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Search Results: 1 - 10 of 166230 matches for " Giovani O da;Castro "
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Desempenho agron?mico de clones elite de batata
Silva, Giovani O da;Castro, Caroline M;Terres, Laerte R;Rohr, Angela;Suinaga, Fábio A;Pereira, Arione da S;
Horticultura Brasileira , 2012, DOI: 10.1590/S0102-05362012000300034
Abstract: the aim of this work was to verify the growth cycle, yield components and specific gravity of advanced potato clones as compared to the main varieties grown in brazil. the experiment was carried on at the embrapa clima temperado experimental field, in pelotas, rio grande do sul state, brazil. eight advanced potato clones developed by the embrapa potato breeding program, and two commercial cultivars were evaluated in the autumn season of 2011. a randomized complete block design with four replications was used, the plots being constituted by a line of 20 plants. growth cycle was assessed 95 days after planting. plants of each plot were harvested at 110 days, followed by evaluation of yield components and specific gravity. after checking for normality of error distribution, the data were submitted to analysis of variance and to means grouping by the scott & knott test. cl02-05, cl69-05, cl27-05 and 2197-15 clones showed higher commercial tuber number, percentage of commercial tubers and average tuber weight than the check varieties. cl02-05 clone showed, besides, the highest yield potential of commercial tubers of all four clones. cl69-05 and 2197-15 presented specific gravity and growth cycle similar to asterix, but had higher yield potential and larger tuber size than it.
Repetibilidade e importancia de caracteres para avalia??o de cole??o ativa de germoplasma de batata
Silva, Giovani O da;Pereira, Arione S;Castro, Caroline M;Souza, Velci Q;Carvalho, Fernando IF;Fritsche Neto, Roberto;
Horticultura Brasileira , 2009, DOI: 10.1590/S0102-05362009000300005
Abstract: as the genetic base of the cultivated potato (solanum tuberosum l.) is narrow, it is important to use the existing germplasm in the breeding programs, associated with an efficient characterization method. we verified the repeatability, the necessary number of evaluations and the relative importance of phenotypic characters in the characterization of an active potato germplasm bank. a group of 77 potato cultivars and elite clones was cultivated in the experimental field of embrapa clima temperado, on spring seasons of the years 1999, 2000, 2001, 2002 and 2003. the plots consisted of a single row of 15 plants, spaced 0.30 x 0.80 m, within and between rows, respectively. thirty-three plant and tuber descriptors characters were evaluated. the data were submitted to the analysis of variance, repeatability and importance of characters. stem pigmentation and color intensity of the sprout base are the more important characters to characterize the potato germplasm, either by the percentage of contribution or by the repeatability of the expression in the various growing years, reflecting in a reduced number of necessary evaluations. the characters leaf coalescence and vein pigmentation, presence of wings, foliage type, leaf insertion, leaflet width, leaflet size, skin color, flower frequency, pubescence of sprout base, peduncle and external corolla pigmentation, apex aspect, and skin roughness showed reduced repeatability and/or small contribution for the dissimilarity. therefore they should receive less emphasis in the evaluations.
Sele??o em gera??es iniciais para caracteres agron?micos em batata
Silva, Giovani O da;Pereira, Arione da S;
Horticultura Brasileira , 2011, DOI: 10.1590/S0102-05362011000400001
Abstract: this review aimed to make some considerations about the selection in early generations (seedling generation, first and second clonal generations) and its implications for the potato breeding, which requires the evaluation of thousands of seedlings in order to identify the best genotypes. considering the high costs of the breeding process, the constant improvement of the selection techniques by the utilization of experimental information is essential. the elimination of the worst genotypes as earlier as possible, by means of selection in early generations, avoids that the inferior genotypes be kept in the population, providing considerable reduction in inputs, field and labor, which means a lower cost. although there are some studies in the literature reporting low selection efficiency of potato genotypes in early generations, mainly in relation to quantitative characters; other publications show it is efficient. it was concluded that selection in early generations, beginning in the seedling generation, is a viable alternative, allowing higher versatility and efficiency to the potato breeding programs. however, the traits more effective to be selected and the selection pressure applied should be defined in order to avoid the elimination of materials that should be kept in the population.
