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Análise da interação genótipo X ambiente assistida por marcadores moleculares em milho (Zea mays L.).; Genotipe x environment interaction analysis assisted by molecular markers in maize (Zea mays L.).

Rumin, Glauce Cristina Ricardo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 02/05/2005 Português
Relevância na Pesquisa
116.03%
A produtividade de grãos em milho é um caráter altamente complexo e muito dependente das condições ambientais. Neste trabalho de pesquisa, buscouse identificar regiões cromossômicas relacionadas à produtividade de grãos em milho por meio de análises de regressão múltipla stepwise, em vários ambientes. Os dados genotípicos advém da genotipagem de linhagens S2 por 163 locos RFLP, enquanto os dados fenotípicos foram obtidos de experimentos com repetições instalados em 11 locais distintos, nos quais foram avaliados os topcrosses das linhagens com quatro testadores diferentes. Foram selecionadas marcas associadas ao caráter nos diferentes ambientes, posteriormente comparadas a fim de verificar a consistência na expressão de genes das regiões detectadas. De maneira geral, observou-se que a maioria delas é ambiente-específica. Após a seleção das marcas, foi aplicado um índice de seleção de linhagens, baseado nos valores bj da regressão múltipla. O índice é composto pelo valor próprio das linhagens em topcrosses e por uma medida da complementaridade genotípica entre linhagens. As melhores linhagens, segundo o índice de seleção, foram agrupadas por testador e verificouse que a coincidência de linhagens entre locais variou de 48...

Estudo da interação genótipos x ambientes em algumas características produtivas na raça Nelore; Study of genotypes x environments in some productive traits in Nellore cattle

Ribeiro, Sandra
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 30/01/2006 Português
Relevância na Pesquisa
95.98%
O presente estudo teve por objetivo estudar os efeitos da interação genótipos x ambientes sobre as características peso à desmama, peso ao sobreano e ganho de peso da desmama ao sobreano em bovinos de corte da raça Nelore. Foram analisados 45.697 registros de peso à desmama ajustados para 205 dias (PD), 34.773 registros de peso ao sobreano ajustados para 550 dias (PS) e 34.753 registros de ganho de peso da desmama ao sobreano (GP), originários de três fazendas localizadas nas regiões sudeste e centro-oeste do Brasil. Os componentes de variância foram estimados utilizando-se o programa MTDFREML. Os dados foram submetidos a análises de duas formas distintas: primeiramente processaram-se análises de características únicas para os dados de cada fazenda e para conjuntos de dados formados por pares de fazendas. Em seguida, processaram-se análises de características múltiplas, em que a mesma característica foi considerada como variáveis distintas em cada par de fazendas. A partir da obtenção dos valores genéticos dos animais, foram calculadas as diferenças esperadas na progênie (DEPs) dos mesmos, bem como as correlações de Pearson entre os valores das DEPs dos touros para as três características estudadas. As estimativas dos coeficientes de herdabilidade variaram de 0...

Interação genótipo x ambiente via correlações genéticas entre rebanhos e normas de reação utilizando abordagem bayesiana em bovinos de corte; Genotype by environment interaction using genetic correlations between herds and reaction norms under bayesian approach in beef cattle

Ribeiro, Sandra
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 05/03/2010 Português
Relevância na Pesquisa
96.02%
O presente estudo teve por objetivo estudar os efeitos da interação genótipo x ambiente sobre as características peso à desmama, peso ao sobreano e ganho de peso da desmama ao sobreano em bovinos da raça Nelore. Foram analisados 58.032 registros de peso à desmama ajustados para 205 dias (PD), 46.032 registros de peso ao sobreano ajustados para 550 dias (PS) e 45.844 registros de ganho de peso da desmama ao sobreano ajustados para 345 dias (GP), originários de três rebanhos distintos. Os dados foram submetidos a dois métodos de análises: no primeiro, processaram-se análises unicaracterísticas para os rebanhos individuais e para o conjunto formado pelos três rebanhos, e análises tri-características para os dados de cada rebanho, em que as mesmas características foram consideradas como variáveis distintas. Foi utilizado o programa GIBBS2F90, sob abordagem bayesiana. As estimativas dadas pelas médias dos coeficientes de herdabilidade para PD, PS e GP variaram de 0,09 a 0,24, 0,24 a 0,44 e 0,09 a 0,31, respectivamente. Nesta mesma ordem, as correlações genéticas das mesmas características nos diferentes ambientes variaram de 0,88 a 0,93, 0,85 a 0,98 e 0,75 a 0,97. As correlações entre as DEPs dos touros nos ambientes variaram de 0...

