| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Gado de Corte. |
|
Data corrente: |
20/07/2004 |
|
Data da última atualização: |
05/06/2007 |
|
Autoria: |
RESENDE, R. M. S.; JANK, L.; VALLE, C. B. do; BONATO, A. N. V. |
|
Afiliação: |
Embrapa Gado de Corte (Campo Grande, MS). |
|
Título: |
Biometrical analysis and selection of tetraploid progenies of Panicum maximum using mixed model methods. |
|
Ano de publicação: |
2004 |
|
Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 39, n. 4, p. 335-341, abr. 2004. |
|
Idioma: |
Inglês |
|
Notas: |
CNPGC.
|
|
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 |
|
Palavras-Chave: |
Colonião; Guineagrass; Herdabilidade; Panicum maximun; Selection. |
|
Thesagro: |
Apomixia; Melhoramento Genético Vegetal; Pastagem; Seleção. |
|
Thesaurus Nal: |
apomixis; heritability; pastures; plant breeding. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02774naa a2200325 a 4500
001 1325554
005 2007-06-05
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 $aCNPGC.
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 $aheritability
650 $apastures
650 $aplant breeding
650 $aApomixia
650 $aMelhoramento Genético Vegetal
650 $aPastagem
650 $aSeleção
653 $aColonião
653 $aGuineagrass
653 $aHerdabilidade
653 $aPanicum maximun
653 $aSelection
700 1 $aJANK, L.
700 1 $aVALLE, C. B. do
700 1 $aBONATO, A. N. V.
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 39, n. 4, p. 335-341, abr. 2004.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Gado de Corte (CNPGC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 218 | |
| 22. |  | BRITO, J. R. F. PIFFER, I. A. SOBESTIANSKY, J. BRITO, M. A. V. P. e. Vacinacao com Bordetella bronchiseptica e Pasteurella multocida, associada a alteracoes do manejo, no controle da rinite atrofica dos suinos. Arquivo Brasileiro de Medicina Veterinaria e Zootecnia, v.45, n.2, p.183-191, 1993.| Biblioteca(s): Embrapa Suínos e Aves. |
|   |
| Registros recuperados : 218 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
