Artigos
URI permanente para esta coleçãohttps://locus.ufv.br/handle/123456789/11846
Navegar
3 resultados
Resultados da Pesquisa
Item Anatomia foliar como subsídio à taxonomia de Hippocrateoideae (Celastraceae) no Sudeste do Brasil(Acta Botanica Brasilica, 2005-10) Gomes, Sandra Maria Alvarenga; Silva, Eldo Antônio Monteiro da; Lombardi, Julio Antonio; Azevedo, Aristéa Alves; Vale, Fernando Henrique Aguiar(Anatomia foliar como subsídio à taxonomia de Hippocrateoideae (Celastraceae) no Sudeste do Brasil). A anatomia foliar de treze espécies pertencentes a nove gêneros da subfamília Hippocrateoideae (Celastraceae) foi estudada visando a seleção de caracteres anatômicos para subsidiar a taxonomia dos gêneros e espécies. As espécies estudadas foram: Anthodon decussatum Ruiz & Pav., Cheiloclinium cognatum (Miers) A.C. Sm., Cheiloclinium serratum (Cambess.) A.C. Sm., Cuervea crenulata Mennega, Elachyptera micrantha (Cambess.) A.C. Sm., Hippocratea volubilis L., Peritassa flaviflora A.C. Sm., Peritassa mexiae A.C.Sm., Pristimera nervosa (Miers) A.C. Sm., Salacia crassifolia (Mart. ex Schult.) G. Don, Tontelea fluminensis (Peyr.) A.C. Sm., Tontelea leptophylla A.C. Sm. e Tontelea miersii (Peyr.) A.C. Sm. Os caracteres anatômicos selecionados como diagnósticos para a taxonomia dos diferentes gêneros e espécies são: o tipo de esclereíde presente no pecíolo ou na lâmina foliar, o tipo de estômato, a conformação do sistema vascular do pecíolo, a sinuosidade das paredes anticlinais das células epidérmicas, a presença de hipoderme, a ocorrência de laticíferos, dentre outros.Item Anatomical characteristics as taxonomic tools for the species of Curtia and Hockinia (Saccifolieae–Gentianaceae Juss.)(Plant Systematics and Evolution, 2013-06-25) Dalvi, Valdnéa Casagrande; Meira, Renata Maria Strozi Alves; Francino, Dayana Maria Teodoro; Silva, Luzimar Campos; Azevedo, Aristéa AlvesThe delimitation of species and even support of the genera Curtia and Hockinia, monotypic genus, are still controversial. To define anatomical characteristics that help resolve taxonomic problems, the stem and leaf anatomy of seven species of Curtia and Hockinia montana are described. Some characteristics are found in both genera: leaves with uniseriate epidermis, dorsiventral mesophyll, cells of the palisade parenchyma with invaginations, basal acrodromous venation with an incomplete marginal ultimate venation, presence of colleters and nectaries, stem with small wings and internal phloem. The types of stomata, the midrib vascular bundle, and the type and distribution of nectaries were used to separate the genera. The presence/absence of crystals, the sinuosity of the anticlinal walls of the epidermal cells, the type and distribution of stomata, and the distribution of nectaries distinguish species of Curtia. Our results suggest that these anatomical characteristics are potentially useful for clarifying the taxonomy of Gentianaceae, and that they represent an additional tool for distinguishing genera and identifying species of Curtia, particularly pointing out the need to revise the synonymy between C. patula and C. tenuifolia. We also highlight the first report of leaf nectaries and colleters in the Saccifolieae and the first record of stem nectaries in the Gentianaceae.Item Anatomical interpretations of the taxonomy of Chamaecrista (L.) Moench sect. Absus (Leguminosae–Caesalpinioideae)(Plant Systematics and Evolution, 2015-04-19) Coutinho, Ítalo A. C.; Francino, Dayana M. T.; Dalvi, Valdnéa C.; Azevedo, Aristéa A.; Conceição, Adilva de S.; Meira, Renata M. S. A.Chamaecrista (L.) Moench (Caesalpinioideae–Leguminosae) with 330 species is organized into six sections: Apoucouita, Absus, Grimaldia, Chamaecrista, Caliciopsis and Xerocalyx. Section Absus is the largest section of the Chamaecrista and is organized into four subsections, viz., subsect. Adenophyllum, subsect. Baseophyllum, subsect. Otophyllum and subsect. Absus. This section is not monophyletic and has a complex taxonomy. This study aims to anatomically characterize 60 taxa of Chamaecrista, identifying meaningful morphoanatomical characters that may shed light on the evaluations of the taxonomic and phylogenetic framework of Chamaecrista, especially C. sect. Absus. Standard light microscopy techniques were used to anatomically characterize the leaves. The anatomical data were subjected to a multivariate analysis (Jaccard index). Epidermal papillae on the abaxial side, the distribution and types of secretory and tector trichomes, variations in the arrangement of the vascular system of the midvein and the type of arrangement of the vascular system of the petiole are useful for separating species or groups of species. The presence and type of secretory structure, the type and position of stomata and the venation pattern are important in establishing the affinities between sections and subsections. The phenetic analysis demonstrates that the anatomical data contribute to the establishment of affinities between sections and subsections, supporting the elevation of the taxonomic status of the clade Baseophyllum to section and the insertion of C. absus (C. sect. Grimaldia) into C. sect. Absus, corroborating molecular studies.