Effects of sex and age on genotype x environment interaction for beef cattle body weight studied using reaction norm models

Pegolo, N. T.; Albuquerque, Lucia Galvão de; Lobo, R. B.; Oliveira, Henrique Nunes de
Fonte: Amer Soc Animal Science Publicador: Amer Soc Animal Science
Tipo: Artigo de Revista Científica Formato: 3410-3425
Português
Relevância na Pesquisa
126.07%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); The interest in the effect of genotype x environment interaction is increasing because animal breeding programs have become geographically broader. Climate changes in the next decades are also expected to challenge the present breeding goals, increasing the importance of environmental sensitivity. The aim of this work was to analyze genotype x environment interaction effect on cattle BW using the environmental sensitivity predicted by random regression reaction norm models, including sex and age effects as additional dimensions in the study. Genetic parameters were estimated for adjusted BW of Brazilian Nelore cattle at different ages (120, 210, 365, and 450 d), using linear polynomials for random regression analysis. The analyses with sex as a fixed effect (total analyses) were compared with those with sex-separated progenies (male and female progeny analyses, respectively). (Co)variance components were estimated and breeding values calculated EPD. The results showed important differences in reaction norm model genetic parameter estimates according to different age and sex analyses. The results confirmed the presence of an important genotype x environment x sex x age interaction for Nelore cattle BW. The patterns in these results lead to a revision of the importance of sexual and developmental factors on plasticity and adaptation concepts.

Genotype x environment interaction for age at first calving in Brazilian and Colombian Holsteins

Cerón-Muñoz, M. F.; Tonhati, Humberto; Costa, C. N.; Maldonado-Estrada, J.; Rojas-Sarmiento, D.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 2455-2458
Português
Relevância na Pesquisa
96.03%
The objective was to determine whether there is a genotype x environment interaction for age at first calving (AFC) in Holstein cattle in Brazil and Colombia. Data included 51,239 and 25,569 first-lactation records from Brazil and Colombia, respectively. Of 4230 sires in the data, 530 were North American sires used in both countries. Analyses were done using the REML bi-trait animal model, and AFC was considered as a distinct characteristic in each country. Fixed effects of contemporary group (herd-calving year), sire genetic group, and cow genetic group, and random effects of animal and residual variation were included in the model. Average AFC in Brazil and Colombia were 29.5 ± 4.0 and 32.1 ± 3.5 mo, respectively. Additive and residual genetic components and heritability coefficient for AFC in Brazil were 2.21 mo 2, 9.41 mo 2, and 0.19, respectively, whereas for Colombia, they were 1.02 mo 2, 6.84 mo 2, and 0.13, respectively. The genetic correlation of AFC between Brazil and Colombia was 0.78, indicating differences in ranking of sires consistent with a genotype x environment interaction. Therefore, in countries with differing environments, progeny of Holstein sires may calve at relatively younger or older ages compared with contemporary herdmates in one environment versus another.

