Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Acta Scientiarum. Agronomy (Online) |
Texto Completo: | http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6605 |
Resumo: | Currently, Brachiaria brizantha Stapf is the tropical grass with the largest cultivated area in Brazil, being responsible for a major part of the seed market and for the increase in animal production. There are several superior genotypes available in germplasm banks, collected from the African continent and in need of evaluation. The selection of these genotypes must be based on predicted genotype values of the individuals in function of being perennial plants and of unsexed propagation. The standard procedure for the prediction of genetic values is the individual BLUP (Best Linear Unbiased Predictor), using estimates of variance components achieved by the restricted maximum likelihood (REML) on an individual model. With the aim of selecting B. brizantha materials superior to the commercial cultivars in relation to the agronomic traits, 218 genotypes were evaluated at four experimental fields belonging to Embrapa Gado de Corte in Campo Grande, MS, Brazil. The fields were evaluated at different times, being that field One was evaluated for three years, and the others for two years. The experimental design used was that of randomized blocks in three replications, with Marandu and Xaraés cultivars as witnesses. Genetic parameters estimated for the characters were: accumulation of dry mass (MST), accumulation of foliar dry matter (MSF), dry green matter (MSV), leaf percentage (F(%)), rebudding (REB) and vigor. It was concluded that two years of measurement are enough for selection, adopting a coefficient of determination of 80%. |
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Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605Avaliação de acessos de Brachiaria brizantha Stapf e estimativas de parâmetros genéticos para caracteres agronômicos - DOI: 10.4025/actasciagron.v31i1.6605genetic correlationtropical forageheritabilityREML/BLUPrepeatabilitygenotypescorrelação genéticagramínea tropicalherdabilidadeREML/BLUPrepetibilidadegenótipos.Currently, Brachiaria brizantha Stapf is the tropical grass with the largest cultivated area in Brazil, being responsible for a major part of the seed market and for the increase in animal production. There are several superior genotypes available in germplasm banks, collected from the African continent and in need of evaluation. The selection of these genotypes must be based on predicted genotype values of the individuals in function of being perennial plants and of unsexed propagation. The standard procedure for the prediction of genetic values is the individual BLUP (Best Linear Unbiased Predictor), using estimates of variance components achieved by the restricted maximum likelihood (REML) on an individual model. With the aim of selecting B. brizantha materials superior to the commercial cultivars in relation to the agronomic traits, 218 genotypes were evaluated at four experimental fields belonging to Embrapa Gado de Corte in Campo Grande, MS, Brazil. The fields were evaluated at different times, being that field One was evaluated for three years, and the others for two years. The experimental design used was that of randomized blocks in three replications, with Marandu and Xaraés cultivars as witnesses. Genetic parameters estimated for the characters were: accumulation of dry mass (MST), accumulation of foliar dry matter (MSF), dry green matter (MSV), leaf percentage (F(%)), rebudding (REB) and vigor. It was concluded that two years of measurement are enough for selection, adopting a coefficient of determination of 80%.Atualmente, a Brachiaria brizantha Stapf é a gramínea forrageira tropical com maior área cultivada, no Brasil, e é responsável por grande parte do mercado de sementes e pelo incremento na produtividade animal. São muitos os genótipos superiores originários do continente africano que estão contidos nos bancos de germoplasma. A seleção dos genótipos mais promissores deve ser realizada com base nos valores genotípicos preditos dos indivíduos. O procedimento-padrão para a predição de valores genéticos é o BLUP individual, usando estimativas de componentes de variância obtidas pelo método de máxima verossimilhança restrita (REML) em um modelo individual. Com o objetivo de selecionar os materiais superiores para características agronômicas, foram avaliados 218 genótipos de B. brizantha distribuídos em quatro campos experimentais na Embrapa Gado de Corte, em Campo Grande, Estado do Mato Grosso do Sul, e por um período mínimo de dois anos. O delineamento utilizado foi o de blocos ao acaso com três repetições e as testemunhas foram as cultivares Marandu e Xaraés. Foram estimados parâmetros genéticos para os caracteres: acúmulo de massa seca (MST), acúmulo de matéria seca foliar (MSF), matéria seca verde (MSV), porcentagem de folha (F(%)), rebrota (REB) e vigor. Concluiu-se que dois anos de medições são suficientes para seleção adotando-se um coeficiente de determinação de 80%.Universidade Estadual de Maringá2009-03-19info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/660510.4025/actasciagron.v31i1.6605Acta Scientiarum. Agronomy; Vol 31 No 1 (2009); 17-22Acta Scientiarum. Agronomy; v. 31 n. 1 (2009); 17-221807-86211679-9275reponame:Acta Scientiarum. Agronomy (Online)instname:Universidade Estadual de Maringá (UEM)instacron:UEMporhttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6605/6605Basso, Kelen CristinaResende, Rosangela Maria SimeãoValle, Cacilda Borges doGonçalves, Manoel CarlosLempp, Beatrizinfo:eu-repo/semantics/openAccess2022-11-23T18:38:18Zoai:periodicos.uem.br/ojs:article/6605Revistahttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgronPUBhttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/oaiactaagron@uem.br||actaagron@uem.br|| edamasio@uem.br1807-86211679-9275opendoar:2022-11-23T18:38:18Acta Scientiarum. Agronomy (Online) - Universidade Estadual de Maringá (UEM)false |
