Combining ability of twelve maize populations

Detalhes bibliográficos
Autor(a) principal: Vacaro, Elton
Data de Publicação: 2002
Outros Autores: Barbosa Neto, Jose Fernandes, Pegoraro, Diego Girardi, Nuss, Claudio Natalino, Conceicao, Leo Duc Haa Carson Schwartzhaupt da
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/95421
Resumo: Genetic progress depends on germplasm quality and breeding methods. Twelve maize populations and their crosses were evaluated to estimate combining ability and potential to be included as source populations in breeding programs. Plant height, point of insertion of the first ear, number of ears per plant, number of grains per ear, root and stalk lodging and grain yield were studied in two locations in Brazil, during the 1997/98 season. Genotype sum of squares was divided into general (GCA) and specific (SCA) combining ability. Results indicated the existence of genetic divergence for all traits analyzed, where additive effects were predominant. The high heterosis levels observed, mainly in Xanxerê, suggested the environmental influence on the manifestation of this genetic phenomenon. Populations revealed potential to be used in breeding programs; however, those more intensively submitted to selection could provide larger genetic progress, showing the importance of population improvement for the increment of the heterosis in maize.
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spelling Vacaro, EltonBarbosa Neto, Jose FernandesPegoraro, Diego GirardiNuss, Claudio NatalinoConceicao, Leo Duc Haa Carson Schwartzhaupt da2014-05-20T02:04:54Z20020100-204Xhttp://hdl.handle.net/10183/95421000311293Genetic progress depends on germplasm quality and breeding methods. Twelve maize populations and their crosses were evaluated to estimate combining ability and potential to be included as source populations in breeding programs. Plant height, point of insertion of the first ear, number of ears per plant, number of grains per ear, root and stalk lodging and grain yield were studied in two locations in Brazil, during the 1997/98 season. Genotype sum of squares was divided into general (GCA) and specific (SCA) combining ability. Results indicated the existence of genetic divergence for all traits analyzed, where additive effects were predominant. The high heterosis levels observed, mainly in Xanxerê, suggested the environmental influence on the manifestation of this genetic phenomenon. Populations revealed potential to be used in breeding programs; however, those more intensively submitted to selection could provide larger genetic progress, showing the importance of population improvement for the increment of the heterosis in maize.O progresso genético depende da qualidade do germoplasma e dos métodos de melhoramento empregados. Neste trabalho foram avaliadas doze populações de milho e seus cruzamentos para avaliar suas capacidades combinatórias e seu potencial de inclusão em programas de melhoramento de milho no sul do Brasil. A estatura de planta, ponto de inserção da primeira espiga, número de espigas por planta, número de grãos por espiga, acamamento, quebramento e rendimento de grãos foram avaliados em dois locais, em 1997/98. A soma de quadrados de genótipos foi dividida em capacidade geral (CGC) e específica (CEC) de combinação. Os resultados indicaram a existência de variabilidade genética em todas as características analisadas, em que os efeitos aditivos foram predominantes. Os altos níveis de heterose observados, principalmente em Xanxerê, sugerem forte influência ambiental na manifestação deste fenômeno genético. As populações revelaram potencial para serem utilizadas em programas de melhoramento; entretanto, aquelas que sofreram seleção prévia mais intensa poderiam proporcionar progresso genético maior, demonstrando, assim, a importância do melhoramento de populações para o incremento da heterose em milho.application/pdfengPesquisa Agropecuária Brasileira: 1977. Brasília. Vol. 37, n. 1 (fev. 2002), p. 67-72MilhoMelhoramento genético vegetalComportamento de variedadeVariação genéticaGermoplasmaVigor hibridovariação genéticaheterosegermoplasmaZea maysCombining ability of twelve maize populationsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000311293.pdf000311293.pdfTexto completo (inglês)application/pdf143967http://www.lume.ufrgs.br/bitstream/10183/95421/1/000311293.pdf0f7903aab3b06b7ef64064d1b1aab369MD51TEXT000311293.pdf.txt000311293.pdf.txtExtracted Texttext/plain21994http://www.lume.ufrgs.br/bitstream/10183/95421/2/000311293.pdf.txt0c991ae09e056528cb862d64fa0dcbd6MD52THUMBNAIL000311293.pdf.jpg000311293.pdf.jpgGenerated Thumbnailimage/jpeg1807http://www.lume.ufrgs.br/bitstream/10183/95421/3/000311293.pdf.jpg1570aeef5d341f5946285910eadfe3c1MD5310183/954212024-04-10 06:32:30.295868oai:www.lume.ufrgs.br:10183/95421Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-04-10T09:32:30Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Combining ability of twelve maize populations
title Combining ability of twelve maize populations
spellingShingle Combining ability of twelve maize populations
Vacaro, Elton
Milho
Melhoramento genético vegetal
Comportamento de variedade
Variação genética
Germoplasma
Vigor hibrido
variação genética
heterose
germoplasma
Zea mays
title_short Combining ability of twelve maize populations
title_full Combining ability of twelve maize populations
title_fullStr Combining ability of twelve maize populations
title_full_unstemmed Combining ability of twelve maize populations
title_sort Combining ability of twelve maize populations
author Vacaro, Elton
author_facet Vacaro, Elton
Barbosa Neto, Jose Fernandes
Pegoraro, Diego Girardi
Nuss, Claudio Natalino
Conceicao, Leo Duc Haa Carson Schwartzhaupt da
author_role author
author2 Barbosa Neto, Jose Fernandes
Pegoraro, Diego Girardi
Nuss, Claudio Natalino
Conceicao, Leo Duc Haa Carson Schwartzhaupt da
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Vacaro, Elton
Barbosa Neto, Jose Fernandes
Pegoraro, Diego Girardi
Nuss, Claudio Natalino
Conceicao, Leo Duc Haa Carson Schwartzhaupt da
dc.subject.por.fl_str_mv Milho
Melhoramento genético vegetal
Comportamento de variedade
Variação genética
Germoplasma
Vigor hibrido
topic Milho
Melhoramento genético vegetal
Comportamento de variedade
Variação genética
Germoplasma
Vigor hibrido
variação genética
heterose
germoplasma
Zea mays
dc.subject.eng.fl_str_mv variação genética
heterose
germoplasma
Zea mays
description Genetic progress depends on germplasm quality and breeding methods. Twelve maize populations and their crosses were evaluated to estimate combining ability and potential to be included as source populations in breeding programs. Plant height, point of insertion of the first ear, number of ears per plant, number of grains per ear, root and stalk lodging and grain yield were studied in two locations in Brazil, during the 1997/98 season. Genotype sum of squares was divided into general (GCA) and specific (SCA) combining ability. Results indicated the existence of genetic divergence for all traits analyzed, where additive effects were predominant. The high heterosis levels observed, mainly in Xanxerê, suggested the environmental influence on the manifestation of this genetic phenomenon. Populations revealed potential to be used in breeding programs; however, those more intensively submitted to selection could provide larger genetic progress, showing the importance of population improvement for the increment of the heterosis in maize.
publishDate 2002
dc.date.issued.fl_str_mv 2002
dc.date.accessioned.fl_str_mv 2014-05-20T02:04:54Z
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dc.relation.ispartof.pt_BR.fl_str_mv Pesquisa Agropecuária Brasileira: 1977. Brasília. Vol. 37, n. 1 (fev. 2002), p. 67-72
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