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Search Results: 1 - 10 of 180084 matches for " Velci Queiroz de;Carvalho "
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Combining ability of wheat genotypes in two models of diallel analyses
Igor Pirez Valério,Fernando Irajá Félix de Carvalho,Antonio Costa de Oliveira,Velci Queiroz de Souza
Crop Breeding and Applied Biotechnology , 2009,
Abstract: Diallel analyses are commonly used for the estimate of population genetic effects. Different models can beused, with a direct effect on the inferences. The objective of this study was to determine and compare two diallel analysismodels, fixed and random, regarding the combining effects among six wheat genotypes. The experiment was conducted in thecounty of Cap o do Le o/RS in the year 2006. Six wheat genotypes were used that were used for artificial crosses accordingto a complete diallel model without reciprocals, resulting in 15 hybrid combinations. The data were subjected to diallelanalyses according to model 2 of Griffing (fixed) and BLUP (random). The results show that both diallel models indicatesimilar general combining ability effects. On the other hand, for the specific combining ability, the data must be used withcaution, considering the two models simultaneously.
Correlations between insect resistance and horticultural traits in potatoes
Velci Queiroz de Souza,Arione da Silva Pereira,Giovani Olegário da Silva,Fernando Irajá Félix de Carvalho
Crop Breeding and Applied Biotechnology , 2006,
Abstract: The objective of this study was to determine relationships between insect resistance and some horticulturaltraits and the implications on selection. A potato population of 11 clonal families derived from crosses between insect resistantand genotypes adapted to the southern region of Brazil was used. The following traits were evaluated: plant size and vigor,incidence of insect attacks on leaves and tubers, tuber yield and appearance components. Phenotypic and genotypic correlationsbetween leaf and tuber resistance were not significant for the population, while phenotypic correlations between the tworesistance types were significant for individual families, with exception of the family originated from the cross involving ND263-32 . The incidence of insect attacks on tubers was significantly correlated with tuber yield and appearance in familiesderived from crosses of NYL235-4 . The manifold correlations of leaf resistance with horticultural traits for all families weresignificant and unfavorable.
SSR Locator: Tool for Simple Sequence Repeat Discovery Integrated with Primer Design and PCR Simulation
Luciano Carlos da Maia,Dario Abel Palmieri,Velci Queiroz de Souza,Mauricio Marini Kopp,Fernando Irajá Félix de Carvalho,Antonio Costa de Oliveira
International Journal of Plant Genomics , 2008, DOI: 10.1155/2008/412696
Abstract: Microsatellites or SSRs (simple sequence repeats) are ubiquitous short tandem duplications occurring in eukaryotic organisms. These sequences are among the best marker technologies applied in plant genetics and breeding. The abundant genomic, BAC, and EST sequences available in databases allow the survey regarding presence and location of SSR loci. Additional information concerning primer sequences is also the target of plant geneticists and breeders. In this paper, we describe a utility that integrates SSR searches, frequency of occurrence of motifs and arrangements, primer design, and PCR simulation against other databases. This simulation allows the performance of global alignments and identity and homology searches between different amplified sequences, that is, amplicons. In order to validate the tool functions, SSR discovery searches were performed in a database containing 28 469 nonredundant rice cDNA sequences.
Qualidade de película de famílias clonais de batata
Silva, Giovani Olegario da;Pereira, Arione da Silva;Souza, Velci Queiroz de;Carvalho, Fernando Irajá Félix de;Vieira, Eduardo Alano;
Bragantia , 2008, DOI: 10.1590/S0006-87052008000300011
Abstract: tuber general appearance is a very important trait for potato breeding, once it affects consumer acceptance of in natura products. among appearance components the tuber coloration and smooth are very important. the objective of this work was to investigate the expected selection response for traits related to skin quality (smooth and coloration) and tuber appearance in three potato families. the experiments were performed in the experimental field of embrapa clima temperado during the spring of 2004 and 2005, using three families at second and third clonal generations, respectively. the traits smooth, skin coloration and tuber general appearance in the tubers were evaluated. data was analyzed statistically according to the model reml/blup, in way to distinguish fixed and aleatory effects and comparing values among the families, correlation between traits, heritability index and gain of selection. it can be verified that, for the development of superior potato populations regarding skin quality, the inclusion of parents bearing flat and clear skin is necessary. the traits smoothness and tuber coloration are correlated with the tuber general appearance, but this trait has lower heritability than its components.
