Heleno S.A.,University of Minho |
Ferreira R.C.,IFSULDEMINAS |
Queiroz M.-J.R.P.,University of Minho
Food Bioscience | Year: 2015
Mushrooms contain a multitude of biomolecules with nutritional and/or biological activity. Among the bioactive molecules, phenolic compounds and tocopherols are the most responsible for their antioxidant activity. In the present work, Boletus edulis, Lentinus edodes and Xerocomus badius, three edible mushroom species originated from Poland, were analyzed for their chemical composition and antioxidant activity. Carbohydrates were the most abundant macronutrients, followed by proteins and ash. Fructose, mannitol and trehalose were the prevalent sugars, but glucose was only found in B. edulis. Polyunsaturated fatty acids predominated over mono and saturated fatty acids. Palmitic, oleic and linoleic acids were abundant in the three samples. α- and β- Tocopherols were quantified in all the samples, but γ-tocopherol was only identified in X. badius. Oxalic and fumaric acids were quantified in the three samples; quinic acid was only present in L. edodes, and malic and citric acids were only found in X. badius. p-Hydroxybenzoic, protocatechuic and cinnamic acids were quantified in all the species, while p-coumaric acid was only found in B. edulis. This species and X. badius revealed the highest antioxidant properties, being B. edulis more effective in radicals scavenging activity and reducing power, and X. badius in lipid peroxidation inhibition, which is related with the highest amounts in phenolic compounds and tocopherols, respectively. © 2015 Elsevier Ltd. All rights reserved.
Carvalho S.J.P.,IFSULDEMINAS |
Goncalves Netto A.,University of Sao Paulo |
Nicolai M.,AGROCON Assessoria Agronomica Ltda |
Cavenaghi A.L.,Centro Universitario Of Varzea Grande |
And 2 more authors.
Planta Daninha | Year: 2015
The recent introduction of Palmer amaranth (Amaranthus palmeri) in Brazilian agricultural areas may promote several changes on weed management, especially in no-till systems and in glyphosate-resistant crops, since glyphosate-resistant biotypes of A. palmeri have been frequently selected in other countries. Therefore, this research was developed in order to evaluate the glyphosate susceptibility of a Palmer amaranth biotype recently identified in the State of Mato Grosso, Brazil. For this purpose, glyphosate susceptibility of three Amaranthus biotypes was compared: A. hybridus var. patulus, collected in the State of Rio Grande do Sul - Brazil; A. hybridus var. patulus, collected in the State of São Paulo - Brazil; and A. palmeri, collected in the State of Mato Grosso - Brazil. Dose-response curves were generated for all biotypes, considering eight rates of glyphosate and six replicates. All the experiments were repeated twice. Both A. hybridus biotypes were satisfactorily controlled by glyphosate, demanding rates equal to or lower than 541.15 g a.e. ha-1 for 80% control (LD80). The A. palmeri biotype was not controlled by glyphosate in any of the assessments and required rates greater than 4,500 g a.e. ha-1 to reach LD80, which are economically and environmentally unacceptable. Comparison of the Brazilian A. palmeri biotype to the A. hybridus biotypes, as well as, to the results available in scientific international literature, led to the conclusion that the Brazilian Palmer amaranth biotype is resistant to glyphosate. © 2015 Sociedade Brasileira da Ciencia das Plantas Daninha. All rights reserved.
Carvalho S.J.P.,Instituto Federal Of Educacao |
Machado E.C.R.,IFSULDEMINAS |
Marques B.S.,IFSULDEMINAS |
Silva A.P.P.,IFSULDEMINAS |
And 2 more authors.
Planta Daninha | Year: 2012
This work was carried out to evaluate catalase relative activity of ragweed (Parthenium hysterophorus) aqueous extract, as well as to compare it with catalase activity of other weed species. It consisted of three phases, involving method standardization, comparison of the catalase relative activity in Asteraceae family plants and that of ragweed catalase activity with the following 11 weed species: Euphorbia heterophylla, Alternanthera tenella, Cenchrus echinatus, Panicum maximum, Amaranthus viridis, Ipomoea hederifolia, Galinsoga parviflora, Bidens pilosa, Sonchus oleraceus, Cyperus rotundus and Commelina benghalensis. Reaction of ragweed aqueous extract with hydrogen peroxide had increasing linear response regarding plant extract concentration. In all phases, catalase relative activity of ragweed extract was superior to catalase activity of the other weed species. Data obtained in these phases allowed to conclude that higher relative activity observed for ragweed catalase significantly contributes to the tolerance of this species to paraquat. This higher activity might be due to higher enzymatic concentration in ragweed cells or to higher intrinsic enzymatic activity (enzyme-substrate affinity).Therefore, further studies are necessary to support this conclusion.
