Banca de QUALIFICAÇÃO: DENIVAL REZENDE QUITERIO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : DENIVAL REZENDE QUITERIO
DATE: 17/03/2026
TIME: 09:30
LOCAL: licbio
TITLE:

Study of the Reproductive Phenology of a Population of the Species Cereus trigonodendron K. Schum. ex Vaupel (Cactaceae) in the Western Amazon.”

KEY WORDS:

Reproductive phenophases; climatic fluctuations; temperature; floral buds; flowers; unripe fruits; ripe fruits

PAGES: 46
BIG AREA: Ciências Biológicas
AREA: Biologia Geral
SUMMARY:

Cereus trigonodendron is a non-endemic cactaceae species whose occurrence in Brazil is limited to the state of Rondônia (RO). This succulent grows on rocky outcrops and produces yellow flowers and pink and red fruits, respectively. The aim of this study was to evaluate the effect of climatic and seasonal variables on the reproductive phenology of this species. Monthly monitoring of flower and fruit production was conducted from May 2022 to May 2024. Observations were divided into four categories: (1) floral bud, (2) open flower, (3) unripe fruit, and (4) ripe fruit. Climatic data, including temperature and precipitation, were obtained from the Santo Antônio Hydroelectric Power Plant (HPP). The flowers exhibited nocturnal anthesis and reached up to 27 cm in length, while the fruits reached up to 12 cm in length. It was observed that the reproductive phenophases of Cereus trigonodendron followed a seasonal pattern, varying according to seasonal climatic fluctuations. A total of 770 fruits were produced (monthly mean = 64; median = 54), with greater production between December and February (mean of 155 fruits/month) and a production peak in January (203 fruits) during the first cycle. In the second cycle, 1,296 fruits were recorded (mean production = 107/month; median = 80 fruits). The highest production occurred between October and March (mean = 180 fruits/month), with a peak in December (301 fruits). The annual rainfall index and mean minimum temperature were 2,154 mm and 21.9 °C, with low variability throughout the months (standard deviation ≈ 0.8), and 1,522 mm and 23.1 °C, showing greater variation (SD ≈ 1.1), respectively for the first and second cycles. The mean maximum temperature observed was 31.3 °C and 32.8 °C for the first and second cycles, respectively. These observations suggest that the months from December to February present the most favorable conditions for flower and fruit production. The number of fruits observed in the second cycle indicates a positive correlation with rainfall regime and temperature. These findings have important implications for the management and conservation of the species in response to climatic fluctuations.

COMMITTEE MEMBERS:
Presidente - 1223767 - ANTONIO LAFFAYETE PIRES DA SILVEIRA
Interna - 1387002 - OSVANDA SILVA DE MOURA
Externo à Instituição - SEMIRIAN CAMPOS AMOÊDO