Programa de Pós-graduação em Agronomia
URI Permanente desta comunidade
Navegar
Navegando Programa de Pós-graduação em Agronomia por Por tipo de Acesso "Acesso aberto"
Agora exibindo 1 - 12 de 12
Resultados por página
Opções de Ordenação
Item Efeitos de culturas de cobertura na qualidade física do solo sob plantio direto(Universidade Federal de Goiás, 2008-02-22) Andrade, Rui da Silva; Silveira, Pedro Marques da; Stone, Luís Fernando; http://lattes.cnpq.br/0233514913817700The objective of this study was to verify the suitability of S index in the diagnostic of physical quality of Cerrado soils and, based upon it, to determine the effect of cover crop mulches on physical quality of a Dystrophic Red Latosol (Oxisol) under no-tillage. A total of 2364 samples were selected from the soil data base of Embrapa Rice & Beans and Embrapa Cerrados, covering Cerrado soils from Mid-West, North, and Northeast regions of Brazil. Values of S index, defined as the slope of the soil water retention curve at its inflection point, obtained from these samples were correlated to soil bulk density, macroporosity, and total porosity, considering the following textural classes: very clayey, clayey, sandy clay, sandy clay loam, loam/sandy loam e loamy sand/sand. Based on review of literature, critical values were established for the physical attributes that separated, according to the texture, soils with good and poor structural quality and, based upon they, critical values were established for the S index. In order to study the effect of cover crop mulches on soil physical quality, an experiment was carried out under center pivot at Embrapa Rice & Beans, in Santo Antônio de Goiás, GO, in a randomized block design, with eight replications. The treatments consisted of eight cover crops: Brachiaria brizantha; corn associated with B. brizantha; pigeon pea; millet; Panicum maximum; sorghum; Stylosanthes guianensis; and Crotalaria juncea. The first seven crops had been cultivated in summer season since December 2001 and C. juncea since November 2003. In the winter season, after cover crop desiccation, irrigated common bean crop was implemented under no-tillage. In February 2006, soil organic matter content, some soil physical attributes, and soil physical quality measured by S index were determined. This index was highly correlated to the physical attributes, showing to be an adequate indicator of physical quality of Cerrado soils. The limit value of S = 0.045 showed to be adequate to separate soils with good structure and soils with the tendency to be degraded, while values of S ≤ 0,025 indicate physically degraded soils. Cover crops, specially grasses, favored soil aggregation at surface layer. Soil cultivation modified its structure in comparison to native forest, increasing bulk density and reducing macroporosity and total porosity, and hence, reducing soil physical quality. Among the cover crops, pigeon pea, C. juncea, and corn associated with B. brizantha were those that maintained soil surface layer with good physical quality.Item Efeito do estresse hídrico no metabolismo de gabirobeira(Universidade Federal de Goiás, 2012-03-21) Belo, Emiliane dos Santos; Silva, Samuel Mariano da; http://lattes.cnpq.br/4333570201713380; Neto, Antônio Paulino da Costa; Neto, Antônio Paulino da Costa; Assunção, Hildeu Ferreira da; Paiva, RenatoAs respostas das plantas ao déficit hídrico são complexas, envolvendo mudanças adaptativas e/ou efeitos deletérios. Os danos causados por estresses às plantas podem ser reversíveis ou irreversíveis. O objetivo deste trabalho foi avaliar a tolerância da gabirobeira (Campomanesia spp) ao estresse hídrico e hipoxia de raízes durante 18 dias. Avaliou-se o conteúdo de matéria fresca, seca, água, AST, sacarose, amido, proteínas bruta, insolúvel, solúvel e aminoácidos de folhas e raízes, além dos parâmetros de crescimento como TCR, TCA, TAL, diâmetro do colo, comprimento e área de raízes. As gabirobeiras sob estresse hídrico apresentaram redução no conteúdo de água, prejuízos na produção de biomassa de folhas e raízes, redução no conteúdo de AST, amido e no conteúdo de aminoácidos. Sob hipoxia, exibiram prejuízos na alocação de fotossintatos da parte aérea para as raízes, e por isso armazenam grandes quantidades de amido, os maiores prejuízos ocorreram em raízes. As estratégias de sobrevivência ao estresse hídrico incluem a remobilização de carboidratos solúveis e de reserva da parte aérea para as raízes permitindo assim que as gabirobeiras escapassem da seca. Sob hipoxia o potencial hídrico das folhas foi sustentado com carboidratos solúveis oriundos da remobilização do amido, provavelmente também houve síntese e degradação de polipeptídeos e enzimas em raízes devido a mudança do metabolismo aeróbio