Divergência genética entre acessos de batata-doce utilizando caracteres fenotípicos de raiz
da Silva, Giovani O;Ponijaleki, Rubens;Suinaga, Fabio A;
Horticultura Brasileira , 2012, DOI: 10.1590/S0102-05362012000400006
Abstract: the estimation of the genetic divergence among accessions of a germplasm bank, as well as their characterization are very important in breeding programs in order to identify the best parental genotypes and to provide a better understanding of the available plant genetic resources. considering this information, the objectives of this research were: (1) evaluate the sweet potato plant accessions of embrapa germplasm bank based on root traits; (2) estimate the relative importance of quantitative morphoagronomic characters in the genotype discrimination; and (3) find out promising hybrid combinations for crosses. then, 11 sweet potato clones from embrapa germplasm bank were evaluated in a trial at embrapa spm/en canoinhas, brazil. the genotypes were cultivated in field conditions on a randomized blocks experimental design with four replications; the experimental plot was composed of 10 plants. in each experimental plot the plants were harvested and 12 characteristics of the roots were evaluated. the total number and mass of roots, and the specific gravity were the characteristics with the greatest influence on the genetic divergence. most of the evaluated genotypes were closely related considering their quantitative characteristics. however, it is possible to obtain useful gains with heterosis and the generation of superior progenies, through crosses between genotypes from the different groups; because the most contrasting genotypes '1228', '051-1' and '1270' were grouped among the best ones for various characteristics such as mass and total number of roots, marketable root mass, the first two showed a high specific weight and '1270' intense orange color, indicative of high levels of β-carotene.
Genetic distances of potato genotypes based upon using morphological, genealogical, and molecular data / Distancias genéticas entre genótipos de batata a partir de dados morfológicos, moleculares e genealógicos
Giovani Olegário da Silva,Arione da Silva Pereira,Velci Queiroz de Souza,Caroline Marques Castro
Semina : Ciências Agrárias , 2009,
Abstract: The objective of this work was to compare estimates of genetic distances of potato genotypes using genealogical, morphological and molecular data, and jointed data (morphological and molecular). The work was carried on at Embrapa Clima Temperado and UFPel/FAEM/Laboratório de Gen mica e Fitomelhoramento. The evaluaton was with a set of 13 potato cultivars and elite clones of the Embrapa Clima Temperado Active Germoplasm Bank of Potatoes. The field experiments were grown in springs of 1999, 2000, 2001, 2002 and 2003, in single 20 plant plots, spaced at 0.30m between plants and 0.80m between rows. The genotypes were evaluated morphologically for 33 plant and tuber traits and for AFLP markers. The analysis of variance, considering year as replication, revealed no significant differences only for leaflet width, flowers frequency, stalk pigmentation e apex aspect. Correlations between dissimilarity matrices were significant only for jointed (morphologic and molecular) and molecular matrix. Therefore, all estimates of genetic distance between potato genitors should be considered in planning crosses. O objetivo do trabalho foi comparar estimativas de distancia genética entre genótipos de batata usando dados genealógicos, morfológicos, moleculares e conjuntamente, dados morfológicos e moleculares. Os trabalhos foram realizados na Embrapa Clima Temperado e na UFPel/FAEM/Laboratório de Gen mica e Fitomelhoramento. Foi avaliado um conjunto de 13 cultivares e clones elite, componentes do Banco Ativo de Germoplasma de Batata da Embrapa Clima Temperado. Os experimentos de campo foram realizados nas primaveras de 1999, 2000, 2001, 2002 e 2003, em parcelas únicas de 20 plantas, espa adas 0,30m entre plantas e 0,80m entre fileiras. Os genótipos foram avaliados em rela o a 33 caracteres morfológicos de planta e tubérculo e analisados molecularmente usando marcadores AFLP. A análise de variancia, considerando ano como repeti o, n o revelou diferen as significativas somente em rela o à largura dos folíolos, frequência de flores, pigmenta o do pedúnculo e aspecto do ápice. Apenas a correla o entre matrizes de dissimilaridade conjunta (morfológico e molecular) e molecular foi significativa. Portanto, todas as estimativas de distancia genética entre genitores de batata deveriam ser consideradas no plano de cruzamentos.
Methodological Guidelines for the Use of Geoprocessing Tools: Spatial Analysis Operations—Kernel, Buffer and the Remote Sensing Image Classification  [PDF]
Christian Nunes da Silva, Jo?o Marcio Palheta da Silva, Carlos Jorge Nogueira Castro
Agricultural Sciences (AS) , 2015, DOI: 10.4236/as.2015.67068
Abstract: The so-called geotechnology has been used in recent years in the planning, supervision and monitoring of various human activities, both locally and regionally, nationally and internationally, either it in the rural environment, as in urban áreas. This study, based on references and activities in the Geographic Information Analysis Laboratory of the Federal University of Pará (LAIG/UFPA), selects and presents the application of three tools for spatial analysis available in the Terraview [1] and Arcgis softwares, with the main objective being to demonstrate how they can be applied in geographical studies, starting with the spatial information gathered by remote or Field sensors, assisting the activities of researchers who stick to working with the planning and management of natural and human resources. Geotechnologies are important tools in the analysis of geographic space and its use tends to be increased with the advancement of new software and hardware collection, manipulation and generation of new specialized information. So we will do in this manuscript a brief discussion of three spatial analysis tools that can be used in rural areas with agricultural potential.