Genetic effects on preweaning weight gain of Nelore-Hereford calves according to different models and estimation methods

Carvalheiro, R.; Pimentel, E. C G; Cardoso, V.; Queiroz, S. A.; Friest, L. A.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 2925-2933
Português
Relevância na Pesquisa
86.02%
Additive and nonadditive genetic effects on preweaning weight gain (PWG) of a commercial crossbred population were estimated using different genetic models and estimation methods. The data set consisted of 103,445 records on purebred and crossbred Nelore-Hereford calves raised under pasture conditions on farms located in south, southeast, and middle west Brazilian regions. In addition to breed additive and dominance effects, the models including different epistasis covariables were tested. Models considering joint additive and environment (latitude) by genetic effects interactions were also applied. In a first step, analyses were carried out under animal models. In a second step, preadjusted records were analyzed using ordinary least squares (OLS) and ridge regression (RR). The results reinforced evidence that breed additive and dominance effects are not sufficient to explain the observed variability in preweaning traits of Bos taurus x Bos indicus calves, and that genotype x environment interaction plays an important role in the evaluation of crossbred calves. Data were ill-conditioned to estimate the effects of genotype x environment interactions. Models including these effects presented multicolinearity problems. In this case, RR seemed to be a powerful tool for obtaining more plausible and stable estimates. Estimated prediction error variances and variance inflation factors were drastically reduced...

Genotype×production environment interaction for weaning weight in Angus populations of Brazil and Uruguay

Espasandin, A. C.; Urioste, J. I.; Naya, H.; Alencar, M. M.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 264-270
Português
Relevância na Pesquisa
95.91%
The objective of this study was to define production environments by grouping different environmental factors and, consequently, to assess genotype by production environment interactions on weaning weight (WW) in the Angus populations of Brazil and Uruguay. Climatic conditions were represented by monthly temperature means (°C), minimum and maximum temperatures in winter and summer respectively and accumulated rainfall (mm/year). Mode in month of birth and weaning, and calf weight (kg) and age (days) at weaning were used as indicators of management conditions of 33 and 161 herds in 13 and 34 regions in Uruguay and Brazil, respectively. Two approaches were developed: (a) a bi-character analysis of extreme sub-datasets within each environmental factor (bottom and top 33% of regions), (b) three different production environments (including farms from both countries) were defined in a cluster analysis using standardized environmental factors. To identify the variables that influenced the cluster formation, a discriminant analysis was previously carried out. Management (month, age and weight at weaning) and climatic factors (accumulated rainfalls and winter and summer temperatures) were the most important factors in the clustering of farms. Bi or trivariate analyses were performed to estimate heritability and genetic correlations for WW in extreme sub-datasets within environmental factor or between clusters...

Multivariate analyses of genotype x environment interaction of popcorn

Miranda,Glauco Vieira; Souza,Leandro Vagno de; Guimarães,Lauro José Moreira; Namorato,Heraldo; Oliveira,Lucimar Rodrigues; Soares,Marcelo Oliveira
Fonte: Embrapa Informação Tecnológica; Pesquisa Agropecuária Brasileira Publicador: Embrapa Informação Tecnológica; Pesquisa Agropecuária Brasileira
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2009 Português
Relevância na Pesquisa
86.05%
The objectives of this work were to evaluate the genotype x environment (GxE) interaction for popcorn and to compare two multivariate analyses methods. Nine popcorn cultivars were sown on four dates one month apart during each of the agricultural years 1998/1999 and 1999/2000. The experiments were carried out using randomized block designs, with four replicates. The cv. Zélia contributed the least to the GxE interaction. The cv. Viçosa performed similarly to cv. Rosa-claro. Optimization of GxE was obtained for cv. CMS 42 for a favorable mega-environment, and for cv. CMS 43 for an unfavorable environment. Multivariate analysis supported the results from the method of Eberhart & Russell. The graphic analysis of the Additive Main effects and Multiplicative Interaction (AMMI) model was simple, allowing conclusions to be made about stability, genotypic performance, genetic divergence between cultivars, and the environments that optimize cultivar performance. The graphic analysis of the Genotype main effects and Genotype x Environment interaction (GGE) method added to AMMI information on environmental stratification, defining mega-environments and the cultivars that optimized performance in those mega-environments. Both methods are adequate to explain the genotype x environment interactions.

