| Abstract Detail
Systematics Section / ASPT Hames, Kasey [1], Barber, Janet C. [1], Cialdella, Ana Maria [2], Giussani, Liliana Monica [2]. Phylogenetic Relationships of the Genus Piptochaetium: Evidence from ITS Data. Piptochaetium (Poaceae, Pooideae, Stipeae) is a New World perennial grass genus distributed primarily in temperate South America. The genus is composed of approximately 36 species, 2 subspecies and 2 varieties and is characterized by the presence of a longitudinally-grooved palea that is longer than the lemma and protrudes from the lemma apex; lemma margins are involuted and fitted into the palea groove. A morphological phylogeny has recently been published for the entire genus but molecular work has focused on only a few species and their relationship with other grasses within Poaceae. We are working in conjunction with researchers at the Instituto de Botánica Darwinion in Argentina to develop a hypothesis of relationships among Piptochaetium taxa using molecular data. Our lab is sequencing the internal transcribed spacer (ITS) region of the nuclear ribosomal repeat for Piptochaetium plus appropriate outgroup taxa from the genera Nassella and Jarava. Our Argentinan colleagues will reconstruct relationships using chloroplast data. These phylogenies will be used to test morphological hypotheses of relationships.
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1 - Saint Louis University, Department of Biology, 3507 Laclede Avenue, St Louis, Missouri, 63103-2010, USA
2 - Instituto De Botánica Darwinion, Casilla De Correo 22, San Isidro, Buenos Aires, B1642HYD, Argentina
Keywords:
Phylogenetics
Poaceae
Piptochaetium
ITS.
Presentation Type: Poster
Session: 33-85
Location: Salon C, D & E - Gov Ballroom/Hilton
Date: Tuesday, August 16th, 2005
Time: 12:30 PM
Abstract ID:55 |
