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A model of bulb evolution in the eudicot genus Oxalis (Oxalidaceae)

dc.contributor.authorOberlander K.C.
dc.contributor.authorEmshwiller E.
dc.contributor.authorBellstedt D.U.
dc.contributor.authorDreyer L.L.
dc.date.accessioned2011-05-15T15:57:20Z
dc.date.available2011-05-15T15:57:20Z
dc.date.issued2009
dc.identifier.citationMolecular Phylogenetics and Evolution
dc.identifier.citation51
dc.identifier.citation1
dc.identifier.issn10557903
dc.identifier.other10.1016/j.ympev.2008.11.022
dc.identifier.urihttp://hdl.handle.net/10019.1/10340
dc.description.abstractThe origins and monophyly of the bulbous habit in the eudicot genus Oxalis are uncertain, but key character state transitions in the evolution of true bulbs are currently thought to be reflected in extant pseudobulbous and other geophytic taxa. We test the relationships between the two major groups of bulbous Oxalis taxa, namely the southern African lineage which is centered in the speciose Cape Floristic Region (CFR), and the New World section Ionoxalis, by including the rhizomatous geophyte Oxalis acetosella, the caudiciform stem succulent Oxalis articulata, and the rhizomiform pseudobulbous Oxalis triangularis, in combined phylogenetic analyses of nrITS and trnL-F sequence data. We optimize several key bulbous characters in ancestral state reconstructions on produced phylogenies. Results of our analyses indicate that the evolution of bulbous characters in the genus is more complex than previously thought. Although the two major bulb types are homologous, the rhizomiform pseudobulbous habit arises from within true bulbs, and in most reconstructions the caudiciform stem succulent O. articulata is inferred to have secondarily lost several distinctive bulbous characters. O. acetosella is not as closely related to the bulbous lineage as previously thought. More sampling from other key taxa are needed before the order in which key bulbous characters were acquired can be verified. We discuss these results in terms of the taxonomic and ecological implications for the CFR Oxalis taxa. © 2008 Elsevier Inc. All rights reserved.
dc.subjectAfrica
dc.subjectangiosperm
dc.subjectarticle
dc.subjectBayes theorem
dc.subjectevolution
dc.subjectgenetics
dc.subjectphylogeny
dc.subjectplant root
dc.subjectstatistical model
dc.subjectAfrica, Southern
dc.subjectAngiosperms
dc.subjectBayes Theorem
dc.subjectEvolution
dc.subjectLikelihood Functions
dc.subjectPhylogeny
dc.subjectPlant Roots
dc.subjectOxalidaceae
dc.subjectOxalis
dc.subjectOxalis acetosella
dc.subjectOxalis articulata
dc.subjectOxalis incarnata
dc.subjectOxalis pes-caprae
dc.subjectOxalis triangularis
dc.titleA model of bulb evolution in the eudicot genus Oxalis (Oxalidaceae)
dc.typeArticle
dc.description.versionArticle


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