of refractive papillae in both subtribes. We analyzed 52 taxa (46 representing 12 of 14 Arthrostylidiinae genera, 5 representing the 5 genera of Guaduinae, and an outgroup taxon) using sequence data from both coding (ndhF, 3’ half) and non-coding (trnD-trnT, trnC-rpoB, rps16-trnQ, trnT-trnL, rpl16 intron) chloroplast DNA regions. We recovered the same five clades as seen in our previous analysis but with stronger support, and additionally recovered support for the position of the Glaziophyton clade as sister to the remainder of the subtribe. Additional results include confirmation of the polyphyly of both Aulonemia and Arthrostylidium. Testing of alternate hypotheses suggests that the grouping of two species of Aulonemia with Glaziophyton is not due to long-branch attraction. All three of the species of the Glaziophyton clade share tessellate foliage leaves, a character state not found elsewhere in the subtribe, and both of the Aulonemia species are anomalous in other ways relative to the core of Aulonemia. We discuss the implications of these findings and propose the recognition of another new genus to accommodate at least one of the Aulonemia species in the Glaziophyton clade.
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1 - Universidade Federal de Minas Gerais, Laboratório de Sistemática Vegetal, Belo Horizonte, MG, Brazil
2 - University of New Brunswick , Dept. of Biology, Canadian Rivers Institute, P.O. Box 4400, Fredericton, NB, E3B 2A3 , Canada
3 - Smithsonian Institution, Dept. of Botany, Mrc-166, National Museum of Natural History, Washington, DC, 20013-7012, USA
4 - 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: 556B/Convention Center
Date: Tuesday, August 3rd, 2010
Time: 8:15 AM