para anaeróbio.Item Caracterização da estrutura genética de populações de Caryocar brasiliense Camb. no estado de Goiás utilizando marcadores moleculares microssatélites(Universidade Federal de Goiás, 2005-08-25) Chaves, Sivany Rodrigues; Sibov, Sérgio Tadeu; http://lattes.cnpq.br/4627553641870284; Sibov, Sérgio Tadeu; Cruz, Aparecido Divino da; Chaves, Lázaro JoséThe species Caryocar brasiliense Camb. (pequizeiro) is a common tree fruitful in the Brazilian savannah (Cerrado) with great economic and social potential. The objective of this study goals the increase of information for an efficient breeding program for specie domestication and conservation. Eleven natural populations of “pequizeiro”, 30 individuals each, was sampled on five different regions of Goiás state. The genetics structure of these natural populations was analyzed based on variability at eight microsatellite loci in about 330 individuals. The number of alleles per locus it varied of 22 to 32 (mean = 28). The waited and observed heterozigosity varied of 0,843 to 0,920 and 0,546 to 0,758, respectively. Measures of genetic differentiation indicated significant differences between most populations (FST = 0,064 and RST = 0,439). RST values among samples were high and much higher than FST indicating a divergence between the model that consider alleles to be identical by descent, and the model of identity by state in these populations. Estimated number of migrants was high, Nm = 3,63 (mean), and the existence of private alleles indicated reduced gene flow and a consequently possible damage to the metapopulations structure. Significant correlation was not found between geographical distance and measure of genetic divergence, suggesting the intense gene flow in the past that joined the populations that are separated today.Item Detecção de estradas não pavimentadas com o uso de imagens orbitais de média resolução espacial.(Universidade Federal de Goiás, 2008-08-29) Fernandes, Angelo Florentino; Griebeler, Nori Paulo; http://lattes.cnpq.br/2953067359172793; Griebeler, Nori Paulo; http://lattes.cnpq.br/2953067359172793; Jardim, Carlos Henrique; http://lattes.cnpq.br/2169892960432979; Silva, Valtercides Cavalcante da; http://lattes.cnpq.br/6217069137951777Unpaved roads are essential for the municipal districts, mainly for those that have its economy based on the agricultural. However, not always the public power of these municipal districts has control on the amount and characteristics of the existent highways. These information are essential for the organizes of the net and maintenance of the highways of the municipal district, which are usually built without approaches of engineering that it increases the risk of degradation of those highways, what happen basic. It is of fundamental importance that the municipal district has it controls so much about the amount of not paved roads, as on the problems that eventually appear and they need solution. The present work had for objective to verify the adequate of the use of images of medium space resolution for identification of the mesh of not paved highways and recognition of features originated erosive of these. The work was accomplished tends as study object the microbasing of the river Chaves, in the municipal district of Morrinhos, GO. For the accomplishment of the work got up referring field data to not paved highways and erosions to its margins, using a receiving GPS. Images of sensor CCD of the satellite were used CBERS, referring to the months of April and September of 2007, and the software Spring, of the National Institute of Space Researches (INPE). In the study made use of the bands 2, 3 and 4, referring to the areas of the green, red and infra-red close of the spectrum electromagnetic. Vectorial data of the studied area obtained SIEG close to also used. The images were spatial coordinates, being defined the area of the study, being these analyzed band the band, by means of colored compositions. They were also accomplished analyses using supervised classification and filtrated for it enhances of borders. The obtained results showed that, the best form of extraction of that feature type is to manual and that, highways of reduced traverse section and of low volume of traffic they are not recognition passives, as well as features erosive of small load, in the bed, borders or in marginal areas to these. The artifices of digital processing with the use of filters and supervised classification didn't supply satisfactory results for the identification of those features. It was also verified that the production of map of erosion risk with the available scale for the place of the study, didn't present correlation adapted with the features lifted up erosive to field. It is