Genotype x environment interaction of agronomic and processing quality traits in potato

Augustin,Lizete; Milach,Sandra; Bisognin,Dilson Antônio; Suzin,Marilei
Fonte: Associação Brasileira de Horticultura Publicador: Associação Brasileira de Horticultura
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2012 Português
Relevância na Pesquisa
85.97%
At the main crop production region of Rio Grande do Sul state, Brazil, potato is cultivated in two different growing seasons: autumn and spring. The objectives of this research paper were: i) identify potato clones with high yield potential and industrial quality for Autumn and Spring growing seasons in the northern/northeastern region of the state; ii) estimate the effects of environment and of the genotype x environment interaction on the expression of agronomic and processing quality traits of potato clones in order to determine the appropriate strategy for breeding potato for the target region. One hundred and seventy clones of nine families were developed and compared to the cultivars Atlantic, Baronesa, Catucha, Ciclamen, Hertha, Lady Roseta, Macaca, Monalisa and Vivaldi and to the clone SMIJ 461-1, in the autumn and spring of 2006, in Passo Fundo, northern Rio Grande do Sul state. The evaluated traits included number of tubers per plant, tuber weight, plant yield, presence of deep eyes, dry matter content and chip color. Genotype x environment interaction (G x E) was significant for the expression of all traits but processing quality traits like chip color were most influenced by the growing season conditions. Genetic potential expression for yield traits was maximized in the spring season. Superior clones combining agronomic and quality traits were identified at the two growing seasons. High correlation between the two growing seasons was observed for the presence of deep eyes and dry matter...

Combining ability of maize inbred lines evaluated in three environments in Brazil

Nass,Luciano Lourenço; Lima,Marlene; Vencovsky,Roland; Gallo,Paulo Boller
Fonte: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz" Publicador: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2000 Português
Relevância na Pesquisa
85.98%
For tropical areas like Brazil, genotype x environment interaction is an important source of variation. Our objectives were to examine the combining abilities and their interaction with environments in ten selected maize (Zea mays L.) inbred lines in diallel crosses and to identify candidates for promising hybrid combinations. Crosses and checks were evaluated through a 7 x 7 triple lattice design at three locations during the 1984/85 season. Several agronomic traits were evaluated, but here only data on ear yield are discussed. Yield data were adjusted for stand variation (correction to 50 plants per plot) and grain moisture (15.5%). Data for ear yield were analysed using an adaptation of Griffing’s method IV for complete diallel crosses, and experiments were repeated in several environments. The means of the crosses over all environments ranged from 6.6 t/ha to 10.3 t/ha. The combining ability analysis of diallel data across environments showed highly significant (P<0.01) effects for environment, general combining ability (GCA), specific combining ability (SCA), and GCA x environment interaction. The SCA x environment interaction was not significant. Results showed that both GCA and SCA were important for this diallel cross. Considering the 13 hybrids that showed higher yields than the commercial hybrid controls...

Natural selection and family X location interaction in the common (dry) bean plant

Pirola,Luís Henrique; Ramalho,Magno Antonio Patto; Carneiro,José Eustáquio S.; Abreu,Ângela de Fátima Barbosa
Fonte: Sociedade Brasileira de Genética Publicador: Sociedade Brasileira de Genética
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2002 Português
Relevância na Pesquisa
105.94%
Natural selection takes place while advancing generations of segregant populations of self pollinating species by the population (bulk) method. There is evidence that it maintains the individuals with greater grain yield. The question arises whether natural selection preserves the individuals which are more adapted only to the environment where the generation advance occurred, that is, if it contributes to increasing the genotype x environment interaction in the family assessment. This study was carried out to check this hypothesis in the common bean plant using families derived from a segregating population from a cross between the Carioca MG x ESAL 686 cultivars. The segregating populations increase in homozygosity was obtained by the population (bulk) method until the F14 generation, in three distinct locations in Minas Gerais state: Lavras, Lambari and Patos de Minas. Forty-seven F14:15 families were randomly taken from the population in each location and later multiplied to obtain F14:16 families. These families were jointly assessed with three controls using a triple 12 x 12 lattice design in the three locations of generation advance in the wet season of 1998/1999. All the estimated parameters showed that while advancing segregant populations by the population (bulk) method...

