http://repositorio.ufgd.edu.br/jspui/handle/prefix/4631 Wed, 04 Feb 2026 19:05:51 GMT 2026-02-04T19:05:51Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6342 Título: Revisão Taxonômica De Caiapobrycon Malabarba & Vari (2000) Characiformes: Characidae Autor(es): Seren, Thomaz Jefrey Primeiro Orientador: Dagosta, Fernando Cesar Paiva Abstract: The subfamily Stevardiinae is one of the most diverse within Characidae, containing 371 valid species. One of them is Caiapobrycon tucurui, a small-sized species that inhabits clear, flowing waters with sandy and rocky substrates. It is distinguished from other characids by its ventral mouth, expanded maxillary bone, and strongly articulated infraorbitals 1 and 2. Caiapobrycon was described in a monotypic genus as Caiapobrycon tucurui, but based on the revisionary study conducted herein, this genus has at least three additional undescribed species: Caiapobrycon sp. n. 1, from the Xingu River basin which is distinguished from its congeners by the absence of a humeral spot,; Caiapobrycon sp. n. 2, from the Juruena River basin, distinguished by a relatively longer papillae on the lips and maxillary region; and Caiapobrycon sp. n. 3, also from the Xingu River basin, which differs from all other taxa by having a vertical spot at the insertion of the median caudal-fin rays. Until now Caiapobrycon was only distributed in the Tocantins River basin, but based on the results provided by us, its geographic distribution is expanded to other two more basins draining from the Brazilian crystalline shield: the Xingu and the Juruena rivers basins. Editor: Universidade Federal da Grande Dourados Tipo: Dissertação Mon, 18 Mar 2024 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/6342 2024-03-18T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6341 Título: Composição química do óleo essencial das folhas de Duguetia furfuracea A. St. Hill (Annonaceae) em função da variação sazonal e caracterização morfoanatômica e histoquímica Autor(es): Rhoden, Samantha de Lima Primeiro Orientador: Formagio , Anelise Samara Nazari Abstract: Duguetia furfuracea A. St. Hill., Annonaceae is a subshrub found in the cerrado, popularly known as "ata-brava," "araticum-seco," "araticum," and "araticum-miúdo," used in folk medicine for the treatment of rheumatism and kidney colic. Chemical studies report the presence of major compounds in the essential oil obtained from the leaves, such as bicyclogermacrene, (E)-asarone, 2,4,5-trimethoxystyrene, α-gurjunene, and cyperenand. Seasonal factors like temperature, humidity, and hours of light may influence the production and quality of the essential oil. This study investigated the yield and variation in the chemical composition of the essential oil, morphoanatomy, histochemistry of the leaves and stem of D. furfuracea, as well as antioxidant activity, rainfall analysis, and soil chemical analysis. Monthly collections (from May 2022 to April 2023) were conducted in the municipality of Dourados MT. Essential oil extraction from the twelve samples coded as (OEDF) was performed by hydrodistillation, followed by gas chromatography-mass spectrometry (GC/MS) analysis. Morphoanatomical and histochemical characterization of leaves and stems was done using light microscopy and scanning electron microscopy. Antioxidant activity was evaluated using the DPPH reagent (2,2-diphenyl-1-picrylhydrazyl). There was variation in the essential oil yield in all months, with higher yield in July (OEDF-JL 0.062%) and lower in June (OEDF-JU 0.008%). Yield was not affected by annual precipitation rates. Soil analyses showed high iron and hydrogen content, indicating an acidic and dystroferric soil. GC/MS analysis of all samples showed β-elemene (17.5% - 5.94%), germacrene B (13.48% - 5.19%), and β-pinene (31.06% -1.08%) as major compounds. Isogeijerene C (1.02%) appeared only in OEDF-A, and δ cadinene (1.33%) in OEDF-F. Moreover, all OEDF samples exhibited antioxidant activity by free radical inhibition with IC50 values of 2.50 mg/mL (EODF-F), 2.67 mg/mL (EODF-M), 1.80 mg/mL (EODF-JL), 2.59 mg/mL (EODF-AG), 2.66 mg/mL (EODF-S), and 2.41 mg/mL (EODF-D) in DPPH. Our analysis was conducted on six samples due to similarity between months regarding the compounds found in the specimens, demonstrating antioxidant activity in all six samples. The presence of certain compounds like sabinene, γ-terpinene, β-elemene, β pinene, and germacrene B may justify this antioxidant action. Morphoanatomical analysis revealed non-glandular stellate trichomes and scales in the epidermis, phenolic compounds in both parenchymas, and oil cells found in the collenchyma and mainly in the palisade parenchyma. Histochemical studies showed the presence of essential oil in collenchyma cells and also in the palisade parenchyma. The study demonstrated that D. furfuracea has essential oil with predominant oxygenated monoterpenes and sesquiterpenes, especially β-elemene and germacrene B. Precipitation did not affect oil yield. The oil showed significant antioxidant activity attributed to components like sabinene, β-elemene, germacrene B, and γ-terpinene. Essential oil cells were found in the palisade