Ganhos genéticos para caracteres de raiz em popula??es de cenoura nos sistemas organico e convencional de produ??o
Silva, Giovani O da;Vieira, Jairo V;Carvalho, Agnaldo F de;
Horticultura Brasileira , 2012, DOI: 10.1590/S0102-05362012000300019
Abstract: the objective of this work was to evaluate the genetic gain with the selection of root characters of carrot populations cultivated in organic and conventional production systems. the experiments were carried out at embrapa hortali?as, brasília, brazil. two carrot populations derived from brasília cultivar and with common origin until 2002, were separate in two populations and evaluated for eight generations during 2000 to 2007. in 2008, seed samples of the population in each cycle of selection were sowed in the field in both organic and conventional production systems, in a randomized blocks design with four replications of nine treatments and plots of 1 m2. after 90 days of sowing, 20 roots per plot were harvested for the evaluation of the length, xylem and phloem diameter, green shoulder length, fresh mass, presence of halo, tip and shoulder format, and the color parameters of xylem and phloem. variance analysis was carried out to determine the interaction between treatments and production systems, grouping of means among treatments, and the real gain with the selection was estimated. in the last eight years of selection, a significant gain was not observed on the studied characters in the two populations. so we concluded that those traits are already quite developed and stabilized in both populations. the selection doesn't need to be accomplished in both areas of organic and conventional cultivation, making possible the decrease of financial and labor resources utilized in the breeding.
Sele??o para resistência de genótipos de cenoura aos nematóides-das-galhas
Silva, Giovani O da;Pinheiro, Jadir B;Vieira, Jairo V;Carvalho, Agnaldo DF de;
Horticultura Brasileira , 2011, DOI: 10.1590/S0102-05362011000300013
Abstract: we verified the relation among the evaluated characters in field and greenhouse, concerning to the evaluation to root-knot nematode (meloidogyne spp.) for the carrot crop, to identify for which ones it is possible to differentiate among genotypes and to verify the possibility of evaluation only in one environment or the elimination of characters with high correlation. thirty eight and thirty one families from the carrot populations '0812518' and '0812519', and the cultivars brasília and kuronan as tolerant and susceptible standards, respectively, were evaluated. in a field whose soil was naturally infected by a mix of meloidogyne incognita race 1 and meloidogyne javanica, the selection to resistance to root-knot nematode was based on lower percentage of infection in the root, of the major genotypes of carrot production in t/ha and reproduction factor; and in greenhouse, to each one of the same nematode species and too for a mix of both, was evaluated the index of gall and index of egg mass. there is no possibility of selection in only one condition or the elimination of some characters, indicating that, to obtain more yielding and more tolerant cultivars, the combined selection in the various characters and environments are necessary. in the field experiment, it was only possible to differentiate the genotypes for root yield. in the greenhouse, it was possible to identify superior genotypes for all characters tested. however, the average population was not better than the 'brasilia' standard that originated these populations. this result confirms the necessity to search for more efficient methods of selection.
Estimativa de capacidades de combina??o em gera??es iniciais de sele??o de batata
Silva, Giovani O da;Pereira, Arione da S;Souza, Velci Q de;Carvalho, Fernando Irajá F de;Fritsche Neto, Roberto;
Horticultura Brasileira , 2009, DOI: 10.1590/S0102-05362009000300002
Abstract: the combining ability of potato genotypes was estimated in early generations of selection. the experiments were carried out at embrapa clima temperado, in pelotas, brazil. twenty potato families derived from nine genotypes crossed in a 4 x 5 partial mating design (c-1750-15-95, 2cri-1149-1-78, c-1786-6-96 and 'eliza'; 'white lady', 'asterix', 'bp-1', 'vivaldi' and 'ágria') were evaluated. the families were evaluated in seedling and first field generation, in a randomized complete block design, with three replications of 15 genotypes. each plot consisted of a sample of 15 genotypes of a family. in the two generations, yield, number and average tuber weight were evaluated. the data were submitted to analysis of variance and to partial diallel analysis. for yield, the gene additive effects predominated, while for tuber number and average tuber mass, both additive and non additive effects were equally important. 2cri-1149-1-78 and 'white lady' showed to be the most promising parents for the three traits, while 'ágria' revealed superiority for mean tuber weight. the two generations presented similar estimative of general combining ability.
Organo-gel: um novo sistema para a imobiliza??o de lipases e sua aplica??o em síntese organica
Jesus, Paulo Cesar de;Jo?o, Jair Juarez;Silva, Pedro Luiz Ferreira da;Burlin, Giovani;Nascimento, Maria da Gra?a;
Química Nova , 1997, DOI: 10.1590/S0100-40421997000600016
Abstract: lipases have been immobilized in microemulsion-based organogels (mbg's) and successfully utilized for the enantioselective esterification, diesterification and transesterification reactions, in organic solvents at 25oc. this methodology is described as a new alternative for the use of enzymes in organic solvents. high enzymic stability has been observed. we have also used this methodology for the successful resolution of chiral secondary alcohols. this is a convenient way of using this catalyst in organic solvents which employs small amounts of the enzyme (250mg/ml).
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