DSpace Collection:

Descrição anatômica de espécies arbóreas do Cerrado

2026-02-27T00:00:00Z

Title: Descrição anatômica de espécies arbóreas do Cerrado Abstract: The Cerrado biome is globally recognized as a biodiversity hotspot, harboring a vast floristic richness that, however, still lacks detailed anatomical studies, especially in transition regions and isolated fragments. This study aimed to characterize the macroscopic and microscopic wood anatomy of five native tree species occurring in the municipality of Monte Carmelo, Minas Gerais: Terminalia argentea (Combretaceae), Dimorphandra mollis, Copaifera langsdorffii, Hymenaea stigonocarpa (Fabaceae), and Aegiphila lhotskiana (Lamiaceae). Samples were collected from three individuals per species, processed according to standard microtomy and maceration standards. The results revealed convergent adaptive strategies, such as simple perforation plates and the predominance of solitary vessels, features associated with hydraulic safety in seasonal environments. A highlight is the unprecedented microscopic description of Aegiphila lhotskiana, which presented exclusively uniseriate rays and semi-ring porosity. Significant phenotypic plasticity was observed in Dimorphandra mollis, whose growth rings appeared indistinct in the studied population, diverging from consolidated literature. Wood anatomy proved to be an effective tool for the taxonomic distinction of the analyzed species, in addition to providing insights into plant adaptations to the edaphoclimatic conditions of the Cerrado in Minas Gerais.

Quantificação e neutralização de emissões de gases de efeito estufa do 11° Simpósio de Ciências Agrárias e Ambientais (SICAA)

2026-03-03T00:00:00Z

Title: Quantificação e neutralização de emissões de gases de efeito estufa do 11° Simpósio de Ciências Agrárias e Ambientais (SICAA)

Extração, avaliação da viabilidade e armazenamento de pólen de pequi

2026-04-11T00:00:00Z

Title: Extração, avaliação da viabilidade e armazenamento de pólen de pequi Abstract: The pequi (Caryocar brasiliense Cambess.) is a native species of the Brazilian Cerrado with significant ecological and socioeconomic importance, whose use in breeding programs is associated with pollen viability. This study aimed to establish and optimize protocols for pollen extraction, in vitro germination, and storage of this species. Three extraction methods were compared (anthers removed with scissors, anthers manually detached, and natural release by immersion of floral buds), five culture media: (A) 10% sucrose; (B) 15% sucrose; (C) 20% sucrose; (D) 10% sucrose + 0.65 mM boric acid; and (E) 10% sucrose + 1.3 mM boric acid; and three storage conditions (room temperature ~25 °C, refrigeration ~8 °C, and freezing ~−15 °C), with viability evaluated over 131 days. Immersion of floral buds was the most efficient extraction method, providing higher pollen yield and purity. The medium containing 10% sucrose and 1.3 mM boric acid showed the highest germination rate (67.28%). Regarding storage, room temperature led to a marked decline in viability, with total loss after approximately 42 days, whereas refrigerated conditions showed greater stability throughout the experimental period. No statistically significant differences were observed between refrigeration and freezing (p ≥ 0.05), although refrigeration exhibited more stable behavior. The results indicate that the combination of floral bud immersion for extraction, germination in a medium containing 10% sucrose and 1.3 mM boric acid, and storage under refrigeration constitutes an efficient strategy for managing C. brasiliense pollen, with potential applications in conservation and genetic improvement.

Análise biométrica de sementes e frutos em diferentes matrizes de jatobá-do-cerrado

2025-12-16T00:00:00Z

Title: Análise biométrica de sementes e frutos em diferentes matrizes de jatobá-do-cerrado Abstract: The Cerrado Jatobá (Hymenaea stigonocarpa) is a species of great ecological and socioeconomic importance, suitable for restoration and with commercial potential. This study aimed to evaluate biometric characteristics of fruits and seeds from 22 H. stigonocarpa mother trees in Monte Carmelo, MG, Brazil. The 30 largest fruits and the 30 largest seeds from each mother tree were evaluated for weight, length, width, thickness, and number of seeds per fruit. The data were subjected to analysis of variance, and the means were compared using the Scott-Knott test (5%). Wide variability was observed among fruits and seeds. For the fruits, weight showed the greatest range (14.98 to 161.64 g; CV = 30%) and length the smallest (10.13 to 17.20 cm; CV = 16%). For the seeds, thickness was the most variable (3.25 to 25.03 mm; CV = 21%) and length the least variable (13.33 to 28.91 mm; CV = 8%). There was a significant difference between the matrices for all characteristics (p < 0.05). Matrix 13 stood out for fruit characteristics, while matrix 14 excelled in the number of seeds per fruit. For the seeds, matrices 7 and 9 were in the first or second groups for all variables. The variability in the biometric characteristics of the fruits and seeds among the jatobá-do-cerrado matrices indicated strong potential for possible selection of superior characteristics. New analyses have been conducted and are underway to estimate the genetic parameters of the evaluated characteristics, the correlation between the evaluated characters, and to assist in seed collection strategies and seedling production of the species.