Trnl-f and rp116 sequence data and dense taxon sampling reveal monophyly of unilocular anthered gomphrenoideae (amaranthaceae) and an improved picture of their internal relationships
Por:
Del-Pino I.S., Borsch T., Motley T.J.
Publicada:
1 ene 2009
Resumen:
The Amaranthaceae-Chenopodiaceae alliance has been the focus of several phylogenetic studies, but major questions concerning the internal relationships of Amaranthaceae still remain unanswered. This study aims to test the monophyly of the subfamily Gomphrenoideae and to examine the generic relationships within this group. Parsimony and Bayesian analyses of trnL-F and rp116 show that the subfamily Gomphrenoideae is monophyletic. The clade of Gomphrenoideae represents a large and diverse radiation of the Amaranthaceae in the New World. Unilocular anthers are a morphological synapomorphy for Gomphrenoideae that was derived from bilocular anthers. Three major clades are resolved: the Gomphrenoids, the Alternantheroids, and the Iresinoids, which are largely supported by pollen morphology. The Iresinoid clade is sister to Alternantheroids plus Gomphrenoids, rendering metareticulate pollen as the synapomorphy for the latter two clades. Tribes and subtribes delimited by androecium and inflorescence characters are poly- or paraphyletic. Several genera are monophyletic including the large genus Alternanthera , whereas Gomphrena is polyphyletic. Irenella and Woehleria are resolved within Iresine whereas Blutaparon and Lithophila fall within the polyphyletic Gomphrena . The trnL-F and rp116 sequence data are the most variable chloroplast regions examined to date for the family and are highly effective in resolving relationships in Amaranthaceae. © Copyright 2009.
Filiaciones:
Lewis B. and Dorothy Cullman Program for Molecular Systematics Studies, New York Botanical Garden, 200 th St. and Southern Blvd., Bronx, NY 10458-5126, United States
Centro de Investigación Científica de Yucatán, A. C. Calle 43 No 130 Col. Chuburná de Hidalgo, CP. 97200, Mérida, Yucatán, Mexico
Nees-Institut für Biodiversität der Pflanzen, Friedrich Wilhelms-Universität Bonn, Meckenheimer Allee 170, 53115 Bonn, Germany
Botanischer Garten und Botanisches Museum Berlin-Dahlem und Institut für Biologie, Freie Universität Berlin, Königin Luise-Straße 6-8, 14195 Berlin, Germany
Old Dominion University, Department of Biological Sciences, 110 Mills Godwin Building/45th St., Norfolk, VA 23529-0266, United States
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