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Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
30/06/2004 |
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Data da última atualização: |
28/08/2018 |
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Autoria: |
RESENDE, R. M. S.; JANK, L.; VALLE, C. B. do. |
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Afiliação: |
ROSANGELA MARIA SIMEAO, CNPGC; LIANA JANK, CNPGC; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
Biometrical analysis and selection of tetraploid progenies of Panicum maximum using mixed model methods. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 39, n. 4, p. 335-341, abr. 2004 |
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Idioma: |
Inglês |
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Notas: |
Título em português: Análise biométrica e seleção de progênies tetraplóides de Panicum maximum usando os métodos de modelos mistos. |
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Conteúdo: |
The objectives of this work were to estimate the genetic and phenotypic parameters and to predict the genetic and genotypic values of the selection candidates obtained from intraspecific crosses in Panicum maximum as well as the performance of the hybrid progeny of the existing and projected crosses. Seventy-nine intraspecific hybrids obtained from artificial crosses among five apomictic and three sexual autotetraploid individuals were evaluated in a clonal test with two replications and ten plants per plot. Green matter yield, total and leaf dry matter yields and leaf percentage were evaluated in five cuts per year during three years. Genetic parameters were estimated and breeding and genotypic values were predicted using the restricted maximum likelihood/best linear unbiased prediction procedure (REML/BLUP). The dominant genetic variance was estimated by adjusting the effect of full-sib families. Low magnitude individual narrow sense heritabilities (0.02-0.05), individual broad sense heritabilities (0.14-0.20) and repeatability measured on an individual basis (0.15-0.21) were obtained. Dominance effects for all evaluated characteristics indicated that breeding strategies that explore heterosis must be adopted. Less than 5% increase in the parameter repeatability was obtained for a three-year evaluation period and may be the criterion to determine the maximum number of years of evaluation to be adopted, without compromising gain per cycle of selection. The identification of hybrid candidates for future cultivars and of those that can be incorporated into the breeding program was based on the genotypic and breeding values, respectively. The prediction of the performance of the hybrid progeny, based on the breeding values of the progenitors, permitted the identification of the best crosses and indicated the best parents to use in crosses. MenosThe objectives of this work were to estimate the genetic and phenotypic parameters and to predict the genetic and genotypic values of the selection candidates obtained from intraspecific crosses in Panicum maximum as well as the performance of the hybrid progeny of the existing and projected crosses. Seventy-nine intraspecific hybrids obtained from artificial crosses among five apomictic and three sexual autotetraploid individuals were evaluated in a clonal test with two replications and ten plants per plot. Green matter yield, total and leaf dry matter yields and leaf percentage were evaluated in five cuts per year during three years. Genetic parameters were estimated and breeding and genotypic values were predicted using the restricted maximum likelihood/best linear unbiased prediction procedure (REML/BLUP). The dominant genetic variance was estimated by adjusting the effect of full-sib families. Low magnitude individual narrow sense heritabilities (0.02-0.05), individual broad sense heritabilities (0.14-0.20) and repeatability measured on an individual basis (0.15-0.21) were obtained. Dominance effects for all evaluated characteristics indicated that breeding strategies that explore heterosis must be adopted. Less than 5% increase in the parameter repeatability was obtained for a three-year evaluation period and may be the criterion to determine the maximum number of years of evaluation to be adopted, without compromising gain per cycle of selection. The identification of... Mostrar Tudo |
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Palavras-Chave: |
guineagrass; herdabilidade; repetibilidade; seleção de genitores; selection of parents. |
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Thesagro: |
Apomixia; Capim Colonião; Melhoramento. |
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Thesaurus NAL: |
apomixis; breeding; heritability; repeatability. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/26685/1/39n04a06.pdf
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Marc: |
LEADER 02859naa a2200301 a 4500
001 1110284
005 2018-08-28
008 2004 bl uuuu u00u1 u #d
100 1 $aRESENDE, R. M. S.
245 $aBiometrical analysis and selection of tetraploid progenies of Panicum maximum using mixed model methods.
260 $c2004
500 $aTítulo em português: Análise biométrica e seleção de progênies tetraplóides de Panicum maximum usando os métodos de modelos mistos.
520 $aThe objectives of this work were to estimate the genetic and phenotypic parameters and to predict the genetic and genotypic values of the selection candidates obtained from intraspecific crosses in Panicum maximum as well as the performance of the hybrid progeny of the existing and projected crosses. Seventy-nine intraspecific hybrids obtained from artificial crosses among five apomictic and three sexual autotetraploid individuals were evaluated in a clonal test with two replications and ten plants per plot. Green matter yield, total and leaf dry matter yields and leaf percentage were evaluated in five cuts per year during three years. Genetic parameters were estimated and breeding and genotypic values were predicted using the restricted maximum likelihood/best linear unbiased prediction procedure (REML/BLUP). The dominant genetic variance was estimated by adjusting the effect of full-sib families. Low magnitude individual narrow sense heritabilities (0.02-0.05), individual broad sense heritabilities (0.14-0.20) and repeatability measured on an individual basis (0.15-0.21) were obtained. Dominance effects for all evaluated characteristics indicated that breeding strategies that explore heterosis must be adopted. Less than 5% increase in the parameter repeatability was obtained for a three-year evaluation period and may be the criterion to determine the maximum number of years of evaluation to be adopted, without compromising gain per cycle of selection. The identification of hybrid candidates for future cultivars and of those that can be incorporated into the breeding program was based on the genotypic and breeding values, respectively. The prediction of the performance of the hybrid progeny, based on the breeding values of the progenitors, permitted the identification of the best crosses and indicated the best parents to use in crosses.
650 $aapomixis
650 $abreeding
650 $aheritability
650 $arepeatability
650 $aApomixia
650 $aCapim Colonião
650 $aMelhoramento
653 $aguineagrass
653 $aherdabilidade
653 $arepetibilidade
653 $aseleção de genitores
653 $aselection of parents
700 1 $aJANK, L.
700 1 $aVALLE, C. B. do
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 39, n. 4, p. 335-341, abr. 2004
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Embrapa Unidades Centrais (AI-SEDE) |
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