Biologia floral e sistema de autoincompatibilidade de Bauhinia brevipes Vogel (Fabaceae), no município de Goiás, Estado de Goiás, Brasil

• Ano de defesa: 2014
• Autor(a) principal: Almeida, Elga de Fátima
• Orientador(a): Franceschinelli, Edivani Villaron
• 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: Cercidae; Pata-de-vaca; Sistema de incompatibilidade e eficiência reprodutiva
• Palavras-chave em Inglês: Cercidae; Incompatibility system and reproductive efficiency
• Área do conhecimento CNPq: CIENCIAS BIOLOGICAS::BOTANICA
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/4402

The plant reproductive biology involves all the features (morphological, anatomical or physiological) of a species that participate in the reproduction of its individuals. The Fabaceae family is one of the most important of the Cerrado, the genus Bauhinia being one of the most diversified. Several studies with species of Bauhinia L. showed diversity in floral shapes, reproductive phenology, reproductive system and interactions with different groups of pollinators. In general, the Bauhinia species are outcrossing and have low reproductive efficiency. Bauhinia brevipes is common in the municipality of Goiás-GO and has floral features compatible with the syndrome chiropterophily: white flowers that release a strong odour overnight, producing large amounts of nectar with low sugar concentration. Flowers of B. brevipes may have reduced ovaries or anthers with low production of viable pollen, indicating that this species moves towards sexual separation in some flowers. Although the visit the bats to flowers were not seen, their flights over the plants were observed. A test of exclusion of diurnal pollinators showed the efficiency of nocturnal pollinators in B. brevipes. The flowers of B. brevipes not have herkogamy as the main factor to avoid inbreeding, but some flowers positioned above the anthers stigma were observed. The species present gametophytic selfincompatibility and therefore requires the pollinators visit to ensure pollinating pollen exchange among different and unrelated plants. Bauhinia brevipes has an average 20% of reproductive efficiency. In general, the species showed a high level of pollen limitation (0.73). The largest fruit production occurs in the middle position of the inflorescence. Most of fruit produced occurs in the median position of the inflorescence, when possibly the availability of pollen in the system is higher and resources are available for their development.