Epistasis and genotype-by-environment interaction of grain protein content in durum wheat

Bnejdi,Fethi; Gazzah,Mohamed El
Fonte: Sociedade Brasileira de Genética Publicador: Sociedade Brasileira de Genética
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2010 Português
Relevância na Pesquisa
105.97%
Parental, F1, F2, BC1 and BC2 generations of four crosses involving four cultivars of durum wheat (Triticum durum Desf.) were evaluated at two sites in Tunisia. A three-parameter model was found inadequate for all cases except crosses Chili x Cocorit 71 at site Sidi Thabet and Inrat 69 x Karim at both sites. In most cases a digenic epistatic model was sufficient to explain variation in generation means. Dominance effects (h) and additive x additive epistasis (i) (when significant) were more important than additive (d) effects and other epistatic components. Considering the genotype-by-environment interaction, the non-interactive model (m, d, h, e) was found adequate. Additive variance was higher than environmental variance in three crosses at both sites. The estimated values of narrow-sense heritability were dependent upon the cross and the sites and were 0%-85%. The results indicate that appropriate choice of environment and selection in later generations would increase grain protein content in durum wheat.

Multivariate analyses of genotype x environment interaction of popcorn.

MIRANDA, G.V.; SOUZA, L.V. de; GUIMARÃES, L.J.M.; NAMORATO, H.; OLIVEIRA, L.R.; SOARES, M.O.
Fonte: Pesquisa Agropecuária Brasileira, Brasília, v.44, n. 1, p. 45-50, jan. 2009. Publicador: Pesquisa Agropecuária Brasileira, Brasília, v.44, n. 1, p. 45-50, jan. 2009.
Tipo: Artigo em periódico indexado (ALICE)
Português
Relevância na Pesquisa
86.05%
The objectives of this work were to evaluate the genotype x environment (GxE) interaction for popcorn and to compare two multivariate analyses methods. Nine popcorn cultivars were sown on four dates one month apart during each of the agricultural years 1998/1999 and 1999/2000. The experiments were carried out using randomized block designs, with four replicates. The cv. Zélia contributed the least to the GxE interaction. The cv. Viçosa performed similarly to cv. Rosa-claro. Optimization of GxE was obtained for cv. CMS 42 for a favorable mega-environment, and for cv. CMS 43 for an unfavorable environment. Multivariate analysis supported the results from the method of Eberhart & Russell. The graphic analysis of the Additive Main effects and Multiplicative Interaction (AMMI) model was simple, allowing conclusions to be made about stability, genotypic performance, genetic divergence between cultivars, and the environments that optimize cultivar performance. The graphic analysis of the Genotype main effects and Genotype x Environment interaction (GGE) method added to AMMI information on environmental stratification, defining mega-environments and the cultivars that optimized performance in those mega-environments. Both methods are adequate to explain the genotype x environment interactions.; 2009

Multivariate analyses of genotype x environment interaction of popcorn.