Machado F.S.,Federal University of Lavras |
Fontes M.A.L.,Federal University of Lavras |
dos Santos R.M.,Federal University of Lavras |
Garcia P.O.,IFSuldeMinas |
Farrapo C.L.,Federal University of Lavras
Biodiversity and Conservation | Year: 2016
Descriptions of biodiversity from ecotonal regions are lacking. This knowledge gap results from the difficulty of identifying elements from both biomes/domains and the advancement of human activities that generate small forest fragments. Here it is shown that small forest fragments in an ecotonal region have species richness and abundance in line with other inventories in preserved and non-preserved areas as well as composition and structure differentiated by the presence of species from both domains. The beta diversity among fragments reflects a high turnover supported by the formation of centers of dominance among the most abundant species. Finally, functional diversity favors the group that is tolerant of a wide range of environmental variables and is associated with faunal components. The results indicate that these fragments are important from a conservation standpoint because of the intersection of elements from threatened biomes, which must be managed coherently. However, Brazilian legislation is constantly modified and still allows anthropogenic changes that prevent the persistence of species. © 2016, Springer Science+Business Media Dordrecht.
Miranda J.M.,Unifenas |
Reinato R.A.O.,Ifsuldeminas |
da Silva A.B.,Unifenas
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014
The objective of this work was to create a practical and effective mathematical model for the early prediction of crops based on some phenological attributes of the plant: height, number of fruits in the 4th and 5th internodes of the plagiotropic branches, length in meters of the planted coffee row and diameter measured at the lower region of the coffee plants. The experiment was carried out in the coffee plantations of IFSULDEMINAS-campus Machado-where the productivity of four cultivars of different sizes were analysed during the 2010-2011 season: Catucaí, Mundo Novo, Ruby and Topaz. Each of these was an experimental unit, from which 10 plants were randomly chosen. Of these, 6 branches of each plant were sampled (three on the side of the rising sun, and three on the side of the sunset; two in the upper third, and two in the middle region, and two in the lower region of each plant). Data were collected at the end of February 2011. The model which considers the proportion of the coffee plant canopy in order to get closer to the real architecture of the plant was the most significant, with a coefficient of determination of 0.83.
Pereira W.R.,IFSULDEMINAS |
de Souza R.J.,Federal University of Lavras |
Yuri J.E.,Embrapa Semiarido |
Horticultura Brasileira | Year: 2013
We evaluated strawberry yield in different planting dates. The experiment was carried out in Bom Repouso, southern Minas Gerais state, Brazil. A randomized block design with five replications in a factorial design was used, comprising four cultivars (Aromas, Camarosa, Festival and Oso Grande) and four planting dates (May, June, July and August), in a spacing of 35x35 cm. Planting on May was the best option, except for 'Oso Grande' with no difference among May, June and July, the result being inferior in August. Regarding the cultivars, 'Aromas' was among the most productive in May and August, while 'Oso Grande' kept its productivity throughout the studied seasons. The cultivars presented the same characteristic for marketable fruits number and mass. There was no interaction between number and mass of no marketable fruits, in which 'Aromas' and 'Oso Grande' presented inferior results, considered advantageous.'Oso Grande' produced the highest number of marketable fruits and was considered, in this study, the cultivar most adapted for the planting seasons in Bom Repouso.
Lima R.S.O.,Graduados em Engineering Agronomica pelo IFSULDEMINAS |
Machado E.C.R.,Graduados em Engineering Agronomica pelo IFSULDEMINAS |
Silva A.P.P.,Graduados em Engineering Agronomica pelo IFSULDEMINAS |
Marques B.S.,Graduados em Engineering Agronomica pelo IFSULDEMINAS |
And 2 more authors.
