Résumé
The success of sexual plant reproduction is directly influenced by specific interactions between the pollen and pistil. Light, fluorescence and scanning electron microscopy techniques were used to evaluate the steps of pollination in sour passion fruit plants (Passiflora edulis Sims). In the compatible interaction, pollen tubes grow through stigma projections towards the ovary. The pollen grain surface was found to be spheroidal and to consist of heteroreticulate exine with six colpi. Furthermore, analysis in vivo of pollen-pistil interactions indicated that stigmas of flowers 24 hours before anthesis are unable to discriminate compatible (genetically unrelated) and incompatible (genetically related) pollen grains. Taken together, these results provide insight into the cellular mechanisms underlying pollination in passion fruit plants.
Sujets)
Fleurs/métabolisme , Fleurs/ultrastructure , Passiflora/composition chimique , Pollen/métabolisme , Pollen/ultrastructure , Pollinisation/physiologie , Microscopie électronique à balayage , Microscopie en lumière polarisée , Passiflora/physiologieRésumé
In this study, beta-1,3-glucanase was isolated from Simira glaziovii secretion. The purification process was achieved by a combination of chromatographic methods and was analyzed by SDS-PAGE. The purified enzyme presented an estimated molecular mass of 35 kDa. The optimum pH of enzyme was 5.2
Uma beta-1,3-glucanase foi purificada a partir da secreção de Simira glaziovii, através de vários processos cromatográficos, tendo a análise do perfil protéico acompanhado de SDS-PAGE. A enzima purificada apresentou uma massa molecular estimada de 35 kDa. O pH ótimo obtido para a enzima foi de 5,2.