MIRANDA, G. V.; SOUZA, L. V. de; GUIMARAES, L. J. M.; NAMORATO, H.; OLIVEIRA, L. R.; SOARES, M. O.
Fonte: Pesquisa Agropecuária Brasileira, Brasilia, v. 44, n. 1, p. 45-50, 2009. Publicador: Pesquisa Agropecuária Brasileira, Brasilia, v. 44, n. 1, p. 45-50, 2009.
Tipo: Artigo em periódico indexado (ALICE)
Português
Relevância na Pesquisa
85.92%
Os objetivos deste trabalho foram avaliar a interação genótipo x ambiente (GxA) em milho-pipoca e comparar dois métodos de análise multivariada (AMMI e GGE). Os tratamentos foram nove cultivares de milho-pipoca, plantadas em quatro épocas de semeadura em cada ano de cultivo em 1998/1999 e 1999/2000. O delineamento foi em blocos ao acaso, com quatro repetições. A cultivar Zélia foi a que menos contribuiu para a interação GxA. As cultivares Viçosa e Rosa-claro mostraram desempenhos similares. A otimização da interação GxA foi obtida com a cv. CMS 42 para mega-ambientes favoráveis e com a cv. CMS 43 para ambientes desfavoráveis. Os resultados das análises multivariadas corroboraram os resultados do método de Eberhart & Russell. A análise gráfica do método Additive Main effects and Multiplicative Interaction (AMMI) é simples e permite tirar conclusões sobre estabilidade, desempenho genotípico, divergência genética das cultivares, e sobre os ambientes que otimizam o desempenho das cultivares. A análise gráfica do método Genotype main effects and Genotype x Environment interaction (GGE) acrescentou informações de estratificação ambiental ao AMMI e definiu mega-ambientes e as cultivares que tiveram suas performances otimizadas nesses ambientes. Ambos os métodos são adequados para explicar a interação genótipo x ambiente.; 2009

Implicações da interação genótipo por ambiente e divergência genética das linhagens de soja; Implications of genotype by environment interaction and genetic divergence of soybean strains

Rezende, Daniela Freitas
Fonte: Universidade Federal de Uberlândia Publicador: Universidade Federal de Uberlândia
Tipo: Dissertação
Português
Relevância na Pesquisa
96.06%
A seleção de linhagens de soja com elevada produtividade de grãos e capacidade de adaptação a ampla faixa de ambientes é um dos principais objetivos dos programas de melhoramento genético, buscando assim, o conhecimento das linhagens em relação ao caráter na interação Genótipo x Ambiente. Dessa forma, o trabalho foi realizado com os objetivos de verificar a magnitude do efeito de genótipo (G), de ambiente (A) e da interação G x A, e quantificou a divergência genética das linhagens estudadas, usando a distância Euclidiana média padronizada, com o método de Vizinho mais próximo. Os experimentos fazem parte dos ensaios de Valor de Cultivo e Uso do Programa de Melhoramento de soja da Universidade Federal de Uberlândia, que foram conduzidos em oito municípios dos estados de Goiás, Mato Grosso, Bahia e Minas Gerais. O delineamento experimental foi o de blocos ao acaso, com três repetições. Foi avaliado o caráter produtividade de grãos nas safras 2006/07 e 2007/08, e na safra 2007/08, através dos caracteres número de dias para a maturação, altura de plantas na maturação, inserção da primeira vagem, acamamento de plantas, produtividade de grãos, peso de mil sementes, porcentagem de teor de óleo e proteína...

Métodos AMMI, GGE BIPLOT, REML/BLUP e análise de fatores na estabilidade e estratificação de ambientes de safrinha para seleção de híbridos de milho; Methods AMMI, GGEbiplot, REML/BLUP, and Factors Analysis on stability and environment stratification of second harvest for selection of maize hybrids

