Data/hora: 30/05/2024 01:37:34

Biblioteca(s): | Embrapa Agricultura Digital.
Data corrente: | 02/06/2009
Data da última atualização: | 30/11/2010
Autoria: | ARNHOLD, E.; SILVA, D. J. H. da; MELLO FILHO, O. L. de; VIANA, J. M. S.
Afiliação: | EMMANUEL ARNHOLD, Universidade do Maranhão; DERLY JOSÉ HENRIQUES DA SILVA, UFV; ODILON LEMOS DE MELLO FILHO, CNPSo; JOSÉ MARCELO SORIANO VIANA, UFV.
Título: | Inbreeding depression simulation in popcorn cultivars to estimate the effective population size for germplasm conservation.
Ano de publicação: | 2007
Fonte/Imprenta: | Crop Breeding and Applied Biotechnology, Londrina, v. 7, n. 1, p. 87-93, Mar. 2007.
Idioma: | Inglês
Conteúdo: | Nowadays the corn variability is preserved mainly in germplasm banks. A population maintained in a germplasm bank can lose genetic variability when regenerations are performed with an inadequate effective population size. We therefore aimed at an estimation of the effective population size that minimizes alterations in the plant means of ear height, prolificity index, weight of 100 grains, grain yield and expansion capacity after ten regenerations in six popcorn populations. Six populations and their respective selfed generations were appraised in complete blocks with two replications. Yield was the trait with the most pronounced inbreeding depression. Population Rosa-Claro presented the strongest depression for yield (94.3%) and was used to simulate different effective sample sizes. It was concluded that an effective sample size of 200 unrelated non-inbred plants is enough to minimize inbreeding depression after ten regenerations, in all analyzed traits in the six populations.
Palavras-Chave: | Conservação de germoplasma; Depressão endogâmica; Tamanho efetivo.
Thesagro: | Agricultura; Biotecnologia; Genética; Milho Pipoca.
Categoria do assunto: | G Melhoramento Genético
Registro original: | Embrapa Agricultura Digital (CNPTIA)
Exemplares: | CNPTIA - (13076-1) - ADD - AP - PP -  -  -  - DIS