Biologia floral e sistema de autoincompatibilidade de Bauhinia brevipes Vogel (Fabaceae), no município de Goiás, Estado de Goiás, Brasil
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2014-04-23
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Universidade Federal de Goiás
Resumo
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.
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ALMEIDA, E. F. Biologia floral e sistema de autoincompatibilidade de Bauhinia brevipes Vogel (Fabaceae), no município de Goiás, Estado de Goiás, Brasil. 2014. 47 f. Dissertação (Mestrado em Biodiversidade Vegetal) - Universidade Federal de Goiás, Goiânia, 2014.