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This study aimed to estimate and compare parameters of adaptability and stability for maize grain yield in a variety of environments by different projection methods. Data from experiments on 36 maize genotypes, in simple lattice 6x6, in 2012/13 season performed at nine growing locations in central Brazil were used. Adaptability and stability analyses were performed using the methods of Lin & Binns (1988) with decomposition, MHPRVG through REML/BLUP, AMMI-Biplot, and GGE-Biplot analysis. These methods have similarities in terms of genotype ordering but differ in precision and amount of information provided on genotype-environment (GxE) interactions. When compared to GGE-Biplot, AMMI method retained a good percentage of the total square sum, based on pattern of GxE interaction. The method of Lin & Binns with decomposition is similar to MHPRVG, but these one is more accurate, practice and informative. MHPRVG and GGE-Biplot methods should be used together to select the most promising genotypes. The genotypes G5 and G8 can be recommended for cultivation in central Brazil due to their adaptability, stability, and yield.

Made available in DSpace on 2015-02-02T12:39:38Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-06-01Bitstream added on 2015-02-02T13:07:44Z : No. of bitstreams: 1 S0100-204X2014000600483.pdf: 542009 bytes, checksum: 0214e0b52034e42525e799ce87b97f5f (MD5) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) O objetivo deste trabalho foi avaliar a influência da competição intergenotípica em famílias de polinização aberta de Eucalyptus e o seu efeito na eficiência da seleção precoce. Foram realizados dois experimentos, nos quais o volume de madeira foi avaliado em três idades, em delineamento de blocos ao acaso. Dados dos três anos de avaliação (experimento 1, aos 2, 4 e 7 anos; e experimento 2, aos 3, 5 e 7 anos) foram analisados a partir de modelos mistos. Foram estimados: componentes de variância, parâmetros genéticos, ganhos com a seleção, número efetivo, eficiência da seleção precoce, ganho com a seleção por unidade de tempo e coincidência de seleção com e sem uso de covariáveis de competição. O efeito da competição não foi significativo em idades inferiores a três anos, e o ajuste por covariáveis de competição foi desnecessário. A seleção precoce para famílias é eficiente; famílias de hábitos de crescimento tardio são mais vulneráveis à competição, o que prejudica de forma mais pronunciada a sua classificação ao final do ciclo. A seleção precoce mostra-se eficiente de acordo com todos os critérios adotados, e a idade em torno de três anos é a mais recomendada, em razão da alta eficiência e do alto índice de acerto na indicação de árvores e famílias. A adição de covariáveis de competição ao final do ciclo melhora a eficiência da seleção precoce para quase todos os critérios estudados. The objetive of this work was to evaluate the influence of intergenotypic competition in open-pollinated families of Eucalyptus and its effects on early selection efficiency. Two experiments were carried out, in which the timber volume was evaluated at three ages, in a randomized complete block design. Data from the three years of evaluation (experiment 1, at 2, 4, and 7 years; and experiment 2, at 2, 5, and 7 years) were analyzed using mixed models. The following were estimated: variance components, genetic parameters, selection gains, effective number, early selection efficiency, selection gain per unit time, and coincidence of selection with and without the use of competition covariates. Competition effect was nonsignificant for ages under three years, and adjustment using competition covariates was unnecessary. Early selection for families is effective; families that have a late growth spurt are more vulnerable to competition, which markedly impairs ranking at the end of the cycle. Early selection is efficient according to all adopted criteria, and the age of around three years is the most recommended, given the high efficiency and accuracy rate in the indication of trees and families. The addition of competition covariates at the end of the cycle improves early selection efficiency for almost all studied criteria. Universidade Estadual Paulista Júlio de Mesquita Filho Faculdade de Engenharia de Ilha Solteira Unesp Faculdade de Ciências Agrárias e Veterinárias Departamento de Produção Vegetal Unesp FCAV Departamento de Ciências Exatas Arbogen Tecnologia Florestal Universidade Federal da Grande Dourados Faculdade de Ciências Biológicas e Ambientais Universidade Estadual Paulista Júlio de Mesquita Filho Faculdade de Engenharia de Ilha Solteira Unesp Faculdade de Ciências Agrárias e Veterinárias Departamento de Produção Vegetal Unesp FCAV Departamento de Ciências Exatas

Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2013-08-22T19:01:17Z No. of bitstreams: 1 S0103-90162011000600011.pdf: 192456 bytes, checksum: b63940b5623d5eb6342e3da5259b2c61 (MD5) Made available in DSpace on 2013-08-22T19:01:17Z (GMT). No. of bitstreams: 1 S0103-90162011000600011.pdf: 192456 bytes, checksum: b63940b5623d5eb6342e3da5259b2c61 (MD5) Previous issue date: 2011-12-01 Made available in DSpace on 2013-09-30T20:01:08Z (GMT). No. of bitstreams: 2 S0103-90162011000600011.pdf: 192456 bytes, checksum: b63940b5623d5eb6342e3da5259b2c61 (MD5) S0103-90162011000600011.pdf.txt: 35411 bytes, checksum: 948d7e2a6f507ab4a66776d6480c73fe (MD5) Previous issue date: 2011-12-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T13:13:31Z No. of bitstreams: 2 S0103-90162011000600011.pdf: 192456 bytes, checksum: b63940b5623d5eb6342e3da5259b2c61 (MD5) S0103-90162011000600011.pdf.txt: 35411 bytes, checksum: 948d7e2a6f507ab4a66776d6480c73fe (MD5) Made available in DSpace on 2014-05-20T13:13:31Z (GMT). No. of bitstreams: 2 S0103-90162011000600011.pdf: 192456 bytes, checksum: b63940b5623d5eb6342e3da5259b2c61 (MD5) S0103-90162011000600011.pdf.txt: 35411 bytes, checksum: 948d7e2a6f507ab4a66776d6480c73fe (MD5) Previous issue date: 2011-12-01 The effect of competition is an important source of variation in breeding experiments. This study aimed to compare the selection of plants of open-pollinated families of Eucalyptus with and without the use of competition covariables. Genetic values were determined for each family and tree and for the traits height, diameter at breast height and timber volume in a randomized block design, resulting in the variance components, genetic parameters, selection gains, effective size and selection coincidence, with and without the use of covariables. Intergenotypic competition is an important factor of environmental variation. The use of competition covariables generally reduces the estimates of variance components and influences genetic gains in the studied traits. Intergenotypic competition biases the selection of open-pollinated eucalypt progenies, and can result in an erroneous choice of superior genotypes; the inclusion of covariables in the model reduces this influence. UFPI CPCE Depto. de Engenharias UNESP FCAV Depto. de Produção Vegetal UNESP FCAV Depto. de Ciências Exatas UENF Lab. de Melhoramento Genético Vegetal Fibria S/A Celulose UNESP FCAV Depto. de Produção Vegetal UNESP FCAV Depto. de Ciências Exatas