Capacidade de combina??o multivariada para caracteres de tubérculo em gera??es iniciais de sele??o em batata
Silva, Giovani Olegario da;Pereira, Arione da Silva;Souza, Velci Queiroz de;Carvalho, Fernando Irajá Félix de;Vieira, Eduardo Alano;
Ciência Rural , 2008, DOI: 10.1590/S0103-84782008000200004
Abstract: the diallel analysis provides estimates of useful parameters to parent selection and to the understanding of the genetic effects involved in a trait control. this research was aimed at estimating multivariate combining ability of potato parents in the initial generations of selection. twenty potato clonal families (5*4) of nine genotypes in a partial diallel design were evaluated for two successive generations. the experiments were conducted at the embrapa clima temperado, in pelotas, rs (31° s, 52° w), in the spring of 2005 and autumn of 2006. fourteen morphological tuber traits were evaluated and the six more stable, or those that were best repeated in the generations were selected for further analysis. the analysis of variance revealed significant differences for all traits. the diallel multivariate analysis, using principal components, showed "2cri-1149-1-78", "eliza", "c-1786-6-96" and "white lady" genotypes with higher general combining ability for tuber appearance, smoothness, eye brown, pointing, curving and flatness, contributing with additive effects for crossings. the "c-1750-15-95"/"agria", "c-1786-6-96"/"asterix" and "eliza"/"asterix" cross combinations were outstanding for specific combing ability for tuber eye brown, pointing, curving and flatness, and "2cri-1149-1-78"/"vivaldi", "eliza"/"bp1" and "eliza"/"agria" for tuber appearance, smoothness and eye brown.
Seeding density in wheat genotypes as a function of tillering potential
Valério, Igor Pirez;Carvalho, Fernando Irajá Félix de;Oliveira, Ant?nio Costa de;Benin, Giovani;Souza, Velci Queiroz de;Machado, Amauri de Almeida;Bertan, Ivandro;Busato, Cyrano Cardoso;Silveira, Gustavo da;Fonseca, Daniel Andrei Rob;
Scientia Agricola , 2009, DOI: 10.1590/S0103-90162009000100004
Abstract: seeding density adjustments is one of the practices that most influence grain yield, as well as other agronomic traits. therefore, the objective of this study was to determine the ideal plant stand to achieve the maximum grain yield in genotypes showing differential tillering ability. also, to establish the associations between the genotypes used with tillering and other agronomically important traits as weight of a thousand grains. two experiments were conducted in 2005 and 2006 in cap?o do le?o, rio grande do sul state, brazil. five low (juriti, br 18, cep 29, br 18 and cd 108) and five high (cd 114, safira, figueira, brs 177 and umbu) tillering potential wheat cultivars were tested for two years on a split-plot design. the results indicate the need for recommending cultivars based on more than one year of cultivation, especially when dealing with contrasting genotypes for the trait fertile tillers. regarding the ideal plant stand, seeding density of low tillering ability genotypes ranges from 417 to 555 seeds m-2, in order to obtain maximum yield and grain weight. on the other hand, for high tillering ability genotypes, the ideal stand ranges from 221 to 422 seeds m-2. these results were year independent. furthermore, low tillering ability genotypes showed a closer association of number of fertile tillers with grain yield. however, an inverse association was found between number of fertile tillers and weight of a thousand grains.
