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| Borba,Tereza Cristina de Oliveira; Brondani,Rosana Pereira Vianello; Breseghello,Flávio; Coelho,Alexandre Siqueira Guedes; Mendonça,João Antônio; Rangel,Paulo Hideo Nakano; Brondani,Claudio. |
| Association analysis was applied to a panel of accessions of Embrapa Rice Core Collection (ERiCC) with 86 SSR and field data from two experiments. A clear subdivision between lowland and upland accessions was apparent, thereby indicating the presence of population structure. Thirty-two accessions with admixed ancestry were identified through structure analysis, these being discarded from association analysis, thus leaving 210 accessions subdivided into two panels. The association of yield and grain-quality traits with SSR was undertaken with a mixed linear model, with markers and subpopulation as fixed factors, and kinship matrix as a random factor. Eight markers from the two appraised panels showed significant association with four different traits,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Association analysis; Core collection; Genetic structure. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000300023 |
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| Breseghello,Flávio; Morais,Orlando Peixoto de; Rangel,Paulo Hideo Nakano. |
| The genetic gain obtained by breeding programs to improve quantitative traits may be estimated by using data from regional trials. A new statistical method for this estimate is proposed and includes four steps: a) joint analysis of regional trial data using a generalized linear model to obtain adjusted genotype means and covariance matrix of these means for the whole studied period; b) calculation of the arithmetic mean of the adjusted genotype means, exclusively for the group of genotypes evaluated each year; c) direct year comparison of the arithmetic means calculated, and d) estimation of mean genetic gain by regression. Using the generalized least squares method, a weighted estimate of mean genetic gain during the period is calculated. This method... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000400024 |
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| Pereira,José Almeida; Morais,Orlando Peixoto de; Breseghello,Flávio. |
| O objetivo deste trabalho foi avaliar, por meio de análise dialélica, o potencial de dez variedades de arroz-vermelho para a implementação de um programa de melhoramento. A identificação de genitores foi feita com dez variedades, em um cruzamento dialélico completo sem recíprocos. As variedades e seus 45 cruzamentos foram avaliados nas gerações F1 e F3, quanto às suas características agronômicas, em delineamento em blocos ao acaso. Para o caráter produção de grãos, foram avaliados: a heterose do cruzamento (H), o efeito varietal (v), a heterose média (h), a heterose varietal (h) e a heterose específica (s) em cada geração, além da capacidade geral de combinação (g) dos genitores. Foram detectadas diferenças significativas entre as variedades genitoras,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Arroz-da-terra; Capacidade de combinação; Melhoramento de arroz; Vigor híbrido. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000900006 |
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| Morais Júnior,Odilon Peixoto de; Melo,Patrícia Guimarães Santos; Morais,Orlando Peixoto de; Castro,Adriano Pereira de; Breseghello,Flávio; Utumi,Marley Marico; Pereira,José Almeida; Wruck,Flávio Jesus; Colombari Filho,José Manoel. |
| Periodic assessment of the genetic progress made in recurrent selection programs is essential for assessing the evolution of the programs and identifying the main factors that have contributed to this progress. This study aimed to estimate genetic progress in grain yield, plant height and days-to-flowering achieved in the CNA6 population of upland rice (Oryza sativa L.), after four cycles of recurrent selection; and evaluate the genetic potential of this population to generate superior inbred lines after each selection cycle. The experimental data were obtained from progeny yield trials of each recurrent selection cycle. These trials were carried out in two or three locations per cycle, and consisted of S0:2 progenies and at least three checks. Federer’s... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: BLUE; BLUP; Mixed model; Population breeding. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400297 |
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