Data/hora: 05/06/2024 14:02:08

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 19/07/2018
Data da última atualização: | 19/07/2018
Autoria: | VIANA, J. M. S.
Afiliação: | José Marcelo Soriano Viana, Universidade Federal de Viçosa - UFV/Departamento de Biologia Geral.
Título: | Breeding strategies for recurrent selection of maize.
Ano de publicação: | 2007
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 42, n. 10, p. 1383-1391, out. 2007
Idioma: | Inglês
Notas: | Título em português: Estratégias de melhoramento para seleção recorrente com milho.
Conteúdo: | The objectives of this work were to analyze theoretical genetic gains of maize due to recurrent selection among full-sib and half-sib families, obtained by Design I, Full-Sib Design and Half-Sib Design, and genotypic variability and gene loss with long term selection. The designs were evaluated by simulation, based on average estimated gains after ten selection cycles. The simulation process was based on seven gene systems with ten genes (with distinct degrees of dominance), three population classes (with different gene frequencies), under three environmental conditions (heritability values), and four selection strategies. Each combination was repeated ten times, amounting to 25, 200 simulations. Full-sib selection is generally more efficient than half-sib selection, mainly with favorable dominant genes. The use of full-sib families derived by Design I is generally more efficient than using progenies obtained by Full-Sib Design. Using Design I with 50 males and 200 females (effective size of 160) did not result in improved populations with minimum genotypic variability. In the populations with lower effective size (160 and 400) the loss of favorable genes was restricted to recessive genes with reduced frequencies.
Palavras-Chave: | Delineamento I; Design I; Família de irmão completo; Família de meio-irmão; Full-sib families; Ganho genético; Half-sib families; Seleção em tandem.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/180006/1/Breeding-strategies-for-recurrent-selection.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (62810-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS