Rio Verde de Mato Grosso, Brazil
Rio Verde de Mato Grosso, Brazil

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Silva R.V.,Federal University of Viçosa | Silva R.V.,Instituto Federal Goiano IF Goiano | de Lima Oliveira R.D.,Federal University of Viçosa | da Silva Ferreira P.,Federal University of Viçosa | And 2 more authors.
Bragantia | Year: 2015

Considering that the root-knot nematode Meloidogyne exigua has caused great yield losses to cofee production in Brazil, this study aimed to determine whether the penetration and the reproduction events of this nematode on the roots of plants from two cofee cultivars with diferent levels of basal resistance to this nematode could be afected by silicon (Si). Cofee plants from the cultivars Catuaí and IAPAR 59, which are susceptible and resistant, respectively, to M. exigua, were grown in pots containing Si-deficient soil that was amended with either calcium silicate (+Si) or calcium carbonate (–Si). The Si concentration on the root tissue significantly increased by 159 and 97% for the +Si plants from the cultivars Catuaí and IAPAR 59, respectively, compared to the –Si plants of these cultivars. The population of M. exigua, the number of galls and the number of eggs were significantly reduced on the roots of the +Si plants of the cultivars Catuaí and IAPAR 59 compared to the –Si plants of these cultivars. It was concluded that the development and reproduction events of M. exigua were negatively impacted on the roots of cofee plants supplied with Si. © 2015, Instituto Agronomico. All rights reserved.


Marangoni R.E.,Instituto Federal Goiano IF Goiano | Jakelaitis A.,IF Goiano | Tavares C.J.,Instituto Federal Goiano IF Goiano | Rezende B.P.M.,Instituto Federal Goiano IF Goiano | And 2 more authors.
Planta Daninha | Year: 2013

This study aimed to evaluate the effects of weed interference on soybean cultivars at two sowing times in Urutaí, GO. The treatments were arranged in split-plots, and the sowing times (November 16 and December 16, 2009) were allocated in the plots; the soybean cultivars [BRSGO Amaralina, P98C81 (semi-late cycle) BRSGO Raissa, BRSGO Indiara, P98Y11 (median cycle) and BRSGO 7560, BRSGO Caiapônia, Emgopa 302RR (early cycle)] were allocated in the split-plots; and the coexistence or non coexistence of soybean cultivars with weeds, throughout their cycle, was allocated in the split-plots. Non coexistence was established by manual weeding. The experiment was arranged in randomized blocks with four replications. It was verified that the optimal time for sowing soybeans was the month of November, and that under these conditions, the cultivars had higher competitive ability against weeds. Late sowing affected the cycle, development, and yield of the soybean cultivars; this effect was greater under the influence of the weed community.


Moreto J.A.,Instituto Federal Goiano IF Goiano | Junior F.A.P.,Empresa Brasileira de Aeronautica EMBRAER S.A | MacIel C.I.S.,University of Sao Paulo | Bonazzi L.H.C.,University of Sao Paulo | And 3 more authors.
Materials Research | Year: 2015

The aim of this study was to evaluate and compare the effect of low temperature and saline environment on the fatigue crack growth behavior of the AA7050-T7451 Al alloy and the recently developed AA2050-T Al-Cu-Li alloy. Fatigue at room and low temperature and corrosion-fatigue tests were carried out using an applied stress ratio (R) of 0.1, 15 Hz frequency (air at RT and-54 C) and 1 Hz frequency (seawater fog) using a sinusoidal wave form. In the near-threshold region, in air and at RT it was found a ?Kth = 2.9 MPa.m1/2 for AA2050-T84, in saline environment this value increased to ?Kth = 4.9 MPa.m1/2, due to closure effect through wedge effect by the corrosion products. At the beginning of the Paris-Erdogan region, the crack closure effect was not present for the AA7050-T7451, but persisted for the AA2050 Al-li alloy. It was observed that both alloys were equally affected by temperature reduction. When the saline environment is considered it was observed that the AA7050-T7451 presents lower m value (2.6) than the one for AA2050-T84 (3.4), meaning a lower FCG rate variation with ?K, however it presented the highest C value, as a consequence the worst FCG behavior.