Importancia de caracteres na dissimilaridade de progênies de batata em gera??es iniciais de sele??o
Silva, Giovani Olegário da;Pereira, Arione da Silva;Souza, Velci Queiroz de;Carvalho, Fernando Irajá Félix de;Oliveira, Ant?nio Costa de;Bertan, Ivandro;Fritsche Neto, Roberto;
Bragantia , 2008, DOI: 10.1590/S0006-87052008000100017
Abstract: the objective of the present work was to access the implications of the use of analysis of importance of characters in the elimination of appraised characters for calculating genetic distance of potato (solanum tuberosum l.) progenies in early generations. the experiments were carried out in plastic house (seedling generation) and in the field (first clonal generations) at embrapa temperate climate, pelotas, rio grande do sul state in autumn 2004 and 2005. the study was demonstrated the efficiency of the analysis in importance of characters for reducing the number of characters necessary for classifying potato progenies in relation to the dissimilarity. tuber shape was the character with the largest efficiency for the dissimilarity study in potato progenies.
Dissimilaridade genética em mutantes de aveia tolerantes e sensíveis a ácidos organicos
Souza, Velci Queiroz de;Pereira, Arione da Silva;Kopp, Mauricio Marini;Coimbra, Jefferson Luiz Meirelles;Carvalho, Fernando Irajá Félix de;Luz, Viviane Kopp da;Oliveira, Ant?nio Costa de;
Bragantia , 2005, DOI: 10.1590/S0006-87052005000400006
Abstract: in order to cultivate oats (avena sativa l.) as an economically alternative in low lands, it is necessary to use cultivars tolerant to the main organic acids produced by organic matter decomposition resulting from no tillage systems. the objectives of this work were estimate genetic dissimilarity among m3 mutant families and the oat cultivar ufrgs 14 using issr markers; and to detect genomic regions associated with organic acids toxicity. thirty m3 mutant families from the plant genomic center of the college of agronomy "eliseu maciel", derived from the cultivar ufrgs 14 irradiated with gamma ray (co60) at 400 gy dosage were used. the genetic characterization was carried out using the issr marker technique. the results indicated that ubc 854, 855 and 811 primers allowed the identification of genomic regions related to organic acid toxicity tolerance, while ubc 850 and 826 primers of genomic regions associated to organic acid sensitivity.
Esperan?as matemáticas dos quadrados médios: uma análise essencial
Coimbra, Jefferson Luís Meirelles;Souza, Velci Queiroz de;Kopp, Maurício Marini;Silva, Jo?o Gilberto Corrêa da;Oliveira, Ant?nio Costa de;Carvalho, Fernando Irajá Félix de;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000600010
Abstract: this research was aimed at evaluating and identifing which type of sum of squares can be more appropriate to test hypotheses and also presenting appropriate alternatives to solution of problems through the analysis of mean square expected values used in the methodology of mixed linear models. the analysis of mean square expected values can be a tool of great importance in analysis of data as incomplete (empty casela) as unbalanced experiment. therefore, four examples were used each one with its pecualiarity concerning the complete or incomplete experiment with balanced or unbalanced data and in the presence of empty casela. the sas statistical package, version learning edition, was used to analyze the experiments. the result of the analysis of mean square expected values indicated that the sum of squares of the type ?i? can be used only at of condition of completely balanced data. these results indicated on the other hand, that the sum of squares of the type ?iii? is the most appropriate type for unbalanced data. the sum of squares of the type ?ii? and ?iv? are the most important in the case of empty caselas; fact that supports the idea of a necessity of always evaluating the mean square expected values.
NOTE-Estimate of cross efficiency of potato parents
Roberto Fritsche Neto,Velci Queiroz de Souza,Arione da Silva Pereira,Giovani Olegário da Silva
Crop Breeding and Applied Biotechnology , 2006,
Abstract: The objective of this study was to estimate the cross efficiency of 43 genotypes frequently used as parents in thepotato breeding program of Embrapa Clima Temperado. The study was conducted under greenhouse conditions in theseasons autumn and winter/spring, from 2000 to 2004, in Pelotas, RS, Brazil. For each cross, the number of pollinated flowerbuds, the fruit-set and the number of seeds were recorded. Each season, in which the genotype was crossed, was considereda replication. The data were analyzed using the REML/BLUE statistic model. Male parents adapted to the ecological conditionsof the southern regions of Brazil presented higher efficiency in crosses than female parents. Genotypes used as male parentsinfluenced the number of seeds per flower bud more than female parents.
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