Sanchez, Adriana , Kron, Kathleen A. .
Phylogenetic relationships of Triplaris Loefl. ex. L. and Ruprechtia C. A. Mey. with emphasis on Triplaris (Polygonaceae) and its association with Pseudomyrmex ants.
Triplaris Loefl. ex L. and Ruprechtia C. A. Mey. (Polygonaceae) form a strongly supported clade in the subfamily Eriogonoideae. However their circumscription, based on morphological characters, has been problematic through history and many of the characters are not exempt of exceptions. In previous phylogenetic analyses including seven species of Ruprechtia and five of Triplaris, it was shown that Ruprechtia triflora Griseb. is sister to a clade of Ruprechtia + Triplaris, rendering Ruprechtia paraphyletic. In this present study, 18 species of Ruprechtia and 10 of Triplaris are included, using four chloroplast genes (matK, ndhF, ndhC-trnV, rps16-trnK) and ITS. A new delimitation for these genera is proposed. The species circumscription in Triplaris has also been problematic, resulting in many identification errors in herbaria. In this study the intraspecific relationships of 12 species and 35 accessions are examined, with two chloroplast genes (rps16-trnK, psbA-trnH), one nuclear region and ITS. The monophyly of the species and its ecological implications regarding the association with Pseudomyrmex Lund. (Pseudomyrmecinae) ants will be discussed.
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1 - Wake Forest University, Department of Biology, PO Box 7325, 226 Winston Hall, Winston-Salem, North Carolina, 27109-7325, USA
nuclear and chloroplast DNA analysis
Presentation Type: Oral Paper:Papers for Sections
Location: 554/Convention Center
Date: Wednesday, August 4th, 2010
Time: 1:15 PM