Valdisser P.A.M.R.,Laboratorio Of Biotecnologia | Pappas G.J.,University of Brasilia | de Menezes I.P.P.,Instituto Federal Goiano IF Goiano | Muller B.S.F.,University of Brasilia | And 6 more authors.
Molecular Genetics and Genomics | Year: 2016

Researchers have made great advances into the development and application of genomic approaches for common beans, creating opportunities to driving more real and applicable strategies for sustainable management of the genetic resource towards plant breeding. This work provides useful polymorphic single-nucleotide polymorphisms (SNPs) for high-throughput common bean genotyping developed by RAD (restriction site-associated DNA) sequencing. The RAD tags were generated from DNA pooled from 12 common bean genotypes, including breeding lines of different gene pools and market classes. The aligned sequences identified 23,748 putative RAD-SNPs, of which 3357 were adequate for genotyping; 1032 RAD-SNPs with the highest ADT (assay design tool) score are presented in this article. The RAD-SNPs were structurally annotated in different coding (47.00 %) and non-coding (53.00 %) sequence components of genes. A subset of 384 RAD-SNPs with broad genome distribution was used to genotype a diverse panel of 95 common bean germplasms and revealed a successful amplification rate of 96.6 %, showing 73 % of polymorphic SNPs within the Andean group and 83 % in the Mesoamerican group. A slightly increased He (0.161, n = 21) value was estimated for the Andean gene pool, compared to the Mesoamerican group (0.156, n = 74). For the linkage disequilibrium (LD) analysis, from a group of 580 SNPs (289 RAD-SNPs and 291 BARC-SNPs) genotyped for the same set of genotypes, 70.2 % were in LD, decreasing to 0.10 %in the Andean group and 0.77 % in the Mesoamerican group. Haplotype patterns spanning 310 Mb of the genome (60 %) were characterized in samples from different origins. However, the haplotype frameworks were under-represented for the Andean (7.85 %) and Mesoamerican (5.55 %) gene pools separately. In conclusion, RAD sequencing allowed the discovery of hundreds of useful SNPs for broad genetic analysis of common bean germplasm. From now, this approach provides an excellent panel of molecular tools for whole genome analysis, allowing integrating and better exploring the common bean breeding practices. © 2016 Springer-Verlag Berlin Heidelberg


PubMed | Laboratorio Of Biotecnologia, Federal University of Goais, Instituto Federal Goiano IF Goiano and University of Brasilia
Type: Journal Article | Journal: Molecular genetics and genomics : MGG | Year: 2016

Researchers have made great advances into the development and application of genomic approaches for common beans, creating opportunities to driving more real and applicable strategies for sustainable management of the genetic resource towards plant breeding. This work provides useful polymorphic single-nucleotide polymorphisms (SNPs) for high-throughput common bean genotyping developed by RAD (restriction site-associated DNA) sequencing. The RAD tags were generated from DNA pooled from 12 common bean genotypes, including breeding lines of different gene pools and market classes. The aligned sequences identified 23,748 putative RAD-SNPs, of which 3357 were adequate for genotyping; 1032 RAD-SNPs with the highest ADT (assay design tool) score are presented in this article. The RAD-SNPs were structurally annotated in different coding (47.00%) and non-coding (53.00%) sequence components of genes. A subset of 384 RAD-SNPs with broad genome distribution was used to genotype a diverse panel of 95 common bean germplasms and revealed a successful amplification rate of 96.6%, showing 73% of polymorphic SNPs within the Andean group and 83% in the Mesoamerican group. A slightly increased He (0.161, n=21) value was estimated for the Andean gene pool, compared to the Mesoamerican group (0.156, n=74). For the linkage disequilibrium (LD) analysis, from a group of 580 SNPs (289 RAD-SNPs and 291 BARC-SNPs) genotyped for the same set of genotypes, 70.2% were in LD, decreasing to 0.10%in the Andean group and 0.77% in the Mesoamerican group. Haplotype patterns spanning 310Mb of the genome (60%) were characterized in samples from different origins. However, the haplotype frameworks were under-represented for the Andean (7.85%) and Mesoamerican (5.55%) gene pools separately. In conclusion, RAD sequencing allowed the discovery of hundreds of useful SNPs for broad genetic analysis of common bean germplasm. From now, this approach provides an excellent panel of molecular tools for whole genome analysis, allowing integrating and better exploring the common bean breeding practices.


