Search Results (579)

Bowdichia virgilioides Kunth is a tree largely present in South America, notably in the Cerrado savannah. The species is known for the quality of its dense and resistant wood, used in construction and furnishing. B. virgilioides is also a medicinal plant used, from leaves to roots, for the treatment of various human pathologies (pharyngitis, bronchitis, healing wounds, diabetes, and arthritis). The present review provides an analysis of the scientific literature pertaining to B. virgilioides, with a focus on pharmacological activities. Aqueous and organic extracts have been used to treat inflammatory pathologies and to combat infectious diseases caused by microorganisms and parasites. All phytochemicals at the origin of the bioactivities of extracts have been identified, including 37 terpenoids, 8 alkaloids, 21 flavonoids and 13 other products. All natural products are discussed, with a focus on a dozen compounds with well-documented pharmacological properties and/or a known mechanism of action. Key products include ormosanine (alkaloid), vouacapane (diterpenoid), lupeol (terpenoid), isoquercetin (flavonoid), isocordoin (chalcone), and little-known specific products (bowdichine and bowdenol). The botanical and phytochemical analysis shed light on this valuable Fabaceae species with the objective to promote its preservation and cultivation, as well as further pharmacological investigations aimed at rationalizing its long-established ethnobotanical use. Full article

The selection of superior maize genotypes is complex due to the quantitative and intercorrelated nature of agronomic traits and their strong environmental influence, which limits the efficiency of direct selection and requires multivariate approaches. This study aimed to compare the efficiency of seven selection indices in identifying superior maize hybrids, quantify the genetic gains provided by each method, and evaluate the agreement among indices in genotype classification under Brazilian Cerrado conditions. Seventy-three maize genotypes were evaluated across multiple environments, considering grain yield and lodging resistance as primary traits and plant health, earliness, plant height, and ear height as secondary traits. The evaluated indices included direct and indirect selection, the Smith–Hazel classical index, the desired genetic gains of Pesek and Baker, the weight- and parameter-free index of Elston, the multiplicative index, the rank sum index of Mulamba and Mock, and the Genotype–Ideotype index. The results revealed differences in efficiency among methods for simultaneous trait selection. The Elston, Mulamba and Mock index and the Genotype–Ideotype index provided a better balance between productivity and other agronomic traits, resulting in more balanced genetic gains. In contrast, the Pesek and Baker and multiplicative indices were less efficient for joint selection, while direct selection and the Smith–Hazel index were more effective when applied to isolated traits. Overall, the combined use of indices improved selection reliability and enabled the identification of superior and more stable genotypes for the Cerrado. Full article

In the Cerrado, phosphorus (P) availability is limited inter alia by the chemical characteristics of the soil. This study aimed to evaluate the effects of different sources and rates of phosphate fertilizers on P dynamics, soybean productivity, and plant nutrition in Glycine max cultivated in a Yellow Oxisol of the Maranhão Cerrado. Two experiments were conducted in a randomized complete block design during the 2021/2022 growing season. The first experiment followed a 5 × 3 factorial design, with five P sources (one control and four corrective sources) and three soil sampling depths. The second experiment used the corrective fertilization history of the areas from the first study as the first factor and three P₂O₅ rates applied at sowing as the second factor, with three replications. In the soil, Fe-bound P (P-Fe), Ca-bound P (P-Ca), Al-bound P (P-Al), and available P were evaluated; in the plant, grain yield, thousand-grain weight, total dry matter, and P concentration in leaves, grains, and the whole plant were determined. An interaction between P sources and soil depths was observed for P-Fe and P-Ca (0–0.10 > 0.10–0.20 > 0.20–0.40 m), indicating low vertical mobility of P in the soil profile. In addition, increasing P₂O₅ rates raised P contents in the soil and plant tissues across all treatments. For the Itafós source, soil P increased from 2.66 to 4.22 mg kg⁻¹ at 0.0 and 120.0 kg ha⁻¹ of P₂O₅, respectively, which resulted in a marked increase in soybean grain yield, rising from 1484.93 kg ha⁻¹ at 0.0 kg ha⁻¹ to 3418.60 kg ha⁻¹ at 120.0 kg ha⁻¹ of P₂O₅, highlighting the importance of adequate phosphate fertilization for agricultural systems in Cerrado soils. P-Al showed a positive correlation with soil available P, whereas P-Fe was correlated with the treatments TSP10, TSP0, and Itafós20. Full article

