| Journal: | Acta botanica brasilica |
| Database: | PERIÓDICA |
| System number: | 000271321 |
| ISSN: | 0102-3306 |
| Authors: | Barros, Mariluza A. Granja e1 |
| Institutions: | 1Universidade de Brasilia, Departamento de Botanica, Brasilia, Distrito Federal. Brasil |
| Year: | 2002 |
| Season: | Ene |
| Volumen: | 16 |
| Number: | 1 |
| Pages: | 113-122 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Artículo |
| Approach: | Analítico |
| English abstract | The synchronous flowering and the breeding systems of Kielmeyera abdita Saddi, K. coriacea Mart., K speciosa St. Hil. and K. variabilis Mart., were investigated at Fazenda Água Limpa of the University of Brasília, Brasília (DF). The four Kielmeyera species are sympatric and frequent on the cerrados. The flowering period of all species had about two or three months. K. abdita, K. coriacea and K. variabilis flower synchronously during the dry season from August to December and K. speciosa flower isolated during the wet period from February to May. The flowers have similar floral morphology, with dish-shaped, white-pinkish corolla (K. abidita, K. coriacea, K. speciosa or white (K. variabilis), contrasting with the brush-like androecium of many yellow stamens, with apical glands which produce a sweet odour charateristic of Kielmeyera. Andromonoecy was observed in all species, except in K. speciosa. The flowers are entomophilous and being visited by 21 bee species. But only female bees of Xylocopa hirsutissima Maidl and X. frontalis (Olivier), were considered effective pollinators, because of their efficience as pollen collecting. The species of Kielmeyera are self-incompatible adapted to cross-pollination. Pollen tubes were blocked in the ovaries, suggesting late-acting self-incompatibility. The percentage of fruit set from crosses was higher (K.abdita 33%, K. coriacea 48,5%, K.speciosa 41,5% and K.variabilis 36,5%) than from natural pollination (K.abdita 13,3%, K. coriacea 30%, K.speciosa 23% and K.variabilis 30%). This suggests that, even though the great constancy of Xylocopa sa visitors of Kielmeyera flowers, pollen flow may be ineficient to crosses, and promote geitonogamy or interspecific pollen transfer, which would obstructed the eggs fertilization |
| Disciplines: | Biología |
| Keyword: | Botánica, Fisiología vegetal, Floración, Kielmeyera, Lista de especies, Fenología, Alelopatía, Mutualismo, Polinización, Guttiferae |
| Keyword: | Biology, Botany, Plant physiology, Kielmeyera, Flowering, Species checklist, Phenology, Allelopathy, Mutualism, Pollination, Guttiferae |
| Full text: | Texto completo (Ver HTML) |
