Distilia em Faramea multiflora em um fragmento de floresta no bioma cerrado
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2016-03-28
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Universidade Federal de Goiás
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Distillic species have both types of hercogamy, but in separate individuals, called pin (long-styled) and thrum (short-styled) morphs, characterizing reciprocal herkogamy. This type of floral polymorphism is usually accompanied by a system of heteromorphic self-incompatibility and dysthilic populations tend to have an equal proportion of morphs. The present work aimed to study reproductive biology and verify the pollen flow between the morphs of Faramea multiflora (L). Rich The work was carried out at Santa Cruz Municipal Natural Park in Catalão, southwest of Goiás, Brazil. Information was obtained on phenology, floral biology, floral morphometry, reciprocal hercogamy, isopletia, reproductive system, day and night floral visitors, floral morphometry of both morphs, pollen dimorphism, pollen production and pollen transfer. The population showed mass flowering in the rainy season. Both morphs showed daytime anthesis, but remain long-lived at night attracting night pollinators. The morphs showed reciprocal hercogamy only among the lower sexual whorls and only the height of the thrum morph stigma is not influenced by the size of the corolla. Both morphs showed self-compatibility, especially the thrum morph. F. multiflora flowers were visited by two main groups of pollinators, butterflies during the day and moths at night. Some characteristics appear to be associated with a generalist pollination system, such as the mass flowering pattern and floral longevity that attracts daytime and nighttime pollinators. In addition to the loss of reciprocity between the upper verticils, the study population also presented relaxation in the self-incompatibility system, which may have contributed to the deviation observed in isoplety. Both daytime and nighttime pollinators visited more flowers of the thrum morph, but apart from flower production, which was higher for the thrum morph, no other characteristic seems to explain this difference in the rate of visits. Dimorphism in pollen grain size was observed, with the thrum morph showing larger grains, however, there was no difference in pollen production between the morphs. Stigmas of the thrum morph received more pollen grains and when analyzed for grain quality, the thrum morph also received more legitimate grains while for illegitimate grains there was difference only when analyzing the separate treatments, again with the thrum morph receiving more grains. The pin morph showed a higher male function, while the thrum morph showed a higher female function. Even with pollen dimorphism, pollen production was the same for both morphs. What may be happening in the study population is a deviation in the reproductive fitness of the morphs, which may lead to the total loss of the self-incompatible morph, in this case the pin, and the population to become monomorphic thrum.
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LOPES, D. L. Distilia em Faramea multiflora em um fragmento de floresta no bioma cerrado. 2016. 55 f. Dissertação (Mestrado em Biodiversidade Vegetal) - Universidade Federal de Goiás, Goiânia, 2016.