https://repositorio.ufu.br/handle/123456789/5161 2026-07-19T03:06:45Z https://repositorio.ufu.br/handle/123456789/48897 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. 2026-02-27T00:00:00Z https://repositorio.ufu.br/handle/123456789/48882 Title: Uso de aeronave remotamente pilotada para aplicação de inibidores de florescimento de cana-de-açúcar Abstract: The use of remotely piloted aircraft (RPAs) in agricultural spraying has been increasing due to their advantages, such as efficient water use and application flexibility. However, further research is necessary to understand the dynamics of this equipment under different working conditions, in order to generate recommendations that improve the quality and safety in the use of this new tool. The aim of this study was to evaluate the quality of the application of flowering inhibitors (florpyrauxifen-benzyl at 0.20 and 0.30 L ha⁻¹ and ethephon at 0.66 L ha⁻¹) using RPAs in sugarcane crops at two application rates (10 and 15 L ha⁻¹), resulting in six treatments and one additional untreated control, all with four replications. The trial was repeated in six locations, of which in two, spray deposition (by detecting a tracer through spectrophotometry) and droplet spectrum (by analyzing water- sensitive paper) were evaluated. In all trials, crop injury symptoms and productivity were assessed. Raw material quality (soluble solid content – BRIX and recoverable sugar – ATR) was also evaluated in three locations, along with the physical-chemical properties of the spray solutions. It was concluded that the choice of product greatly influenced the physical-chemical characteristics of the spray solution. Florpyrauxifen- benzyl led to a greater reduction in surface tension and contact angle of the droplet, indicators directly related to increased spreading and coverage potential on the target surface. However, it also resulted in a smaller volumetric median diameter (VMD), an indicator related to greater risk of drift. Ethephon resulted in higher deposition, possibly related to less interference from drift or volatilization. The use of RPA for the application of flowering inhibitors and the tested application rates were technically viable and safe for sugarcane cultivation, with the observed injuries related to the sensitivity of variety RB96 6928 and not to the application technology itself. 2025-08-21T00:00:00Z https://repositorio.ufu.br/handle/123456789/48849 Title: Quantificação e neutralização de emissões de gases de efeito estufa do 11° Simpósio de Ciências Agrárias e Ambientais (SICAA) 2026-03-03T00:00:00Z https://repositorio.ufu.br/handle/123456789/48835 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. 2026-04-11T00:00:00Z