This study evaluated the effects of ammonium sulfate [(NH₄)₂SO₄] addition and land-use history on greenhouse gas emissions (CH₄, CO₂, N₂O) and inorganic nitrogen dynamics (NH₄⁺ and NO₃⁻) in Brazilian Cerrado soils. The objective was to determine how fertilization interacts with native and agricultural soils to regulate key biogeochemical processes. Soil samples from native and agricultural areas were collected in four regions (Araras, Sorocaba, Itirapina, and Brasília), representing contrasting pedoclimatic conditions and soil textures under different cropping systems. Samples were incubated under controlled conditions, with greenhouse gas fluxes analyzed by gas chromatography and inorganic nitrogen concentrations determined by colorimetric methods. Nitrogen fertilization inhibited CH₄ consumption in native and agricultural soils and reversed fluxes to emissions in sandy soils. CO₂ emissions increased in native soils but decreased in agricultural soils, suggesting effects of soil fertility and carbon stocks. N₂O emissions increased mainly in native soils, reflecting intensified nitrification and denitrification, whereas agricultural soils responded heterogeneously. Nitrogen addition altered NH₄⁺ and NO₃⁻ consumption, indicating enhanced oxidation and microbial assimilation. These results demonstrate that land-use history influences soil biogeochemical responses to nitrogen, underscoring the importance of site-specific fertilization in mitigating emissions and promoting sustainability in the Cerrado. Full article

Spodoptera eridania (Cramer, 1792) is increasingly reported from potato (Solanum tuberosum L., Solanaceae) in the Brazilian Cerrado, where infestations can cause substantial yield losses. Insecticides may alter the behavioral ecology of agricultural pests. The adaptability of S. eridania mediated by insecticides, especially regarding oviposition behavior, remains poorly understood. This study aimed to evaluate the spatial distribution and oviposition traits of S. eridania on potato plants under chlorfenapyr spraying. Egg masses were collected weekly, day after planting (DAP), totaling 322 collections up to the 91st DAP. Evaluations included the vertical plant strata (upper, middle and lower thirds), leaf surface (adaxial vs. abaxial), and density of scales covering egg masses (high, low, or absent). Results showed that nearly 90% of egg masses were deposited in the upper and middle thirds of the plants. Insecticide spraying modulated oviposition behavior because females preferred the middle third in treated plants, whereas oviposition predominated in the upper third of untreated plants. Moreover, under chlorfenapyr, 93.0 ± 1.2% of egg masses were placed on the abaxial surface. These findings highlight the role of insecticide-mediated behavioral shifts in shaping host-pest interactions and provide relevant insights for integrated pest management of S. eridania in potato field systems. Full article

The conversion of native forests into agricultural areas without conservation practices can expose tons of soil organic carbon (SOC) to the atmosphere. This study aimed to evaluate the effect of land use and cover (LULC) on C in regions of the Caiabi (SBC) and Renato (SBR) River sub-basins, located in the Brazilian Cerrado–Amazon transition. Data on physical attributes and SOC were obtained by region (upper, middle, and lower), LULC (cropland, pasture, and native forest), and depth (0–10, 10–20, and 20–40 cm), with five replicates for each variable. The highest SOC values were found in areas with higher clay contents or in areas of native forest or crop residues. In the SBC, there was a negative correlation of SOC with sand and particle density (PD) and a positive correlation with silt. In the SBR, there was a positive correlation between SOC and microporosity and total porosity, and a negative correlation with sand, soil bulk density, and PD. The highest SOC values were found in the SBC upper region, in native forest (107 Mg ha⁻¹), cropland (69 Mg ha⁻¹), and pasture (49 Mg ha⁻¹). In the SBR upper region, the values were highest in pasture and cropland (93 and 58 Mg ha⁻¹), and in the lower region, the values were highest in native forest (48 Mg ha⁻¹). SOC varied in relation to the SBC and SBR regions, the LULC, depth, and physical attributes, especially soil texture. Full article

