Banca de DEFESA: RONILCE MARIA PIRES DE MORAIS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : RONILCE MARIA PIRES DE MORAIS
DATA : 26/11/2025
HORA: 08:00
LOCAL: CELBE e meet.google.com/pfp-xewy-azc
TÍTULO:

Floral biology of Garcinia brasiliensis Mart.

PALAVRAS-CHAVES:

Garcinia brasiliensis; floral morphology; pollination; Pantanal; inflorescence; fruiting

PÁGINAS: 66
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

Garcinia brasiliensis is a shrub endemic to Brazil adapted in humid environments with periodic flooding, such as gallery forests in the Pantanal, floodplain forests of the Amazon, and restinga formations of the Brazilian Atlantic Forest. This study aimed to investigate the floral morphology of Garcinia brasiliensis and its relationship with pollination and reproductive success. The research was conducted in the Pantanal of Mato Grosso, in Cáceres – MT, across four sampling sites, from April to November 2024. Flowering phenology was observed in 500 flowers collected from 28 plants. Collections were executed over seven months, five days a week, with three hours of observation per day, totaling approximately 420 observation hours (3 h/day × 5 days/week × 28 weeks). The inflorescence of Garcinia brasiliensis is of the short, dilated peduncle type, with monopodial branching forming racemes, each bearing two to six pedicels that support individual floral buds. Buds were green, with two sepal-like sepals, one white petal, and one petaloid tepal. The flowers have a calyx with two fleshy sepals and a corolla composed of four distinct segments differing in texture, shape, and color. Bisexual flowers were observed to be predominant (95.53%), while staminate flowers were rare (4.47%). Flowering occurred from January to November, with the highest number of buds and flowers in anthesis August (38.95%), with no floral activity recorded in March. In January and September, flowers in anthesis represented more than 13%, and early-stage buds exceeded 4%. Floral visitors were primarily from the Apidae family (Meliponini), which were the most frequent (75%), while Vespidae were observed on fewer plants. Fruiting occurred from April to October, with mature fruits being yellow and ranging from small to large (71.23%), and immature fruits being small and green (8.77%). Fruit maturation ranged from 12 to 135 days, with most maturing between 12 and 69 days. The fertilization rate of flowers was 68.06%, resulting in fruit formation. Most fruits contained one seed (76.71%), some had two seeds (15.07%), and others had no seeds (5.48%). This pattern indicates that most ovules were fertilized (68.06%), while the number of unfertilized ovules per flower ranged from one to three. Therefore, the floral morphology of Garcinia brasiliensis—with bisexual flowers, short-dilated pedunculate inflorescences, fleshy sepals, and a morphologically diverse corolla—supports effective pollination and reproductive success in ecosystems such as the Pantanal.

MEMBROS DA BANCA:
Presidente - 80797005 - CARLA GALBIATI
Interna - 83215001 - MARIA ANTONIA CARNIELLO
Externa à Instituição - HELOISA ALVES DE LIMA - UFRJ