Martinelli, André Paulo
Fonte: Universidade Federal de Uberlândia Publicador: Universidade Federal de Uberlândia
Tipo: Dissertação
Português
Relevância na Pesquisa
86.08%
O presente estudo foi realizado com objetivos de avaliar os efeitos da interação genótipo x ambiente, adaptabilidade, estabilidade, seleção dos melhores híbridos de milho e estratificar ambientes mais indicados para seleção de genótipos adaptados a safrinha da região Central do Brasil, por meio dos métodos AMMI (Additive Main Effects and Multiplicative Interaction Analysis), GGEbiplot (Genotype and Genotypes by Environment Interaction), AF (Análise de Fatores) e REML/BLUP. Foram utilizados dados da avaliação de produtividade de grãos, provenientes da empresa Dow AgroSciences, referente a 25 híbridos de milho, em 13 locais distribuidos nos estados de Mato Grosso do Sul, Mato Grosso, Goiás e Distrito Federal, em duas safrinhas, 2011 e 2012. Foram realizadas as análises de variância e posteriormente as análises de adaptabilidade e estabilidade. As análises AMMI e GGE biplot associadas aos valores genéticos preditos estimados pela metodologia REML/BLUP permitiram indicação dos melhores híbridos para cultivo em ambientes de safrinha do Brasil Central. Os melhores híbridos para plantio na safrinha no Brasil Central quanto a adaptabilidade e estabilidade foram: H10, H17, H07, H09 e H05. O método REML/BLUP fornece resultados que são interpretados diretamente como valores genotípicos e apresentaram alta coincidência com os dados médios de produtividade de grãos...

Regionaliza????o para o cultivo do feij??o no Rio Grande do Sul com base na intera????o gen??tipo x ambiente.; Common bean cropping regionalization in Rio Grande do Sul State, Brazil, based on genotype x environment interaction.

PIANA, Clause F??tima de Brum
Fonte: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fitomelhoramento; UFPel; BR Publicador: Universidade Federal de Pelotas; Agronomia; Programa de P??s-Gradua????o em Fitomelhoramento; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
Português
Relevância na Pesquisa
96.15%
In Brazil, common bean (Phaseolus vulgaris L.) is cultivated in a range of ecologically differentiated environments. For being a culture highly influenced by the environment variation, its average productivity in the Country is unstable and low. An origin of this variation of productivity is the genotype x environment interaction, which has been one of the largest impediments for obtaining genotypes that maintain consistently high yield in the growing environments. The methods proposed for the exploration of the genotype x environment interaction are directed to the stability of the yield of the genotypes or to the regionalization of the growing locations. Most of the common bean genotypes registered for cultivation in Rio Grande do Sul evidences yield instability. The present research explored data from Rio Grande do Sul Common Bean State Trial ("Ensaio Estadual de Feij??o" - EEF), executed at 24 locations in the period from 1987/88 to 1994/95, with considerable variation of genotypes and locations among those years. This research had two main objectives: (1) to evaluate the magnitude and the nature of the genotype x environment interaction and (2) to identify possible stratification of the growing region of common bean in the State in sub-regions inside of which the genotypes have stable relative performance. The inferences about the components of the interaction genotype x environment were proceeded by the joint analysis of each one of the eight years and the analyses of two subsets of four years and of the set of eight years. Because of the intent of obtaining a long time regionalization...

Desempenho agron??mico de gen??tipos de cana-de-a????car no Estado do Rio Grande do Sul.; Agronomic performance of sugarcane genotypes in Rio Grande do Sul State.

VER??SSIMO, Mario Alvaro Aloisio
Fonte: Universidade Federal de Pelotas; Agricultura familiar; Programa de P??s-Gradua????o em Sistemas de Produ????o Agr??cola Familiar; UFPel; BR Publicador: Universidade Federal de Pelotas; Agricultura familiar; Programa de P??s-Gradua????o em Sistemas de Produ????o Agr??cola Familiar; UFPel; BR
Tipo: Dissertação Formato: application/pdf
Português
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85.96%
Brazil is the world leader in the production of sugarcane. This crop is of great importance to Brazil and to Rio Grande do Sul State, where the family farming has the largest area planted with sugarcane. There is increasing demand for technical information about the sugarcane cultivation in this State, with the aim at ethanol production. Genotype x environment interaction is one of the main factors to be evaluated in the development of the production systems. The objective of this research was to evaluate the agronomic performance of sugarcane genotypes in different environments of the Rio Grande do Sul State. The characters tons of stalks per hectare (TCH), tons of Brix per hectare (TBH), maturation, disease occurrence and cold tolerance of sugarcane genotypes were evaluated. Adaptability and stability was evaluated by methodology AMMI (Additive Main Effects and Multiplicative Interaction), based on the variables TBH and TCH. The results indicate that the genotype x environment interaction is significant, with genotypes broadly adapted and stable, as well as behavior specific genotypes to particular environments. Diseases such as brown rust, smut, leaf scald and red stripe incidence and striations were regionalized. The brown spot (Cercospora longipes) showed wide occurrence with high severity for some genotypes in certain environments. Regarding the cold tolerance...