concluded like this, that the use of images of medium space resolution for extraction of highways should be accompanied of field maps being able to not, however, to serve as support for neighborhood studies to these features.Item Desempenho agronômico da soja, fertilidade e dinâmica da matéria orgânica em solos sob aplicação de biochar no cerrado brasileiro(Universidade Federal de Goiás, 2014-05-23) Lima, Larissa Borges de; Petter, Fabiano André; Leandro, Wilson Mozena; http://lattes.cnpq.br/9052207260053937; Leandro, Wilson Mozena; Petter, Fabiano André; Santos, Glênio Guimarães; Borges, Jácomo Divino; Fernandes, Kátia FláviaThe objective of this work was to verify the long-term effect of biochar application on soil chemical properties and the development and soybean yield and carbon pools in a Oxisol (Experiment I) and Haplic Plinthosol (Experiment II) in the cerrado biome. Both experiments were conducted under field conditions in Nova Xavantina-MT . Settled experiments in a randomized block design, consisting of the combination of levels of the fertilizer (NPK) and doses of biochar. For evaluation of soil fertility soil samples were collected at 0-20 cm and analyzed the following attributes: pH, Ca, Mg, H+Al, P, K, and organic matter (OM). Agronomic variables were: height and dry matter of V4 and R1 and productivity. For evaluations in carbon pools contents were determined and total organic carbon (TOC) and nitrogen (TN), the concentrations of C in fractions fulvic acids (FA) , humic acids (HA) and humin (HU) , and , humification index (HI) . In general , there was synergy between the effect of mineral fertilization and application of biochar on soil chemical over the four years after the application attributes. As the aromatic structures are oxidized biochar notes positive effect on the contents of OM. The productivity was significantly increased mainly due to the application of 16 Mg ha-1 of biochar on 1st 3rd and 4th year , with an equation with quadratic behavior . In the 7th and 8th grade direct effect of biochar was reduced with low variation of grain yield. An increase in TOC stocks and aromatic contents with increasing carbon biochar application, showing that Walkley-black method is not effective for the determination of TOC in soils under application of biochar. There was a reduction in C-AF and C-AH with the application of biochar , more evident effect in the presence of NPK . The C-HU increased significantly with increasing doses of biochar. High doses of biochar (>16 Mg ha-1) provide increased IH. In both experiments I and II, biochar contributes to increasing C more stable OM of soil fraction is humin , which is desirable from an environmental standpoint and fertility.Item Caracterização fenotípica de acessos crioulos de Phaseolus vulgaris L. do tipo carioca baseada em análise multivariada(Universidade Federal de Goiás, 2010-08-31) Moçambique, Pedro Antônio; Oliveira, Jaison Pereira de; Costa, Joaquim Geraldo Cáprio da; Carneiro, Monalisa Sampaio; http://lattes.cnpq.br/2696490871291334; Duarte, João Batista; Chaves , Lázaro José; Burle, Marília Lobo; Antunes, Irajá Ferreira; Carneiro, Monalisa SampaioCommon beans (Phaseolus vulgaris L.) are widely cropped in Brazil, the largest world consumer. P. Vulgaris species is an important source of proteins in the human diet in developing countries in tropical and sub tropical regions, especially in the Americas and West Africa. To know the genetic diversity among commercial and Creole cultivars is very useful to breeders because it allows an adequate organization of the genetic resources and a better exploitation of the available genetic diversity. The objective of this work was to identify the genetic diversity among and into Carioca type common bean accesses stored in the Active Germplasm Bank at Embrapa Arroz e Feijão. The experimental design was a completely randomized bloc with three replicates and carried out at the same institution in the municipality of Santo Antônio de Goiás with the following geographical coordinates: 16.30´S; 49.17´W at 814 m altitude. The evaluation was performed based on fifteen morphoagronomic qualitative descriptors and fifteen quantitative descriptors as well. Nine out of fifteen descriptors were uniform in all accesses. The quantitative descriptors were analyzed using canonical variate analysis; the agglomerative clustering method of Ward, and the univariate variance analysis associated with the Tukey test to evaluate the effect of clustering on the variables and to compare the means of the groups among them. Through the canonical variate analysis it was possible to discard three variables with little contribution to the total phonotypical variability among the accesses. Taking in account the twelve