The Amazon Deforestation Arc remains a critical region for environmental governance, where land-use strategies must consider distinct legal and institutional frameworks across the Amazon and Cerrado biomes. This study applies the Potential Productivity Model (M3P), a theoretical radiation-based framework, to estimate the upper physiological limits of sugarcane (Saccharum officinarum L.) productivity on degraded pastures within the Arc of Deforestation. The model integrates satellite-derived solar radiation with climatic variables to quantify potential productivity under optimal biophysical conditions, providing an objective benchmark for planning-oriented bioenergy assessments. Estimated potential yields range from 153 to 178 t·ha⁻¹·yr⁻¹, consistent with global reference values reported for sugarcane in high-radiation environments and relevant for informing public policies such as Brazil’s Agroecological Zoning of Sugarcane. The results demonstrate that agroclimatic potential alone is insufficient to guide land-use decisions. While degraded pastures associated with the Cerrado biome may accommodate sugarcane cultivation as part of productive land recovery strategies, areas belonging to the Amazon biome require priority actions focused on ecological restoration through agroforestry and integrated crop–livestock–forest systems. Overall, the M3P model offers a scalable and scientifically grounded decision-support framework for strategic planning in environmentally sensitive tropical regions. Full article

Macauba (Acrocomia aculeata) is a promising source of vegetable oils with distinct applications for its pulp and seed fractions. This study presents the first comprehensive quantitative analysis of eleven commercial macauba oils available in the Brazilian market, using validated methods of GC-FID and LC-HRMS. The analysis revealed significant variability among samples. Control pulp oils (PCCs) were characterized by the predominance of oleic acid (C18:1) and palmitic acid (C16:0) methyl esters, and TG 54:3 was the major lipid species, reaching up to 12.11 g 100 g oil⁻¹. For control seed oils (SCCs), the profile was dominated by lauric acid (C12:0) and oleic acid methyl ester; TG 36:0 was the most abundant lipid, which reached concentrations of 49.20 g 100 g oil⁻¹. Among commercial samples, PC3 followed the expected pulp oil profile, whereas PC4 showed deviations. Others commercial samples (PC2, PC5, SC3, SC4, SC5) deviated significantly from expected profiles, showing high levels of linoleic acid (C18:2), and predominance of TG 54:6, with concentrations reaching 61.74 g 100 g oil⁻¹. The integrated GC-FID and LC-HRMS approach provides robust, sensitive, and discriminative analysis of FAMEs and lipid composition of macauba oil samples. These methodologies are essential for quality control in the food and bioproduct sectors, ensuring the chemical integrity of macauba commercial oils. Full article

Understanding the spatial structure of large mammals is critical for conservation planning, especially under increasing habitat fragmentation. This study applies an integrated spatial analysis combining the DBSCAN density-based clustering algorithm and the α-hull method to delineate non-convex geographic ranges of the maned wolf (Chrysocyon brachyurus) across South America. Using 454 occurrence records filtered for ecological reliability, we identified 11 geographically isolated α-populations distributed across five countries and multiple biomes, including the Cerrado, Chaco, and Atlantic Forest. The sensitivity analysis of the α parameter demonstrated that values below 2 failed to generate viable polygons, while α = 2 provided the best balance between geometric detail and ecological plausibility. Our results reveal a highly fragmented distribution, with α-populations varying in area from 43,077 km² to 566,154.7 km² and separated by distances up to 994.755 km. Smaller and peripheral α-populations are likely more vulnerable to stochastic processes, genetic drift, and inbreeding, while larger clusters remain functionally isolated due to anthropogenic barriers. We propose the concept of ‘α-population’ as an operational unit to describe geographically and functionally isolated groups identified through combined spatial clustering and non-convex hull analysis. This approach offers a reproducible and biologically meaningful framework for refining range estimates, identifying conservation units, and guiding targeted management actions. Overall, integrating α-hulls with density-based clustering improves our understanding of the species’ fragmented spatial structure and supports evidence-based conservation strategies aimed at maintaining habitat connectivity and long-term viability of C. brachyurus populations. Full article

