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	Provedor de dados Genet. Mol. Biol. (11) PAB (7) Scientia Agricola (5) Bragantia (3) Braz. J. Genet. (1) Ciência e Agrotecnologia (1) Mais... Autor Viana,José Marcelo Soriano (28) Silva,Fabyano Fonseca e (7) Cruz,Cosme Damião (5) Resende,Marcos Deon Vilela de (4) Faria,Vinícius Ribeiro (3) Matta,Frederico de Pina (3) Azevedo,Camila Ferreira (2) Cardoso,Antonio Américo (2) Câmara,Tassiano Maxwell Marinho (2) Lima,Leísa Pires (2) Lopes,Maria Teresa Gomes (2) Mundim,Gabriel Borges (2) Piepho,Hans-Peter (2) Regazzi,Adair José (2) Silva,Admilson da Costa e (2) Barros,Everaldo Gonçalves de (1) Bonomo,Paulo (1) Carneiro,Pedro Crescêncio Souza (1) Gesteira,Abelmon da Silva (1) José,Inês Chamel (1) Mais... Palavra-chave Zea mays (3) Full-sib families (2) Genetic parameters (2) Genome-wide selection (2) Genomic prediction (2) Half-sib families (2) Prediction accuracy (2) Seleção (2) Acurácia da predição (1) Adaptação (1) Additive value prediction (1) Akaike (1) Annona squamosa (1) Asian rice (1) Avaliação de qualidade (1) Average heterosis (1) BLASSO (1) Biometrical analyses (1) Breeding (1) Café (1) Mais... Tipo do documento Info:eu-repo/semantics/article (27) Info:eu-repo/semantics/report (1) Ano 2019 (2) 2017 (1) 2016 (3) 2011 (1) 2010 (1) 2009 (1) 2008 (1) 2007 (2) 2005 (1) 2004 (2) 2003 (4) 2001 (2) 2000 (4) 1999 (2) 1997 (1) Mais... País Brazil (28) Idioma Inglês (19) Português (9)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 28 Primeira ... 1 2 ... Última The parametric restrictions of the Gardner and Eberhart diallel analysis model: heterosis analysis Genet. Mol. Biol. Viana,José Marcelo Soriano. It was studied the parametric restrictions of the diallel analysis model of Griffing, method 2 (parents and F1 generations) and model 1 (fixed), in order to address the questions: i) does the statistical model need to be restricted? ii) do the restrictions satisfy the genetic parameter values? and iii) do they make the analysis and interpretation easier? Objectively, these questions can be answered as: i) yes, ii) not all of them, and iii) the analysis is easier, but the interpretation is the same as in the model with restrictions that satisfy the parameter values. The main conclusions were that: the statistical models for combining ability analysis are necessarily restricted; in the Griffing model (method 2, model 1), the restrictions relative to the... Tipo: Info:eu-repo/semantics/article Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572000000400028 The parametric restrictions of the Griffing diallel analysis model: combining ability analysis Genet. Mol. Biol. Viana,José Marcelo Soriano. It was studied the parametric restrictions of the diallel analysis model of Griffing, method 2 (parents and F1 generations) and model 1 (fixed), in order to address the questions: i) does the statistical model need to be restricted? ii) do the restrictions satisfy the genetic parameter values? and iii) do they make the analysis and interpretation easier? Objectively, these questions can be answered as: i) yes, ii) not all of them, and iii) the analysis is easier, but the interpretation is the same as in the model with restrictions that satisfy the parameter values. The main conclusions were that: the statistical models for combining ability analysis are necessarily restricted; in the Griffing model (method 2, model 1), the restrictions relative to the... Tipo: Info:eu-repo/semantics/article Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572000000400029 Quantitative genetics theory for non-inbred populations in linkage disequilibrium Genet. Mol. Biol. Viana,José Marcelo Soriano. Although linkage disequilibrium, epistasis and inbreeding are common phenomena in genetic systems that control quantitative traits, theory development and analysis are very complex, especially when they are considered together. The objective of this study is to offer additional quantitative genetics theory to define and analyze, in relation to non-inbred cross pollinating populations, components of genotypic variance, heritabilities and predicted gains, assuming linkage disequilibrium and absence of epistasis. The genotypic variance and its components, additive and due to dominance genetic variances, are invariant over the generations only in regard to completely linked genes and to those in equilibrium. When the population is structured in half-sib... Tipo: Info:eu-repo/semantics/article Palavras-chave: Components of genotypic variance; Heritabilities; Half-sib families; Full-sib families. Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000400021 Bias in the prediction of genetic gain due to mass and half-sib selection in random mating populations Genet. Mol. Biol. Viana,José Marcelo Soriano; Faria,Vinícius Ribeiro; Silva,Admilson da Costa e. The prediction of gains from selection allows the comparison of breeding methods and selection strategies, although these estimates may be biased. The objective of this study was to investigate the extent of such bias in predicting genetic gain. For this, we simulated 10 cycles of a hypothetical breeding program that involved seven traits, three population classes, three experimental conditions and two breeding methods (mass and half-sib selection). Each combination of trait, population, heritability, method and cycle was repeated 10 times. The predicted gains were biased, even when the genetic parameters were estimated without error. Gain from selection in both genders is twice the gain from selection in a single gender only in the absence of dominance.... Tipo: Info:eu-repo/semantics/article Palavras-chave: Predicted genetic gain; Realized genetic gain; Recurrent selection. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300012 Linkage disequilibrium, SNP frequency change due to selection, and association mapping in popcorn chromosome regions containing QTLs for quality traits Genet. Mol. Biol. Paes,Geísa Pinheiro; Viana,José Marcelo Soriano; Silva,Fabyano Fonseca e; Mundim,Gabriel Borges. Abstract The objectives of this study were to assess linkage disequilibrium (LD) and selection-induced changes in single nucleotide polymorphism (SNP) frequency, and to perform association mapping in popcorn chromosome regions containing quantitative trait loci (QTLs) for quality traits. Seven tropical and two temperate popcorn populations were genotyped for 96 SNPs chosen in chromosome regions containing QTLs for quality traits. The populations were phenotyped for expansion volume, 100-kernel weight, kernel sphericity, and kernel density. The LD statistics were the difference between the observed and expected haplotype frequencies (D), the proportion of D relative to the expected maximum value in the population, and the square of the correlation between... Tipo: Info:eu-repo/semantics/article Palavras-chave: Gametic phase disequilibrium; GWAS; Candidate gene. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572016000100097 Analysis of variance of partial diallel tables Genet. Mol. Biol. Viana,José Marcelo Soriano; Cruz,Cosme Damião; Cardoso,Antonio Américo; Regazzi,Adair José. The theory of variance analysis of partial diallel tables, following Hayman's proposal of 1954, is presented. As several statistical tests yield similar inferences, the present analysis mainly proposes to assess genetic variability in two groups of parents and to study specific, varietal and mean heteroses. Testing the nullity of specific heteroses equals testing absence of dominance. Testing equality of varietal heteroses of the parents of a group is equivalent to testing the hypothesis that in the other group allelic genes have the same frequency. Rejection of the hypothesis that the mean heterosis is null indicates dominance. The information obtained complements that provided by diallel analysis involving parents and their F1 hybrids or F2 generations.... Tipo: Info:eu-repo/semantics/article Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572000000100040 Analysis of general and specific combining abilities of popcorn populations, including selfed parents Genet. Mol. Biol. Viana,José Marcelo Soriano; Matta,Frederico de Pina. Estimation of general and specific combining ability effects in a diallel analysis of cross-pollinating populations, including the selfed parents, is presented in this work. The restrictions considered satisfy the parametric values of the GCA and SCA effects. The method is extended to self-pollinating populations (suitable for other species, without the selfed parents). The analysis of changes in population means due to inbreeding (sensitivity to inbreeding) also permits to assess the predominant direction of dominance deviations and the relative genetic variability in each parent population. The methodology was used to select popcorn populations for intra- and inter-population breeding programs and for hybrid production, developed at the Federal... Tipo: Info:eu-repo/semantics/article Palavras-chave: Diallele cross; Combining ability; Inbreeding depression; Popcorn breeding. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400010 Biometrical analyses of linolenic acid content of soybean seeds Genet. Mol. Biol. Gesteira,Abelmon da Silva; Schuster,Ivan; José,Inês Chamel; Piovesan,Newton Deniz; Viana,José Marcelo Soriano; Barros,Everaldo Gonçalves de; Moreira,Maurilio Alves. The genetic reduction of linolenic acid levels increases the quality and stability of soybean oil. The objective of this study was to determine the inheritance and evaluate the nature and magnitude of gene effects on soybean seed linolenic acid level. Means and variances of F1, F2, and F3 generations were made from the cross between accession BARC-12 (low linolenic acid content) and the commercial Brazilian cultivar CAC-1 (normal linolenic acid content). The results demonstrated that linolenic acid content in soybean is under the genetic control of a small number of genes. The additive model explained the means for the three generations and for the parents. Non-allelic gene interactions had little effect on the determination of genotypic values for the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Soybean oil composition; Linolenic acid content; Biometrical analyses. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000100011 Dominance, epistasis, heritabilities and expected genetic gains Genet. Mol. Biol. Viana,José Marcelo Soriano. Although epistasis is common in gene systems that determine quantitative traits, it is usually not possible to estimate the epistatic components of genotypic variance because experiments in breeding programs include only one type of progeny. As the study of this phenomenon is complex, there is a lack of theoretical knowledge on the contribution of the epistatic variances when predicting gains from selection and on the bias in estimating genetic parameters when fitting the additive-dominant model. The objective of this paper is to discuss these aspects. Regarding a non-inbred population, the genetic value due to dominance and the epistatic components of the genotypic value are not indicators of the number of favorable genes present in an individual. Thus,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Breeding; Genetic parameters; Gene interaction; Selection. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000100012 Theory and analysis of partial diallel crosses Genet. Mol. Biol. Viana,José Marcelo Soriano; Cruz,Cosme Damião; Cardoso,Antonio Américo. This study presents theory and analysis of partial diallel crosses based on Hayman's methods. This genetic design consists of crosses among two parental groups. It should be used when there are two groups of parents, for example, dent and flint maize inbred lines, and the breeder is not interested in the assessment of crosses between parents of the same group. Analyses are carried out using data from the parents and their F1 hybrids allowing a detailed characterization of the polygenic systems under study and the choice of parents for hybridization. Diallel analysis allows the estimation of genetic and non-genetic components of variation and genetic parameters and to assess the following: genetic variability in each group; genotypic differences between... Tipo: Info:eu-repo/semantics/article Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571999000400021 Components of variation of polygenic systems with digenic epistasis Genet. Mol. Biol. Viana,José Marcelo Soriano. In this paper an extension of the biometric model of Mather and Jinks for the analysis of variation with digenic epistasis is presented. Epistatic effects can contribute favorably to the determination of the genotypic values of selected individuals or families and of superior hybrids. Selection will be inefficient, however, if there is a large number of interacting genes because the epistatic components of the between-family and within-family genotypic variances are very high compared to the portion attributable to the average effects of genes. Selection tends to be efficient when the number of interacting genes is reduced, but this depends on the magnitude of due to dominance and environmental variances. The dominance component (H) and the epistatic... Tipo: Info:eu-repo/semantics/article Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572000000400030 Seleção genômica para melhoramento vegetal com diferentes estruturas populacionais PAB Valente,Mágno Sávio Ferreira; Viana,José Marcelo Soriano; Resende,Marcos Deon Vilela de; Silva,Fabyano Fonseca e; Lopes,Maria Teresa Gomes. Resumo O objetivo deste trabalho foi avaliar a eficiência da seleção genômica em diferentes cenários de estrutura populacional em milho-pipoca, com estimação dos efeitos e uso de marcadores na própria população de referência e em populações não relacionadas, e determinar a influência do tamanho efetivo e das relações de parentesco na população de estimação sobre a acurácia da predição. Foram simuladas populações com diferentes desequilíbrios de ligação (LD) e variâncias aditivas, tendo-se considerado diferentes caracteres, densidades de marcadores, herdabilidades e gerações, no total de 144 cenários. Também foram simuladas populações estruturadas em progênies. A acurácia da predição dos valores genéticos aditivos foi obtida por meio da correlação entre os... Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Acurácia da predição; Eficiência da seleção genômica; Predição de valor genético; Relação de parentesco; Tamanho efetivo. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016001101857 Métodos de análise de dados longitudinais para o melhoramento genético da pinha PAB Mariguele,Keny Henrique; Resende,Marcos Deon Vilela de; Viana,José Marcelo Soriano; Silva,Fabyano Fonseca e; Silva,Paulo Sérgio Lima de; Knop,Filipe de Castro. O objetivo deste trabalho foi comparar formas de análise de medidas repetidas para o melhoramento da produção de frutos de pinha (Annona squamosa). Vinte progênies de meias-irmãs foram avaliadas por três anos (2003, 2004 e 2005) em delineamento de blocos ao acaso, com cinco repetições, com cada parcela constituída de quatro plantas. A característica avaliada foi o número de frutos por indivíduo. Os modelos de simetria composta, de simetria composta com variâncias heterogêneas, autorregressivo com variâncias heterogêneas, e antedependência estruturada, foram analisados com o programa ASReml. A estimação dos componentes de variância e a predição dos valores genéticos foram feitas com o procedimento REML/BLUP. A comparação dos modelos foi realizada pelo teste... Tipo: Info:eu-repo/semantics/article Palavras-chave: Annona squamosa; Akaike; Matriz de variância e covariância; Medidas repetidas; REML/BLUP; Valores genéticos. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011001200011 Seleção recorrente recíproca na obtenção de híbridos interpopulacionais de milho-pipoca PAB Faria,Vinícius Ribeiro; Viana,José Marcelo Soriano; Sobreira,Fábio Moreira; Silva,Admilson Costa e. O objetivo deste trabalho foi avaliar a eficiência da seleção recorrente recíproca em produzir híbridos de milho-pipoca (Zea mays) de progênies endógamas superiores, com famílias de irmãos-completos. O programa de seleção recorrente recíproca envolveu as populações de milho-pipoca 'Viçosa' e 'Beija-Flor'. Os testes dos híbridos S0xS0 e S1xS1 foram conduzidos em delineamento látice, nos anos agrícolas de 2002/2003 e 2004/2005. Os dois ensaios incluíram testemunhas comerciais comuns, que permitiram a comparação do desempenho dos híbridos. Analisaram-se a produtividade e a capacidade de expansão. Foram preditos ganhos direto e indireto com a seleção em capacidadede expansão, avaliada em pipoqueira de ar quente e na pipocadora "Metric Weight Volume Tester". Os... Tipo: Info:eu-repo/semantics/article Palavras-chave: Famílias de irmãos-completos interpopulacionais; Ganho genético; Métododos híbridos crípticos. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001200015 Adaptabilidade e estabilidade de híbridos de famílias endogâmicas de milho, obtidos pelo método dos híbridos crípticos PAB Lopes,Maria Teresa Gomes; Viana,José Marcelo Soriano; Lopes,Ricardo. Neste trabalho avaliou-se o comportamento de híbridos de famílias endogâmicas de milho obtidos pelo método dos híbridos crípticos, produzidos pelo programa de melhoramento de milho do Departamento de Biologia da UFV. A caracterização dos híbridos foi feita com base em 22 ambientes, usando-se os métodos de Eberhart & Russell e de Carneiro. Pelo método de Eberhart & Russell, foram identificados 15 híbridos com produção acima da média geral. Entre eles, 53,3% tiveram bom desempenho em qualquer ambiente, e alta estabilidade (84-6, 86-1, 86-19, 86-11, 86-15, 86-21, 86-27 e 86-10), e 20% são mais responsivos à melhoria ambiental e possuem alta estabilidade (86-22, 85-2 e 84-5). Os híbridos 85-1, 85-3 e 86-2 apresentaram bom desempenho em qualquer... Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Métodos de melhoramento; Seleção; Adaptação. Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000300012 Breeding strategies for recurrent selection of maize PAB Viana,José Marcelo Soriano. The objectives of this work were to analyze theoretical genetic gains of maize due to recurrent selection among full-sib and half-sib families, obtained by Design I, Full-Sib Design and Half-Sib Design, and genotypic variability and gene loss with long term selection. The designs were evaluated by simulation, based on average estimated gains after ten selection cycles. The simulation process was based on seven gene systems with ten genes (with distinct degrees of dominance), three population classes (with different gene frequencies), under three environmental conditions (heritability values), and four selection strategies. Each combination was repeated ten times, amounting to 25, 200 simulations. Full-sib selection is generally more efficient than half-sib... Tipo: Info:eu-repo/semantics/article Palavras-chave: Design I; Full-sib families; Half-sib families; Tandem selection; Genetic gains. