Floral development of the Ornithocephalus clade (Oncidiinae, Orchidaceae): The origin of the tabula infrastigmatica, gynostemium appendices and labellar callus

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dc.contributor.authorRoyer, Carla A
dc.contributor.authorToscano De Brito, A. L. V
dc.contributor.authorStützel, Thomas
dc.contributor.authorSmidt, Eric C
dc.contributor.authorNunes, Elaine L. P
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionMarie Selby Botanical Gardens
dc.contributor.institutionRuhr-Universität
dc.contributor.institutionUniversidade Federal do Paraná (UFPR)
dc.date.accessioned2021-06-25T10:29:32Z
dc.date.available2021-06-25T10:29:32Z
dc.date.issued2021-04-01
dc.description.abstractThe Ornithocephalus clade comprises small epiphytes distributed in 12 genera and c. 120 species. Their flowers have complex structures, the homologies of which are difficult to interpret. Through ontogenetic studies, we identified the origins of the tabula infrastigmatica, floral appendages located in the gynostemium and the labellar callus. Using a scanning electron microscope (SEM), we analysed flowers at various developmental stages from representatives of three genera: Ornithocephalus (two species), Phymatidium (two species) and Zygostates (three species). The tabula infrastigmatica of Phymatidium results from the fusion of the lateral carpels and staminodes, with different degrees of synorganization across species and can be considered a plesiomorphic characteristic within the clade. Contradicting hypotheses of a staminodial origin, the auricles present in this genus derive from the gynostemium. In Zygostates, the lateral appendices derive from staminodes and can show different development degrees, whereas in Ornithocephaus that character has been lost. We corroborate the view that the labellum is a single organ derived from the median petal and the labellar callus is derived from it.en
dc.description.affiliationPrograma de Pós-Graduação em Ciências Biológicas (Biologia Vegetal) Instituto de Biociências
dc.description.affiliationMarie Selby Botanical Gardens, 811 South Palm Avenue
dc.description.affiliationEvolution and Biodiversity of Plants Faculty for Biology and Biotechnology Ruhr-Universität
dc.description.affiliationDepartamento de Botânica Universidade Federal Do Paraná
dc.format.extent636-649
dc.identifierhttp://dx.doi.org/10.1093/botlinnean/boaa089
dc.identifier.citationBotanical Journal of the Linnean Society, v. 195, n. 4, p. 636-649, 2021.
dc.identifier.doi10.1093/botlinnean/boaa089
dc.identifier.issn1095-8339
dc.identifier.issn0024-4074
dc.identifier.scopus2-s2.0-85105153334
dc.identifier.urihttp://hdl.handle.net/11449/206284
dc.language.isoeng
dc.relation.ispartofBotanical Journal of the Linnean Society
dc.sourceScopus
dc.subjectfloral ontogeny
dc.subjectgynostemium
dc.subjecthomology
dc.subjectlateral carpels
dc.subjectstaminodes
dc.titleFloral development of the Ornithocephalus clade (Oncidiinae, Orchidaceae): The origin of the tabula infrastigmatica, gynostemium appendices and labellar callusen
dc.typeArtigo

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