This study aimed to develop a methodology to evaluate, through RGB image processing, the wheat cultivar TRIO Calibre under three irrigation levels (100, 50, and 25%), with or without the application of Bacillus aryabhattai, in Brazilian Cerrado soil. The experimental scheme was a $3\times 2$ factorial design with five replicates. Images were collected, numbered, and organized into files, which were transformed to grayscale. During processing, the grayscale level co-occurrence matrix (GLCM) technique was applied and implemented in four main directions (0°, 45°, 90°, and 135°), and 13 statistical descriptors were extracted. At physiological maturity, the plants were harvested, and the following yield components were evaluated: plant height (PH), number of spikes per plant (NS), number of grains per spikes (NGS), average grain weight (AGW), and total prodution of grains (TPG). Irrigation influenced all the variables, with higher TPG and NS at 100% and 50% water and higher AGW at 25% water. The results indicated that the “contrast” descriptor in the 90° and 135° GLCM directions was the most efficient in differentiating treatments, which presented better performance in the 90° direction and was significantly correlated with the NS ($r=-0.48$, $p<0.05$) and TPG ($r=-0.46$, $p<0.05$). The analyses demonstrated that the methodology has the potential to be adapted for the analysis of under controlled conditions, contributing to more sustainable agricultural practices. Full article

Murundus fields (wetland earth-mounds) represent a relatively understudied physiognomy in the Cerrado biome. This study aimed to evaluate the composition, life history, phytosociology, endemism, and conservation status of woody plant species in murundus fields in a forestry-dominated landscape in the Brazilian savanna. We established 40 plots, each measuring 50 × 20 m, where all live shrub-arboreal plants with a trunk diameter at the base of ≥1 cm and a height > 0.5 m were identified. Using these data, we calculated the absolute and relative values of density, dominance, and frequency, as well as the importance value index. In addition, we estimated Shannon’s and Simpson’s diversity indices and Pielou’s equability index. Our findings included 155 species, 69 genera, and 38 families in the study area. The invasive exotic species Pinus caribaea Morelet showed the highest importance value, followed by Jacaranda caroba (Vell.) DC., Miconia albicans (Sw.) Steud., Erythroxylum suberosum A.St.-Hil., and Miconia fallax DC. The pronounced presence of P. caribaea is a matter of concern and highlights the need for control measures, given its potential to hinder the regeneration of native species. We identified species occurring in various Cerrado phytophysiognomies, suggesting that murundus fields function as transitional habitats. This study underscores the importance of conserving species within the inadequately studied Cerrado physiognomy. Full article

The protection of Indigenous Territories - ITs in the state of Maranhão, located in the Northeast region of Brazil, represents a major challenge at the intersection of environmental conservation and territorial rights. Situated between the Amazon and Cerrado biomes and within the MATOPIBA agricultural frontier, the state faces increasing anthropogenic pressures that accelerate land use changes, intensify fire regimes, and increase greenhouse gas emissions. This study assessed the temporal dynamics of land use and land cover and their relationship with fire in officially recognized Indigenous Territories from 1985 to 2023 using remote sensing, geoprocessing, and spatial analysis in Google Earth Engine. Indigenous Territories lost 185,327 ha of native vegetation, of which 66.9% corresponded to forest and 33.1% to savanna, yet still retained 2028.755 ha in 2023, with 81.2% classified as forest. Fire recurrence reached up to 37 events per pixel, with Araribóia, Kanela, and Porquinhos dos Canela Apãnjekra exhibiting the highest frequencies. During the 2015–2016 El Niño, Araribóia recorded the largest fire episode, with 200,652 ha burned (48.5%). Between 2013 and 2023, total greenhouse gas emissions reached approximately 709 Mt CO₂eq, with 85% originating from fires and 15% from deforestation. The findings highlight the need to integrate traditional knowledge, territorial governance, and Integrated Fire Management strategies to strengthen the protection of Indigenous Territories and support the preservation of Indigenous livelihoods in Maranhão. Full article