Planta Daninha | Year: 2015
This work was carried out with the objective of elaborating mathematical models to predict growth and development of purple nutsedge (Cyperus rotundus) based on days or accumulated thermal units (growing degree days). Thus, two independent trials were developed, the first with a decreasing photoperiod (March to July) and the second with an increasing photoperiod (August to November). In each trial, ten assessments of plant growth and development were performed, quantifying total dry matter and the species phenology. After that, phenology was fit to first degree equations, considering individual trials or their grouping. In the same way, the total dry matter was fit to logistic-type models. In all regressions four temporal scales possibilities were assessed for the x axis: accumulated days or growing degree days (GDD) with base temperatures (Tb) of 10, 12 and 15 oC. For both photoperiod conditions, growth and development of purple nutsedge were adequately fit to prediction mathematical models based on accumulated thermal units, highlighting Tb = 12 oC. Considering GDD calculated with Tb = 12 oC, purple nutsedge phenology may be predicted by y = 0.113x, while species growth may be predicted by y = 37.678/(1+(x/509.353)-7.047). © 2015 Sociedade Brasileira da Ciencia das Plantas Daninha. All Rights Received.
Gaspar N.A.,IFSULDEMINAS |
Aparecido L.E.O.,São Paulo State University |
Rolim G.S.,São Paulo State University |
de Souza P.S.,IFSULDEMINAS |
Australian Journal of Crop Science | Year: 2015
Surface weather stations in agricultural areas are commonly managed non-professionally, usually in areas with more than one station. Climate is defined as the average meteorological conditions of a region, and knowledge of climate is essential for agricultural development. We have developed a program for the management of meteorological data from different automatic weather stations capable of estimating evapotranspiration, water-balance components, and crop yields. The software System for Water Balance (SYSWAB) was developed using Java as the programming language and MySQL as the database management system. The user can choose among 6 evapotranspiration models in the system, the water balance calculations followed the Thornthwaite and Mather (1955) model. The software calculates the potential and actual yield following the Doorenbos and Kassam (1979) method (FAO). SYSWAB was tested by estimating the evapotranspiration and actual yield for a coffee crop. The evapotranspiration ranged from 70 to 113 mm in the months with high temperatures and from 40 to 70 mm in months with lower temperatures. SYSWAB accurately estimated the yield. The observed and simulated yields did not differ significantly at p<0.01. The FAO model used was thus accurate, and the program algorithm was sound. The program can be downloaded free of charge at: http://comp.muz.ifsuldeminas.edu.br/downloads/ver/syswab-system-for-water-balance.
Pereira A.A.,IFSULDEMINAS |
Pereira J.A.A.,Federal University of Lavras |
Morelli F.,National Institute for Space Research |
Barros D.A.,IFSULDEMINAS |
And 2 more authors.
Cerne | Year: 2012
This work was conducted with the purpose of validating the hotspots utilized in fire monitoring. The burnt areas observed in six conservation units situated in north of the State of Minas Gerais were mapped in the period of September 3rd to October 5th, 2008, using semi-automatic segmentation of LandSat 5 TM images. A total of 190 burnt areas were mapped and the detections were verified using the satellites hotspots generated by the Brazilian National Space Research Institute - INPE. The burnt areas were also analyzed by size class in order to verify the hypothesis that the smallest areas are less liable to detection. The analysis of the hotspots distance to the limits of the burnt areas was done using buffers, with an increase of 1.00 km in every class, up to the limit of 9.00 km. Considering the investigated burnt areas, about 26.00% were detected, demonstrating limitations of the system to detect burnings smaller than 100.00 ha. In spite of that limitation, a great portion of the impacted area was detected, reaching a total of hits of about 71.00%. The results of location errors were considered satisfactory, considering the technical limitations of the spatial resolution of the utilized sensors. This information may subside the technological advancement of orbital monitoring.
Pinto L.V.A.,IFSULDEMINAS |
de Roma T.N.,IFSULDEMINAS |
Cerne | Year: 2012
Several factors are known to be responsible for the degradation of water quality in our Planet's spring sources. The goal of this study was to evaluate the impact of different anthropogenic activities on physico-chemical and biological properties of five spring water located in Inconfidentes, Minas Gerais State, Brazil. Analytical results have demonstrated that water source protected by native vegetation had the highest quality in terms of color, turbidity, biological oxygen demand (BOD5), total phosphate, nitrate, dissolved oxygen (DO), fecal coliforms and thermo-tolerant coliforms. On the other hand, the water quality was negatively impacted by the lack of adequate agricultural practices, such as the use of chemical inputs, the nonexistence of fenced livestock grazing areas and residential sewage system which are considered to be indispensable practices to minimize the environmental impact of anthropogenic activities and to protect human health.