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007001000003 Adaptabilidade e estabilidade de populações de milho-pipoca relacionadas por ciclos de seleção PAB Faria,Vinícius Ribeiro; Viana,José Marcelo Soriano; Mundim,Gabriel Borges; Silva,Admilson da Costa e; Câmara,Tassiano Maxwell Marinho. Os objetivos deste trabalho foram estimar os parâmetros de adaptabilidade e estabilidade em populações de milho-pipoca relacionadas por ciclos de seleção, inferir sobre a eficiência dos métodos de seleção pelos quais as populações foram obtidas e avaliar os efeitos da seleção sobre os parâmetros de adaptabilidade e estabilidade. Vinte e cinco populações e três testemunhas comerciais foram avaliadas em 14 ensaios realizados nos anos agrícolas de 2003/2004, 2004/2005, 2006/2007, 2008/2009 e 2009/2010, em sete locais. Utilizou-se o delineamento experimental de blocos completos ao acaso, com quatro repetições. Foram analisadas a capacidade de expansão, avaliada em forno de microondas e na pipocadora Metric Weight Volume Tester (MWVT), além da produtividade de... Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Interação genótipo x ambiente; Ganhos genéticos. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001200009 Analysis of experiments in square lattice with emphasis on variance components. i. Individual analysis PAB Silva,Heyder Diniz; Regazzi,Adair José; Cruz,Cosme Damião; Viana,José Marcelo Soriano. This paper focused on four alternatives of analysis of experiments in square lattice as far as the estimation of variance components and some genetic parameters are concerned: 1) intra-block analysis with adjusted treatment and blocks within unadjusted repetitions; 2) lattice analysis as complete randomized blocks; 3) intrablock analysis with unadjusted treatment and blocks within adjusted repetitions; 4) lattice analysis as complete randomized blocks, by utilizing the adjusted means of treatments, obtained from the analysis with recovery of interblock information, having as mean square of the error the mean effective variance of this same analysis with recovery of inter-block information. For the four alternatives of analysis, the estimators and estimates... Tipo: Info:eu-repo/semantics/article Palavras-chave: Experimental design; Genetic parameters; Plant breeding. Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999001000007 Quantitative genetics theory for genomic selection and efficiency of genotypic value prediction in open-pollinated populations Scientia Agricola Viana,José Marcelo Soriano; Piepho,Hans-Peter; Silva,Fabyano Fonseca e. ABSTRACT: Quantitative genetics theory for genomic selection has mainly focused on additive effects. This study presents quantitative genetics theory applied to genomic selection aiming to prove that prediction of genotypic value based on thousands of single nucleotide polymorphisms (SNPs) depends on linkage disequilibrium (LD) between markers and QTLs, assuming dominance and epistasis. Based on simulated data, we provided information on dominance and genotypic value prediction accuracy, assuming mass selection in an open-pollinated population, all quantitative trait loci (QTLs) of lower effect, and reduced sample size. We show that the predictor of dominance value is proportional to the square of the LD value and to the dominance deviation for each QTL... Tipo: Info:eu-repo/semantics/article Palavras-chave: Genome-wide selection; Dominance value prediction; Prediction accuracy. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100041 Triple categorical regression for genomic selection: application to cassava breeding Scientia Agricola Lima,Leísa Pires; Azevedo,Camila Ferreira; Resende,Marcos Deon Vilela de; Silva,Fabyano Fonseca e; Viana,José Marcelo Soriano; Oliveira,Eder Jorge de. ABSTRACT: Genome-wide selection (GWS) is currently a technique of great importance in plant breeding, since it improves efficiency of genetic evaluations by increasing genetic gains. The process is based on genomic estimated breeding values (GEBVs) obtained through phenotypic and dense marker genomic information. In this context, GEBVs of N individuals are calculated through appropriate models, which estimate the effect of each marker on phenotypes, allowing the early identification of genetically superior individuals. However, GWS leads to statistical challenges, due to high dimensionality and multicollinearity problems. These challenges require the use of statistical methods to approach the regularization of the estimation process. Therefore, we aimed to... Tipo: Info:eu-repo/semantics/article Palavras-chave: G-BLUP; BLASSO; Genomic prediction; Genomic heritability. Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001500368 Registros recuperados: 28 Primeira ... 1 2 ... Última

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