Study of genotype x environment interaction in progenies of Pinus taeda by analysis of genetic parameters; ESTUDO DA INTERAÇÃO GENÓTIPO X AMBIENTE EM PROGÊNIES DE Pinus taeda POR MEIO DA ANÁLISE DE PARÂMETROS GENÉTICOS

Martinez, Diego Tyszka; UFMT; Resende, Marcos Deon Vilela de; Embrapa; Costa, Reginaldo Brito da; UFMT; Higa, Antonio Rioyei; UFPR; Santos, Gleison Augusto dos; CMPC; Fier, Ivone Satsuki Namikawa; Klabin
Fonte: FUPEF DO PARANÁ Publicador: FUPEF DO PARANÁ
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 01/10/2012 Português
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This study evaluated genetic parameters, heterogeneity of residual variances and genotype x environment interaction, comparing the results obtained by Blup and Blup-Het procedures in Pinus taeda L. progeny tests. Experiments were set in random blocks with 150 treatments. Three experiments were located in Santa Catarina state and two were set in Paraná state, Brazil, with 5 and 9 blocks per site, respectively, and six plants per plot. At 6 years old, the progenies were evaluated for height and diameter. In general, results demonstrated that high residual variance lead to variance heterogeneity. When variances are associated to high genetic correlations among height and diameter characters, they indicate that Blup-Het procedure should be used, even if they present similar results, because genetic parameters estimated based on individual heritability for progeny is more accurate. Genotype x environment interaction was low, given similarities among progeny variance and similarity components, selected by adaptability, stability and productivity criteria. The genetic improvement program may be conducted at one site, due to the environments similarities, as demonstrated by effects from genotype x environment interaction determination coefficient and genetic correlations across sites.;  O presente estudo objetivou avaliar parâmetros genéticos associados à heterogeneidade de variâncias e interação genótipos x ambientes...

Genotype x environment interactions in sugarcane yield trials in the central-western region of venezuela

Rea,Ramón; De Sousa Vieira,Orlando
Fonte: ASOCIACIÓN INTERCIENCIA Publicador: ASOCIACIÓN INTERCIENCIA
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2002 Português
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Summary The presence of genotype by environment (G x E) interaction is a major concern to plant breeders, since large interactions can reduce gains from selection and complicate identification of superior cultivars. The objectives of this study were to determine the relative magnitude of G x E interaction effects and to evaluate phenotypic stability in sugarcane (Saccharum spp. Hybrid) in terms of regression coefficient, mean square deviation from regression, ecovalence, coefficient of determination, and coefficient of variation. Fourteen genotypes and three sugarcane cultivars were evaluated for 2yr at six locations in Venezuela. The genotype x location interaction for cane yield and apparent sucrose content (pol % cane) indicated that genotypes ranked different or changes in the magnitudes of differences between genotypes from one environment to another. The second order interaction was not significant for both traits. The clones B80-549, B80-408, and B81-503 were significantly superior to the rest of genotype for cane yield. B81-509, V84-25, B81-494, and B80-408 had the best performance for pol % cane. This study suggests that the stability analysis can contribute with supplementary information on the performance of new sugarcane selections prior to release for commercial cultivation and can increase the efficiency of cultivar development programs