variables left, it was necessary to consider the first five canonical variables to explain 68% of the total variance. Even though the dispersion plot of the accesses related to the two first canonical variables (57%) evidenced phonotypical variability in the accesses studied. Variables flowering days, number of locules per pods and pod beak length were considered the most discriminatory. Accesses CF870015 and CF 830128 were identified as the most diverging between themselves. Through cluster analysis, using the fifteen quantitative descriptors, six similar groups were established. Observing the average of the phenotypic characteristics of each group and the dispersion of the accessions, it was observed concordance between the canonical variate analysis and clustering. Based on the analysis of variance of the quantitative descriptors, the variables leaf width, number of pods per plant, pod beak length and number of locules per pods indicate non significant difference, while the other variables presented highly significant differences at the 5% level.Item Nutrição do tomateiro e sua influência no desenvolvimento de ninfas de Bemisia tabaci (GENN.) biótipo B(Universidade Federal de Goiás, 2012-02-17) Oliveira, Marcos Fernandes; Veloso, Valquiria da Rocha Santos; Fernandes, Paulo Marçal; http://lattes.cnpq.br/9497281141847296; Oliveira Jr, Juarez Patrício de; Nascimento, Abadia dos Reis; Peixoto, Márcio Fernandes; Filho, Miguel Michereff; Fernandes, Paulo MarçalThe objective of this work was to evaluate the effect of tomato plants nutrition on the development of B. tabaci (Genn) biotype B. The experiments were carried out in a completely randomized design in a greenhouse at ambient temperature, moisture and photoperiod, at the Escola de Agronomia e Engenharia de Alimentos (EA/UFG), Goiânia, Goiás, Brasil. Each treatment had eight replicates with one plant per pot. Treatments used to test the various contents of earthworm manure were the association of (soil + earthworm manure: 100% + 0%; 80% + 20%; 60% + 40%; 40% + 60%; 20% + 80%, and 0% + 100%. Treatments used to test the N/K rates were: 1/1; 2/1; 4/1; 8/1; 1/2; 1/4, and 1/8. To test the different sources of organic nitrogen, the following treatments were used: chicken manure; earthworm manure; cotton meal; castor beans meal, as well as the mixtures (chicken manure + earthworm manure + cotton meal + castor beans meal. To test the various sources of mineral nitrogen, the following treatments were used: urea, ammonium sulfate; LL®; calcium nitrate and a mixture of fertilizers (urea + ammonium sulfate + Nitro LL® + calcium nitrate). The infestations were performed 40 days after plugs transplant, by releasing 50 couples of B. tabaci biotype B into screen bags, placed in the third or fourth leaf of each plant. One day after infestation 300 eggs were counted and marked on each infested leaf. Ten days after infestation the amount of unviable eggs were evaluated and first ínstar nymphs marked. The analysis of nymphs development was performed 21 days after infestation in the experiment used to test different sources of nitrogen and N/K rates; and, at 30 days after infestation in the experiments used to test the different levels of earthworm manure. B. tabaci nymphs biotype B showed elongation and mortality in that phase, probably due to antibiosis developed by tomato plants: cultivated in earthworm manure only (egg-adult viability 30% and 44% population reduction); fertilization according to N/K 1/8 rate (egg-adult viability 13% and 69% population reduction); fertilized with chicken manure (30% egg-adult viability and 41% population reduction); and, fertilized with calcium nitrate (25% egg-adult viability and 57% population reduction).Item Isolados de rizóbios capturados por genótipos silvestres de feijoeiro: obtenção, morfologia e uso de fontes de carbono(Universidade Federal de Goiás, 2013-02-28) Sampaio, Fernanda Bueno; Ferreira, Enderson Petrônio de Brito; Brasil, Eliana Paula Fernandes; http://lattes.cnpq.br/7324619074753727; Leandro, Wilson Mozena; Ferreira, Luciana Domingues Bittencourt; Brasil, Eliana Paula FernandesThe bean is a legume widespread throughout the country and an important source of protein in human food. Inoculation of legumes with rhizobia able to perform biological nitrogen fixation (BNF), has been widely discussed, based on studies indicating its feasibility for use in agriculture, since the BNF decreases partly environmental liabilities generated by high consumption of nitrogen fertilizer. The use of wild bean genotypes seeks greater diversity of rhizobia for isolation and study of the ability of BNF, which may result in greater specificity for symbiotic bean crop. The objective was to obtain and characterize the morphology