Reproductive phenology and germination of Guapira hirsuta (Choisy) Lundell
DOI:
https://doi.org/10.4336/2026.pfb.46e202502342Keywords:
Nyctaginaceae, Recalcitrant seeds, Desiccation toleranceAbstract
The objective of this study was to characterize the reproductive phenology, classify seeds desiccation tolerance, and model the germination curve of the Guapira hirsuta. For the phenological study, 17 individuals were monitored monthly from October 2021 to September 2022 for the presence or absence of flowers and fruits. Desiccation tolerance was assessed using seeds from eight individuals of G. hirsuta, collected in August 2021 in the Lago da Pedra do Cavalo Environmental Protection Area (Bahia, Brazil). Four treatments (15%, 12.5%, 10%, and 5% moisture content) were tested, with four replicates of 25 seeds each. Germination tests were conducted in a germination chamber. Logistic and Gompertz models were tested to fit the germination curve of the fresh seeds. G. hirsuta flowering occurred in June, with fruiting from July to September. The timing of seed dispersal at the study site coincided with the period of low water availability. G. hirsuta seeds are recalcitrant and exhibit slow germination, requiring 150-days for germination to stabilize and 92-days to reach 50% germination.
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Copyright (c) 2026 Karine Pacheco de Jesus, Manuela Oliveira de Souza, Dráuzio Correia Gama, Tamires Santiago de Souza, Grênivel Mota da Costa, Andrea Vita Reis Mendonça
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