dc.title.none.fl_str_mv |
Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605 Avaliação de acessos de Brachiaria brizantha Stapf e estimativas de parâmetros genéticos para caracteres agronômicos - DOI: 10.4025/actasciagron.v31i1.6605 |
title |
Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605 |
spellingShingle |
Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605 Basso, Kelen Cristina genetic correlation tropical forage heritability REML/BLUP repeatability genotypes correlação genética gramínea tropical herdabilidade REML/BLUP repetibilidade genótipos. |
title_short |
Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605 |
title_full |
Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605 |
title_fullStr |
Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605 |
title_full_unstemmed |
Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605 |
title_sort |
Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605 |
author |
Basso, Kelen Cristina |
author_facet |
Basso, Kelen Cristina Resende, Rosangela Maria Simeão Valle, Cacilda Borges do Gonçalves, Manoel Carlos Lempp, Beatriz |
author_role |
author |
author2 |
Resende, Rosangela Maria Simeão Valle, Cacilda Borges do Gonçalves, Manoel Carlos Lempp, Beatriz |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Basso, Kelen Cristina Resende, Rosangela Maria Simeão Valle, Cacilda Borges do Gonçalves, Manoel Carlos Lempp, Beatriz |
dc.subject.por.fl_str_mv |
genetic correlation tropical forage heritability REML/BLUP repeatability genotypes correlação genética gramínea tropical herdabilidade REML/BLUP repetibilidade genótipos. |
topic |
genetic correlation tropical forage heritability REML/BLUP repeatability genotypes correlação genética gramínea tropical herdabilidade REML/BLUP repetibilidade genótipos. |
description |
Currently, Brachiaria brizantha Stapf is the tropical grass with the largest cultivated area in Brazil, being responsible for a major part of the seed market and for the increase in animal production. There are several superior genotypes available in germplasm banks, collected from the African continent and in need of evaluation. The selection of these genotypes must be based on predicted genotype values of the individuals in function of being perennial plants and of unsexed propagation. The standard procedure for the prediction of genetic values is the individual BLUP (Best Linear Unbiased Predictor), using estimates of variance components achieved by the restricted maximum likelihood (REML) on an individual model. With the aim of selecting B. brizantha materials superior to the commercial cultivars in relation to the agronomic traits, 218 genotypes were evaluated at four experimental fields belonging to Embrapa Gado de Corte in Campo Grande, MS, Brazil. The fields were evaluated at different times, being that field One was evaluated for three years, and the others for two years. The experimental design used was that of randomized blocks in three replications, with Marandu and Xaraés cultivars as witnesses. Genetic parameters estimated for the characters were: accumulation of dry mass (MST), accumulation of foliar dry matter (MSF), dry green matter (MSV), leaf percentage (F(%)), rebudding (REB) and vigor. It was concluded that two years of measurement are enough for selection, adopting a coefficient of determination of 80%. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009-03-19 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6605 10.4025/actasciagron.v31i1.6605 |
url |
http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6605 |
identifier_str_mv |
10.4025/actasciagron.v31i1.6605 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6605/6605 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Estadual de Maringá |
publisher.none.fl_str_mv |
Universidade Estadual de Maringá |
dc.source.none.fl_str_mv |
Acta Scientiarum. Agronomy; Vol 31 No 1 (2009); 17-22 Acta Scientiarum. Agronomy; v. 31 n. 1 (2009); 17-22 1807-8621 1679-9275 reponame:Acta Scientiarum. Agronomy (Online) instname:Universidade Estadual de Maringá (UEM) instacron:UEM |
instname_str |
Universidade Estadual de Maringá (UEM) |
instacron_str |
UEM |
institution |
UEM |
reponame_str |
Acta Scientiarum. Agronomy (Online) |
collection |
Acta Scientiarum. Agronomy (Online) |
repository.name.fl_str_mv |
Acta Scientiarum. Agronomy (Online) - Universidade Estadual de Maringá (UEM) |
repository.mail.fl_str_mv |
actaagron@uem.br||actaagron@uem.br|| edamasio@uem.br |
_version_ |
1750315305319530496 |