The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen

Detalhes bibliográficos
Autor(a) principal: Guedes, Fernando Lisboa
Data de Publicação: 2015
Outros Autores: Ferreira Junior, Edivaldo José, Castro, Carlos Eduardo Caixeta de, Pereira, Carlos Henrique, Prado, Paulo Eduardo Rodrigues, Souza, João Cândido de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/38034
Resumo: The purpose of this study was to evaluate the performance of maize hybrids synthesized from contrasting genotypes with regard to the use of nitrogen that were selected for their performance in topcrosses. Sixty-seven S0:1 progenies derived from the germplasm bank of Ufla were evaluated in topcross combinations with two testers at two nitrogen levels. The six progenies with the greatest tolerance and responsiveness to nitrogen (RT) and the five with the least tolerance and responsiveness (RnTn) were selected and, were, afterwards, crossed in a complete diallel, for a total of 55 hybrid combinations. The following genetic parameters were estimated: genetic variance among the hybrids ( ), broad sense heritability in the mean of the hybrids, and selective accuracy ( ). It was observed that the genetic parameters were greater in the environments with available nitrogen and that the early selection by performance in topcrosses of progenies tolerant to low N levels may not be made with high intensity. The hybrids tolerant to low N levels were obtained by crossing contrasting parents.
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spelling The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogenComportamento de híbridos de milho sintetizados a partir de progênies contrastantes em relação ao o uso do nitrogênioPlant breedingAbiotic stressMaize - HybridsMelhoramento de plantasEstresse abióticoMilho - HíbridosThe purpose of this study was to evaluate the performance of maize hybrids synthesized from contrasting genotypes with regard to the use of nitrogen that were selected for their performance in topcrosses. Sixty-seven S0:1 progenies derived from the germplasm bank of Ufla were evaluated in topcross combinations with two testers at two nitrogen levels. The six progenies with the greatest tolerance and responsiveness to nitrogen (RT) and the five with the least tolerance and responsiveness (RnTn) were selected and, were, afterwards, crossed in a complete diallel, for a total of 55 hybrid combinations. The following genetic parameters were estimated: genetic variance among the hybrids ( ), broad sense heritability in the mean of the hybrids, and selective accuracy ( ). It was observed that the genetic parameters were greater in the environments with available nitrogen and that the early selection by performance in topcrosses of progenies tolerant to low N levels may not be made with high intensity. The hybrids tolerant to low N levels were obtained by crossing contrasting parents.O objetivo deste estudo foi avaliar o desempenho de híbridos de milho, selecionados pelo seu desempenho em topcrosses e sintetizados a partir de genitores contrastantes em relação ao uso do nitrogênio. Sessenta e sete progênies S0:1 derivadas do banco de germoplasma da Ufla, foram avaliadas em combinações de topcross com dois testadores em dois níveis de nitrogênio. As seis progênies com maior tolerância e responsividade ao N (RT) e as cinco não tolerantes e não responsivas ao N (RnTn) foram selecionadas e posteriormente cruzadas em esquema de dialelo completo, resultando em 55 combinações híbridas. Os seguintes parâmetros genéticos foram estimados: variância genética entre os híbridos ( ), herdabilidade em sentido amplo na média dos híbridos e acurácia seletiva ( ). Observou-se que os parâmetros genéticos foram maiores nos ambientes com disponibilidade de nitrogênio e que a seleção precoce com base no desempenho de híbridos topcrosses oriundos de progênies tolerantes a baixos níveis de N não pode ser feita com alta intensidade. Os híbridos tolerantes a baixos níveis de N foram obtidos pelo cruzamento de pais contrastantes.Universidade Estadual de Maringá2019-12-06T10:34:18Z2019-12-06T10:34:18Z2015-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfGUEDES, F. L. et al. The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen. Acta Scientiarum. Agronomy, Maringá, v. 37, n. 1, p. 45-50, Jan./Mar. 2015.http://repositorio.ufla.br/jspui/handle/1/38034Acta Scientiarum. Agronomyreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessGuedes, Fernando LisboaFerreira Junior, Edivaldo JoséCastro, Carlos Eduardo Caixeta dePereira, Carlos HenriquePrado, Paulo Eduardo RodriguesSouza, João Cândido deeng2019-12-06T10:34:19Zoai:localhost:1/38034Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2019-12-06T10:34:19Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen
Comportamento de híbridos de milho sintetizados a partir de progênies contrastantes em relação ao o uso do nitrogênio
title The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen
spellingShingle The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen
Guedes, Fernando Lisboa
Plant breeding
Abiotic stress
Maize - Hybrids
Melhoramento de plantas
Estresse abiótico
Milho - Híbridos
title_short The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen
title_full The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen
title_fullStr The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen
title_full_unstemmed The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen
title_sort The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen
author Guedes, Fernando Lisboa
author_facet Guedes, Fernando Lisboa
Ferreira Junior, Edivaldo José
Castro, Carlos Eduardo Caixeta de
Pereira, Carlos Henrique
Prado, Paulo Eduardo Rodrigues
Souza, João Cândido de
author_role author
author2 Ferreira Junior, Edivaldo José
Castro, Carlos Eduardo Caixeta de
Pereira, Carlos Henrique
Prado, Paulo Eduardo Rodrigues
Souza, João Cândido de
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Guedes, Fernando Lisboa
Ferreira Junior, Edivaldo José
Castro, Carlos Eduardo Caixeta de
Pereira, Carlos Henrique
Prado, Paulo Eduardo Rodrigues
Souza, João Cândido de
dc.subject.por.fl_str_mv Plant breeding
Abiotic stress
Maize - Hybrids
Melhoramento de plantas
Estresse abiótico
Milho - Híbridos
topic Plant breeding
Abiotic stress
Maize - Hybrids
Melhoramento de plantas
Estresse abiótico
Milho - Híbridos
description The purpose of this study was to evaluate the performance of maize hybrids synthesized from contrasting genotypes with regard to the use of nitrogen that were selected for their performance in topcrosses. Sixty-seven S0:1 progenies derived from the germplasm bank of Ufla were evaluated in topcross combinations with two testers at two nitrogen levels. The six progenies with the greatest tolerance and responsiveness to nitrogen (RT) and the five with the least tolerance and responsiveness (RnTn) were selected and, were, afterwards, crossed in a complete diallel, for a total of 55 hybrid combinations. The following genetic parameters were estimated: genetic variance among the hybrids ( ), broad sense heritability in the mean of the hybrids, and selective accuracy ( ). It was observed that the genetic parameters were greater in the environments with available nitrogen and that the early selection by performance in topcrosses of progenies tolerant to low N levels may not be made with high intensity. The hybrids tolerant to low N levels were obtained by crossing contrasting parents.
publishDate 2015
dc.date.none.fl_str_mv 2015-01
2019-12-06T10:34:18Z
2019-12-06T10:34:18Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv GUEDES, F. L. et al. The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen. Acta Scientiarum. Agronomy, Maringá, v. 37, n. 1, p. 45-50, Jan./Mar. 2015.
http://repositorio.ufla.br/jspui/handle/1/38034
identifier_str_mv GUEDES, F. L. et al. The behavior of maize hybrids generated from contrasting progenies regarding the use of nitrogen. Acta Scientiarum. Agronomy, Maringá, v. 37, n. 1, p. 45-50, Jan./Mar. 2015.
url http://repositorio.ufla.br/jspui/handle/1/38034
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
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
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
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