Rossi C.Q.,Federal Rural University of Rio de Janeiro | Pereira M.G.,Federal Rural University of Rio de Janeiro | Loss A.,Federal University of Santa Catarina | Gazolla P.R.,AGRODEFESA | And 2 more authors.
Agriculture, Ecosystems and Environment | Year: 2013

Pre-harvest sugarcane straw burning affects the dynamics of soil chemistry and δ13C and δ15N abundance, but further studies are needed to understand the long-term effects of this practice on the degradation of chemical attributes of soil and sugarcane production. The present study evaluates chemical modifications of soil and natural δ13C and δ15N abundance in sugarcane crops managed with pre-harvest straw burning for 1, 5, 10 and 20 years. For comparison purposes, soil covered with natural Cerrado vegetation and forage grass (pasture) were also evaluated. After chemical characterization of the areas studied, according to Embrapa (1997) total organic carbon (TOC), bulk density (Bd) and natural δ15N and δ13C abundance were determined in soil samples, and carbon stocks calculated from TOC values. In general, the pasture area had the highest δ13C and δ15N content, the Cerrado vegetation area had the lowest values for these elements and sugarcane crops exhibited intermediary levels. Areas subjected to sugarcane field burning for a shorter period had the highest Ca and Mg and lowest P and K content. Sugarcane crops managed with straw burning for 1 and 5 years produced lower carbon stocks in the top soil layer (0-10cm) than sugarcane crops with 10 and 20 years, pasture and Cerrado areas. The replacement of natural Cerrado vegetation by sugarcane crops changed δ13C profile, likely because sugarcane is a C4 plant, which has a specific carbon accumulation pattern. Areas cropped with sugarcane for 1, 10 and 20 years and subjected to different types of soil use after replacement of the original Cerrado vegetation had the highest δ15N values, indicating accelerated mineralization of soil organic matter. © 2013 Elsevier B.V.


Costa R.R.G.F.,State University of Goiás | Quirino G.S.F.,State University of Goiás | Naves D.C.F.,State University of Goiás | Santos C.B.,Instituto Federal Goiano IF Goiano | Rocha A.F.S.,State University of Goiás
Pesquisa Agropecuaria Tropical | Year: 2015

The misuse of fertilizers has become a growing concern in terms of agricultural and environmental sustainability. One alternative to reduce the impact of chemical fertilizers is the use of inoculants containing nitrogen-fixing and plant growth promoting bacteria. This study aimed at evaluating the effects of an inoculant with Azospirillum brasilense on the growth and yield of secondharvest maize. The experimental design was randomized blocks with three replications, in a 3 × 5 factorial scheme. The treatments consisted of three inoculation methods (control without inoculation, seed inoculation and leaf-sprayed inoculation at the V4 stage) and five cover N-fertilization doses (0%, 25%, 50%, 75% and 100%, with the 100% dose corresponding to 50 kg ha-1 of N as urea). Inoculated plants showed a greater growth for height (9.5% and 16%), stem dry biomass (49% and 6.75%) and root dry biomass (123% and 97%), respectively for seed inoculation and spraying, as well as increases in ear size (8%), chlorophyll content (4%), 1,000-grain weight (12%) and grain yield (29%), when compared to non-inoculated plants. The effects of N doses were only significant for 1,000-grain weight and grain yield (kg ha-1), with seed inoculation providing a higher yield for second-harvest maize. © 2015, Universidade Federal De Goias (UFG). All rights reserved.