The mitigation of greenhouse gas emissions in livestock farming is one of the main challenges for agriculture in the Cerrado biome. Among promising practices, the use of soil remineralizers (REM) stands out as a sustainable and complementary alternative to conventional fertilizers. This study evaluated the effects of applying REM derived from basalt and biotite schist on emissions of N₂O, CO₂ and CH₄, the global warming potential (GWP), as well as on soil carbon and nitrogen in Urochloa brizantha cv. BRS Paiaguás pasture. The experiment was conducted in randomized blocks with five treatments (control, KCl, basalt 8.33 Mg ha⁻¹, basalt 40 Mg ha⁻¹, and biotite schist 151 Mg ha⁻¹). Results indicated that KCl and high-dose basalt (40 Mg ha⁻¹) promoted greater accumulated N₂O emissions and higher GWP values. In contrast, biotite schist reduced N₂O emissions and showed the lowest GWP (81.67 kg CO₂ eq. ha⁻¹), while basalt at a moderate dose (8.33 Mg ha⁻¹) increased soil C and N stocks. It is concluded that soil remineralizers, especially those derived from biotite schist, represent viable alternatives to reduce environmental impacts and promote the sustainability of tropical agricultural systems in Cerrado biome. Full article

In the oilseed–cereal–forage system, information on the performance of grasses of the genus Megathyrsus maximus and on the optimal fertilization levels for forage production is still scarce. Therefore, this study aimed to evaluate forage yield (FY) of pastures established in crop succession systems and subjected to two fertilization regimes during the 2020 and 2021 growing seasons, in the municipality of Rio Verde, Brazil. The experiment evaluated four M. maximus cultivars (Paredão, Zuri, Quênia, and Tamani) under two fertilization rates: maintenance (50, 50, 20, and 3.2 kg ha⁻¹ year⁻¹ of N, K, S, and micronutrients, respectively) and enhanced (150, 150, 40, and 6.4 kg ha⁻¹ year⁻¹, respectively). The Zuri cultivar showed a higher daily forage accumulation rate and greater forage leaf mass compared with the other cultivars. In addition, the Zuri and Paredão cultivars achieved the highest FY, reaching 12.80 and 12.10 Mg ha⁻¹, respectively. The Tamani cultivar exhibited a lower neutral detergent fiber concentration and a higher total digestible nutrient concentration, indicating its potential for systems that prioritize higher forage nutritive value. Zuri and Paredão maximize forage yield in crop succession systems, while enhanced fertilization increases yield by 15%, with adoption dependent on economic feasibility. Full article

Background: Caryocar brasiliense Camb. Caryocaraceae is a typical tree from the Brazilian Cerrado with commercial importance due to its edible fruit, known as pequi. This native plant holds significant economic value and is a key candidate for cropping systems. Rich in phytochemicals, such as phenolics, flavonoids, and terpenoids, it has shown notable health benefits. Methods: Considering the importance of terpenes and their biological properties, and based on the first draft genome of C. brasiliense, this study aimed to identify putative terpene synthase genes and classify them into the phylogenetic subfamilies previously identified across all plant lineages. The presence of terpenes was also verified in samples of the outer portion of the fruit by solid-phase microextraction gas chromatography mass-spectrometry. Results: Analysis of genome completeness showed that over 90% of genes were identified despite a highly fragmented assembly, with 71% containing complete gene sequences. Twenty-two genes were retained as putative terpene synthase genes considering their homology with the terpene synthase Hidden Markov Model (HMM) profiles in the Pfam-A database. Ten sequences with a minimum length of 298 amino acids were used for phylogenetic inference. In the resulting phylogenetic tree, C. brasiliense terpene synthase genes clustered within the different previously identified Angiosperm clades and allowed us to classify each gene into different phylogenetic subfamilies: six genes belonged to the h/d/a/b/g, three to the c, and one to the e/f. The headspace solid-phase microextraction technique, in conjunction with gas chromatography mass-spectrometry, has allowed for the identification of eleven chemical compounds, including a terpene. Conclusions: This initial identification of putative terpene synthase genes in pequi, together with the chemical analysis of the outer fruits, lays the groundwork for future studies aimed at optimizing terpene biosynthesis for both biological and commercial applications. Full article