and on the use of carbon sources captured populations of rhizobia in wild bean genotypes, soil from the states of Goiás, Minas Gerais and Paraná. Soil samples were collected from six areas in the depth of 0-20 cm for conducting chemical and physical analyzes and an test was conducted in a greenhouse in pots of 3 liters sterilized with 11 wild bean genotypes to obtain the isolates. Were obtained 523 isolates of rhizobia and selected 231 isolates, 76 of Goiás, Minas Gerais 99, and 56 of Paraná. A total of seven species of bacteria as reference strains, three of the genus Rhizobium tropici (SEMIA 4077, SEMIA 4080 and SEMIA 4088), three of the genus Rhizobium leguminosarum bv. phaseoli (BR266, BR351 and BR281) and one of the genus Rhizobium multihospitium (R82), for comparison with the data obtained. The isolates were characterized morphologically and on the use of carbon sources. From the information similarity matrices were generated using Jaccard coefficient being generated for the states of Goiás, Minas Gerais and Paraná, similarity dendrograms by UPGMA clustering method, using the software NTSYS-pc, version 1.8. The 523 isolates were obtained from nodules of wild bean genotypes with the predominance of isolates that acidify the culture medium and fast growth, and the solos from Araucária and Prudentópolis produce greater amount of mucus that of Jussara, Nova Veneza, Uberlândia and Unaí. The rhizobia isolates obtained from soils of Goiás and Minas Gerais exhibit greater phenotypic diversity than those from soils of Paraná. Usage analysis of carbon sources revealed that rhizobia isolates obtained from soils of Goiás have higher metabolic diversity. Overall, the largest number of isolates grouped with the reference strains, especially with the inoculant strains used as the common bean (SEMIA 4080, SEMIA SEMIA 4088 and SEMIA 4077), indicating that these isolates have metabolic characteristics similar to these strains.Item Caracterização de voçorocas em bordas de relevo residual tabular em Quirinópolis(Universidade Federal de Goiás, 2010-02-25) Sousa, Alik Timóteo de; Correchel, Vladia; http://lattes.cnpq.br/4781536691286837; Correchel, Vladia; Damin, Virgínia; Romão, Patrícia de Araújo; Bakker, Alexandre Pereira deThe city of Quirinópolis, which is located in the Southwest part of Goiás State, in the Basin of Paranaíba River, is consisted by smoothed reliefs containing residual tabular hills whose altitudes range from 370 to 880m. The “Serra da Confusão do Rio Preto”, located in the center part of the city, is representative on the local landscape. In the highest parts of this hill there are many erosive foci, which are of a huge size, especially of gullies type and mainly near of its south edge, where it is developed a big dissected recess containing several headwaters drainage. Two gullies were selected for detailed studies because they are in the same geomorphological situation of a concave edge of a residual relief, however, related to different systems of soil, one on a pedological cover represented by a Red Dusky Soil, Plinthosol petroferric and Gley soil and one on PSAMENT and Histosols . The study aimed to identify the source, the constraints and the evolution of the processes that caused the emergence and evolution of gullies to devise proposals for stabilization and / or appropriate control. Five interviews were carried out with former residents of the hill about the origin and evolution of the selected gullies. Subsequently, thematic maps were produced in the physical environment of use and occupation of the research area and as a source, satellite images Landsat TM (60 m resolution) 1980 and Landsat TM5 (30 m resolution) and SRTM images in 2008, to observe the evolution of land uses and gullies throughout this period. The operational capabilities of the software used were: Envi 4.3, Arc Map - ArcGIS 9.2, Spring 5.0 and CorelDRAW X3 version 13. Then, the entries were drawn erosive events according to the methodology of the IPT. Later on, they were described the horizons of exposed soil on the slopes of gullies in toposequence, with the use of rappelling. The physico-hydric soil characteristics were obtained from field tests of resistance to penetration with an impact penetrometer, saturated hydraulic conductivity using the Guelph permeameter, followed by the characterization of the physical attributes (water content, texture, density particles and soil total porosity, macro and micro) and chemical (pH, OM, Fe, P, K, Ca, Mg, H + Al, Al, CEC and V). Analyses were performed by ANOVA and Tukey test at 5% of probability for the comparison of means. The results showed that the gully of “Córrego do Andre” is developing on old scar erosive, as evidenced by the identification of horizons