Sistema distílico e biologia reprodutiva de cinco espécies de Psychotria L. (Rubiaceae) em dois fragmentos do sudeste Goiano

• Ano de defesa: 2013
• Autor(a) principal: Sá, Túlio Freitas Filgueira de
• Orientador(a): Consolaro, Hélder Nagai
• Banca de defesa: Oliveira, Paulo Eugênio Alves Macedo de, Franceschinelli, Edivani Villaron, Consolaro, Hélder Nagai
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Biodiversidade Vegetal (ICB)
• Departamento: Instituto de Ciências Biológicas - ICB (RG)
• País: Brasil
• Palavras-chave em Português: Heterostilia; Sistema reprodutivo; Fenologia; Cerrado; Polinização
• Palavras-chave em Inglês: Heterostyly; Reproductive system; Phenology; Cerrado; Pollination
• Área do conhecimento CNPq: CIENCIAS BIOLOGICAS::BIOLOGIA GERAL
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/3684

Distyly is a reproductive strategy to promote cross-pollination and difficult self-pollination, characterized by the presence of two floral morphs, the pin and the thrum morph. The study aimed to describe the phenological behavior and investigate aspects related to the distylous system of five Psychotria species, such as the pollination biology, the floral morphology, the isoplety and the incompatibility system of the species. The studies were performed in the "Parque Municipal da Mata do Setor Santa Cruz" and "in the Pasto do Pedrinho", in the municipality of Catalão, Goiás. The five species of the genus Psychotria were: P. hoffmannseggiana, P. capitata, P. prunifolia, P. deflexa. and P. trichophoroides. The flowers were collected and fixed in 70% ethanol for the morphometric analysis. The phenology was held for one year for each species. The incompatibility system was tested using hand pollination. The flower visitors were collected, labeled and identified. The results indicate that P. hoffmannseggiana, P. capitata, P. deflexa and P. trichophoroides present distyly, only P. prunifolia was considered as pin-monomorphic . In the reproductive system, P. prunifolia was considered as self-compatible. Although, P. hoffmannseggiana, P. capitata, P. deflexa and P. trichophoroides presented a self-incompatibility system. Regarding to the morphs ratio , all the distylous populations were isopletic. The floral visitors of the five species confirm the entomophilous pollination syndrome. In the phenology, the flower buds of the populations began to emerge in September, one month before the beginning of the flowering, with the months of highest incidence parallel to the emission of the flowers (October to December). The analysis of the relationship between the corolla and the height of the intramorph reproductive verticils, reveals that the corolla considerably interfered in the length of the floral organs. In the reciprocity analysis, the influence of the corolla on the reciprocal herkogamy, had a null or parcial effect in the reciprocity. The present study has been carried out with only one population per species, and it would not be possible to assign distyly with the self-incompatibility of P. capitata, P. deflexa, P. trichophoroides and P. hoffmannseggiana, or even with the monomorphism and self-compatibility of P. prunifolia, as a general condition for these species. However, the results of the present study and additional information from other populations of these same species, lead us to believe that this scenario may repeat in other regions of Brazil.