parenchyma, with phenolic compounds in both parenchymas. It is concluded that D. furfuracea is a promising source of essential oil with seasonal variation in composition and content. Editor: Universidade Federal da Grande Dourados Tipo: Dissertação Mon, 18 Mar 2024 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/6341 2024-03-18T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/6340 Título: Modificações temporais na paisagem em zonas de ecótonos no Mato Grosso do Sul e sua relação com a chegada de propágulos nos fragmentos Autor(es): Marques, Rita de Cassia Gonçalves Primeiro Orientador: Pereira, Zefa Valdivina Abstract: This study was conducted in the state of Mato Grosso do Sul and is structured in two chapters, in ecotone regions where different ecosystems converge. In Chapter 1, we examined how landscape fragmentation affects the diversity of seed rain. It was concluded that the size and complexity of fragments do not affect seed rain diversity, but connectivity influences species richness. We suggest that forest restoration studies focus on creating ecological corridors to promote gene flow among species. In Chapter 2, we investigated how land-use changes over time affect the vegetation structure of the landscape and its implications for forest restoration. We found that pastures were converted to agriculture, but this did not significantly impact vegetation during the analyzed periods. However, the landscape structure in terms of configuration exhibited higher edge density and irregular shape in the 2012 period. Therefore, it is recommended that future work involving forest restoration concentrate on the boundary areas of fragments and on the effects of livestock intensification over the years on plant communities. Editor: Universidade Federal da Grande Dourados Tipo: Dissertação Tue, 05 Mar 2024 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/6340 2024-03-05T00:00:00Z http://repositorio.ufgd.edu.br/jspui/handle/prefix/5976 Título: Ecofisiologia e crescimento inicial de Inga vera willd. sob níveis de sombreamentos e regimes hídricos Autor(es): Cerqueira, Wállas Matos Primeiro Orientador: Scalon, Silvana de Paula Quintão Abstract: Inga vera Willd. is a species of great medicinal and food potential with an effective contribution to ecosystem services. The objective of this work was to evaluate the effect of shading levels and water regimes on photosynthetic metabolism and quality of I. vera seedlings. The seedlings were cultivated under three water regimes, based on the substrate's water retention capacities (CRS): 50%, 75% and 100% and three levels of shading (0% - full sun, 30% and 70%) and evaluated in three periods, being: 25 and 50 days after the submission of the water regimes. After this period, 75% CRA was maintained in all plants for 30 days, characterizing the recovery period (REC). The characteristics of gas exchange, chlorophyll a fluorescence, relative water content, chlorophyll a, b and total index were evaluated. Dickson quality index (DQI), proline content, peroxidase enzymatic activity and total protein content. There was a reduction in photosynthetic rate (A), stomatal conductance (gs), transpiration (E), Rubisco carboxylation efficiency (A/Ci), internal CO2 concentration (Ci), potential photochemical quantum efficiency of photosystem II (Fv/Fm), efficiency of absorbed energy conversion (Fv/F0) and basal quantum production of non-photochemical processes (F0/Fm) in seedlings grown in full sun in all evaluation periods, regardless of the water regime. The highest values of relative water content (CRA) in I. vera leaves were observed at 75% of shading after REC and the water use efficiency (WAE) did not differ statistically between treatments for the same period. There was an increase in the levels of chlorophyll a, b and total in seedlings grown in shade. In general, the highest v averages of leaf area (AF) were observed in seedlings grown at 30% shade regardless of the water regime. The root length (CR) showed an isolated effect with the evaluation periods and treatments, with higher values under 0% of shading and with 100% of CRS (62.88 cm). Seedlings grown under full sun and 30% shading showed higher quality indices (IQD). As for the osmoprotective activity in the roots and leaves of I. vera cultivated at 0% and 30% with lower CRS, in general, higher concentrations of proline were found. Regarding the antioxidant activities, the activity of the enzyme peroxidase in the leaves of I. vera showed greater variations between treatments when compared to the roots. Seedlings under 30% shading and 75% CRS had higher concentrations of total protein in leaves and roots. The shading mitigated the effect of low water availability in I. vera seedlings, keeping the photosynthetic rate high and, when cultivated under full sun (with up to 75% CRS) and 30% shading, they showed higher seedling quality and vigor, not being observed under these conditions significant damage to the photosynthetic apparatus. Editor: Universidade Federal da Grande Dourados Tipo: Dissertação Tue, 07 Mar 2023 00:00:00 GMT http://repositorio.ufgd.edu.br/jspui/handle/prefix/5976 2023-03-07T00:00:00Z