and / or different soil layers between the right and left slope erosion that probably were deposited by successive cuts and fills. Its evolution is driven by surface flows concentrated on cattle trails that surround it, associated with concentrated flows that spill over the terraces and reach their borders, as well as through the exfiltration of subsurface water in contact horizons Bw Bc or with C underlying the slopes strongly inclined. The Ting gully soils with lower clay in its upper reaches, has low penetration resistance (compaction) and high hydraulic conductivity, so the progression is linked to performance continues the erosion mechanisms represented by the internal pipings. The superficial runoff contributes little to the progression of this erosion.Item Frações da matéria orgãnica e atributos biológicos do solo em veredas conservadas e antropizadas no bioma cerrado(Universidade Federal de Goiás, 2013-08-14) Sousa, Ricardo Fernandes de; Leandro, Wilson Mozena; Brasil, Eliana Paula Fernandes; http://lattes.cnpq.br/7324619074753727; Madari, Beáta Emoke; Leandro, Wilson Mozena; Borges, Jácomo Divino; Figueiredo, Cícero Célio de; Brasil, Eliana Paula FernandesVeredas (a type of wetland) are humid ecosystems, generally associated to hydromorphic soils and shallow water table, which occur frequently in the neighborhood of the springs and watercourses in the Cerrado region. The objective of this work was to study the soil of wetlands located in conserved and altered environments (agricultural areas and pastures), by determining the organic matter fractions, and biological attributes of the soil. The study was carried out in the central region of Cerrado biome, in the state of Goiás (Brazil), in wetlands situated in the City of Bela Vista de Goiás. Three wetlands were selected for soil sampling, as follows: a preserved wetland, surrounded by natural vegetation (cerrado); an area disturbed, with the occurrence of pasture around it; and another wetland also disturbed, with the occurrence of annual crops (agriculture) in its surroundings. The samplings were taken during the dry season, in months of July and August of 2012, along reference lines arranged according to their position in the slope, in the upper, middle and lower position, in approximate direction of the drain line of the wetland. Samples were collected at two depths: 0-10 cm and 10-20 cm. The variables studied were: Total soil organic carbon and nitrogen, and soil C:N ratio; C and N contents, and C:N ratios of the particulate and mineral-associated organic matter; fulvic acid, humic acid and humin, and humic acids to fulvic acids ratio, C contents of humic substances and its ratio to total soil organic carbon; carbon and nitrogen contents, and C:N ratio of the microbial biomass; microbial quotient; microbial biomass N to soil total nitrogen ratio; basal soil respiration; metabolic quotient; and fluorescein diacetate (FDA) hydrolytic activities in soil. In the lower position of slope the total soil organic C and N contents (in both depths), and levels of organic carbon in particulate organic matter, humic substances and soil microbial biomass (to 10 cm depth only), are smaller in the agriculture surrounding environment. Also in the lower position of slope in the topsoil, the soil total N, and N levels in particulate organic matter and microbial biomass are significantly larger in the wetland neighboring pastures. In the topsoil, the organic C contents of the mineral-associated soil organic matter fraction are larger in the conserved ecosystem, in all slope positions. In general, the farming in the vicinity of the wetlands promoted changes in soil microbial and biochemical attributes, as well as those related to soil organic matter in these ecosystems, with changes in C and N biogeochemistry processes. These changes are especially pronounced in the lower position of the slopes, with clear differences also between this lower zone and the highest slope positions (upper and middle) of the wetlands.Item Polimorfismo e expressão de genes de celulose sintase em eucalyptus(Universidade Federal de Goiás, 2007) Trigueiro, Elaine Lima; Coelho, Alexandre Siqueira Guedes; http://lattes.cnpq.br/0840926305216925Cellulose is one of the most important and the most abundant biopolymer on the planet, playing a key role on the evolutionary history of plants. Important advances have been made in recent years, in particular on the identification of genes and co- expressed genes for the formation of cellulose in the primary and secondary cellular walls of plants. In addition to its biological relevance, cellulose has a great economic importance, not only in Brazil but in the world, especially due to the production of cellulose and paper from