Borges L.M.F.,Federal University of Goais | Duarte S.C.,Federal University of Goais | Louly C.C.B.,Instituto Federal Goiano IF Goiano
Ciencia Rural | Year: 2015

Although Rhipicephalus microplus mainly parasitizes bovines, different breeds can have variable parasite burdens, with indian breeds being less susceptible to tick infestation than european breeds. These ticks use pasture questing to seek out their hosts in the open spaces of their grassland habitats. Using an olfactometer bioassay, where the larva could express questing, the authors aimed to answer whether R. microplus exhibit different behaviors depending on the bovine breed. Sixteen larvae were individually exposed to the odors of five holstein friesian cattle, five nelore cattle, hexane (negative control) and 2-nitrophenol (positive control). The highest questing responses were observed to 2-nitrophenol and holstein odors. The lowest response was observed to the solvent and was statistically similar to nelore odors. It is possible to conclude that R. microplus express different questing behaviors depending on the odor of the breed perceived. This behavior can help R. microplus to avoid parasitizing nelore bovines and is biologically advantageous for the tick because it is known that ticks that feed on this host have impaired development. © 2015, Universidade Federal de Santa Maria. All rights reserved.


Malafaia G.,Instituto Federal Goiano IF Goiano | de Lima Rodrigues A.S.,Instituto Federal Goiano IF Goiano | de Araujo F.G.,Instituto Federal Goiano IF Goiano | Leandro W.M.,Federal University of Goais
Revista Ambiente e Agua | Year: 2015

This study evaluated the parameters of the growth of corn plants (Zea mays L.) grown in pots containing soil plus tannery sludge vermicompost and irrigated with household wastewater. The arrangement of treatments consisted of a factorial 2×6 (two types of irrigation and six fertilization treatments) in a completely randomized design (CRD) with five repetitions. The height of the plants and the diameter of the stems were evaluated bi-weekly. The results indicated that both the wastewater and the tannery sludge vermicompost are good sources of nutrients for the plants, promoting their growth. We conclude, therefore, that wastewater from households and tannery sludge vermicompost can be considered an agricultural waste of interest for the corn crop. © 2015, Institute for Environmental Research in Hydrographic Basins (IPABHi). All rights reserved.


Resende O.,Instituto Federal Goiano IF Goiano | Almeida D.P.,Instituto Federal Goiano IF Goiano | Costa L.M.,Instituto Federal Goiano IF Goiano | Mendes U.C.,Instituto Federal Goiano IF Goiano | de Fatima Sales J.,Instituto Federal Goiano IF Goiano
Ciencia e Tecnologia de Alimentos | Year: 2012

This study analyzed the drying process and the seed quality of adzuki beans (Vigna angularis). Grains of adzuki beans, with moisture content of 1.14 (decimal dry basis) at harvest and dried until the moisture content of 0.11 (decimal dry basis.) were used. Drying was done in an experimental drier maintened at controlled temperatures of 30, 40, 50, 60, and 70 °C and relative humidity of 52.0, 28.0, 19.1, 13.1, and 6.8%, respectively. Physiological and technological seed quality was evaluated using the germination test, Index of Germination Velocity (IGV), electrical conductivity, and water absorption, respectively. Under the conditions tested in the present study, it can be concluded that drying time for adzuki beans decreases with the higher air temperatures of 60 and 70 °C, and it affected the physiological and technological seed quality. Thus, to avoid compromising adzuki seeds quality, it is recommended to promote its drying up to 50 °C.

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