Estudos taxonômicos e morfopolínicos das Cucurbitáceas do Estado de Goiás, Brasil

• Autor(a) principal: Moura, Beryl Eirene Lutz de
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/7298
• topic: Centro-oeste; Florística; Morfopalinologia; Taxonomia; Trepadeiras; Climbers; Cucurbitaceae; Midwest; Taxonomy; Palynology; Pollen morphology; CIENCIAS BIOLOGICAS::BOTANICA

The family Cucurbitaceae Juss. is include in Cucurbitales order in the clade Eurosids I, 2295 spp., included in 129 tropical and temperate genera distributed in seven families of different morphological and ecological characteristics. The family has 98 genera and 975 species. In Brazil is represented by about 30 genera and 157 species. This work deals with the taxonomic study of plants of the Cucurbitaceae family Juss. found in the State of Goias, Brazil to contribute information to update the Flora of Brazil. Exsiccatae analyzes were performed deposited in national and international herbaria and conducting expeditions in the study area. 19 genera and 40 species in the area were located, so 09 genera and 28 species of native plants. Relative to native plants, Cayaponia Silva Manso gender had a greater number of species (8 spp.), followed by Melothria L. (6 spp.), Gurania (Schltdl.) Cogn. (4 spp.), Ceratosanthes Adans. (3 spp.) Psiguria Neck ex. Arn.and Sicyos L. (2 spp.), and the genres Melothrianthus Mart. Crov., Siolmatra Baill, Wilbrandia Silva Manso, are represented by only one species each. Pollen morphology of six native and two sub-spontaneous species of Cucurbitaceae occurring in the state of Goias, Midwest Region of Brazil, were analyzed with the goal of understanding the palynology and taxonomy of selected species. Pollen grains were acetolyzed, measured, described, photographed and electromicrographed. Analysis under the SEM was used to elucidate questions about the ornamentation of the exine. Pollen grains are in monads in Cayaponia podantha Cogn., Ceratosanthes tomentosa Cogn., Luffa operculata (L.) Cogn., Melothria campestris (Naudin) H. Schaefer & S. S. Renner, Momordica charantia L., Wilbrandia hibiscoides Silva Manso or tetrads in Gurania lobata (L.) Pruski and Psiguria umbrosa (Kunth) C. Jeffrey; average size, large or very large in monads and very large in tetrads. The openings ranged from pores in Cayaponia podantha, colpores in other monads and pores in tetrads. Regarding ornamentation, spiny sexine were registered in Cayaponia podantha, perforated sexine in Melothria campestris, micro-reticulated sexine in Gurania lobata and Psiguria umbrosa and reticulated sexine in other taxa. Results allowed the distinction between genera, indicating that the pollen morphology contributes to the taxonomic studies and the family is considered eurypalynous. These data emphasize the importance of pollen morphology for the diagnosis of genera into Cucurbitaceae.