Eucalyptus. The high levels of production and competition in the international market are guaranteed by great investments, which are carried through by the forestal sector, in particular by the Genolyptus Project – Brazilian Network for Research on Eucalyptus Genome. This project is the result of a collective effort of companies involved on the production of cellulose and paper and various public research institutions. Their main goal is to identify and characterize genes involved in wood formation with the intent to genetically improve Eucalyptus. Based on this goal, this work was developed with two objectives. The first is doing a preliminary characterization of the cellulose synthase gene in Eucalyptus, which is associated with the synthesis of the secondary cellular wall and is orthologous to the gene EgCeA2, of E. grandis. The second objective is to study the linkage disequilibrium in another gene of cellulose synthase, orthologous to the EgCesA3 gene, sampled from a wild population of E. urophylla. Regarding the CesA2 gene, an exonic region with 427bp was sequenced from DNA samples of 12 individuals from different species and geographic regions. The next step was to proceed with an analysis to detect polymorphism which gave an estimate of three SNPs synonymous along the contig, with an estimated π = 0.00212 diversity index. A clone containing the CesA2 gene was identified through a selection from a BAC library generated in the scope of the Genolyptus Project. This clone gives the prospect for the development of a minute characterization of this gene structure in Eucalyptus. Additionally, concerning the CesA3 gene, the sequencing of 32 individuals allowed for the formation of a 770bp contig with a π = 0.00185 diversity index and detection of nine polymorphic loci distributed in intron and exon regions and at the 3’-UTR of the gene. The analysis of the extension of linkage disequilibrium in the CesA3 gene suggests that SNPs tend to be in strong linkage disequilibrium at a distance of approximately 600bp. The knowledge of the position of the SNPs in the genes CesA2 and CesA3 makes possible the use of these markers in future studies of genetic mapping. The lack of non-synonymous SNPs in exon regions ensures that cellulose is in fact a very important polymer for plant survival. Hence its synthesis machinery presents highly conserved characteristics and so mutations in regions with effective transcription tend mostly to be deleterious and therefore would not be fixed. Moreover, the analysis of CesA gene expression in different species of Eucalyptus, was made from two boardings: “Digital Differential Display”, from different libraries of ESTs and microarrays, optimized in the scope of the Genolyptus project. The analysis with data of microarrays showed less sensible in the detention of the distinguishing expression, probably had to the calls “crossed relations”.Item Composição e produtividade do milheto em três densidades de semeadura e duas alturas de corte(Universidade Federal de Goiás, 2013-10-10) Trindade, Josilene da Silva; Banys, Vera Lúcia; http://lattes.cnpq.br/0086763325318228; Dias, Fernando José dos Santos; http://lattes.cnpq.br/4403222331437374; Saenz, Edgar Alain Collao; http://lattes.cnpq.br/6136194482996787; Saenz, Edgar Alain Collao; Dias, Márcia; Paiva, Luisa MelvilleTo evaluate the chemical composition and production of pearl millet (Pennisetum glaucum (L.)) at different sowing densities and managed under different cutting heights, a field trial was carried out at Santa Rosa do Rochedo farm of Universidade Federal de Goiás Campus Jatai, from March to July (second-season) after soybean harvest. A completely randomized block experimental design in factorial arrangement (3x2) with three sowing densities (10, 15 and 20 kg.ha-¹) and two cutting heights (50 and 70 cm) was used. Data were analyzed with SAS® v.9.2 program (SAS Institute Inc., Cary, NC) considering density effect and block in the plot and height in the subplot. Tukey test at 5% probability was used for mean comparison. The sowing density affected (P<0.05) CP percentage (13.98, 13.07 and 12.73 for 10, 15 and 20 kg.ha-¹ densities respectively). The cutting height influenced (P <0.05) chemical composition and production when compared one cut of each height, lower values of NDF (60,3%), ADF (35,7%) and higher levels of MM (8,8) and NFC (15,5%) were observed at 50 cm height cut. There were no effect (P> 0.05) of sowing density and cutting height on total yield during the experimental period. Due the better nutritional quality with longer period of pasture utilization and lower deployment cost, the use of pearl millet for grazing in the southwestern Goiás is feasible at sowing density of 10 kg.ha-¹ and height cut of 50 cm.