Schuster, Tanja , Reveal , James , Kron, Kathleen .
Evolutionary relationships within tribe Polygoneae Rchb. (Polygonaceae).
Several genera included in tribe Polygoneae are investigated using a molecular framework. These genera include Atraphaxis, Duma, Fallopia, Muehlenbeckia, Polygonella, Polygonum, Oxygonum and Reynoutria. Morphological data have been used to recognize three sections in Polygonum (Duravia, Polygonum and Pseudomollia) and to support the inclusion of Polygonella within Polygonum based on similarities to members of sect. Duravia. Oxygonum has been considered a member of Polygoneae based on morphology but it has not been included in any molecular analysis to date. The evolutionary relationships among genera of Polygoneae were addressed with Maximum Likelihood and Maximum Parsimony methods using sequence data from one nuclear (nrITS) and three chloroplast (matK, ndhF and trnL-trnF) markers. The results of this study indicate that tribe Polygoneae is composed of three clades with Knorringia sister to all other taxa within Polygoneae. A second clade is formed by Reynoutria and Fallopia + Muehlenbeckia and the third by their sister clade comprising Atraphaxis, Duma and Polygonum (including Polygonella). The currently accepted sections within Polygonum were also recovered with these molecular data and show that Polygonum sect. Duravia including subsect. Polygonella is sister to a clade formed by the sects. Polygonum and Pseudomollia. Within the strongly supported subsect. Polygonella, Polygonella robusta is sister to all other species sampled. Finally, Oxygonum was shown not to be included in Polygoneae and branches between Persicarieae and Fagopyreae, but with weak bootstrap support.
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1 - Wake Forest University, Department of Biology, Reynolda Station, P.O. Box 7325, Winston-Salem, NC, 27109, USA
2 - L.H. Bailey Hortorium, Department of Plant Biology, 412 Mann Building, Cornell University, Ithaca, NY, 14853, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell B/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 1:30 PM