Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Registro completo
Provedor de dados:  Repositório Alice
País:  Brazil
Título:  Mating system in a natural population of Theobroma grandiflorum (Willd. ex Spreng.) Schum., by microsatellite markers.
Autores:  ALVES, R. M.
ARTERO, A. S.
SEBBENN, A. M.
FIGUEIRA, A.
Data:  2005-06-24
Ano:  2003
Palavras-chave:  Cupuaçu
População natural
Conservação de germoplasma
Genética
Nova Ipixuna
Pará
Amazônia
Brasil
Resumo:  The aim of this research was to study the mating system of a natural population of Theobroma grandiflorum (cupuassu) from Nova Ipixuna, Pará state, using microsatellite markers. Eight polymorphic microsatellite loci were analyzed in eight families, each represented by 10 six-month old seedlings derived from open-pollinated pods. The estimation for the multilocus outcrossing rate ($tm= 1.0) and individual outcrossing rate ($t= 1.0) for this population suggests that T. grandiflorum may be a perfect outbreeding (allogamous) species. Likewise, for the studied population the estimate for single locus outcrossing rate ($ts) was elevated (0.946), but lower than $tm, confirming the likely outcrossing character of the species and suggesting the occurrence of 5.4% biparental inbreeding rate ($tm-$ts). The estimation of genetic divergence ($FST) between allelic frequencies in ovules and pollen revealed a deviation from random mating in 75% of the evaluated loci. Likewise, the estimate of correlation of paternity ($rp= 0.930) and the mean coefficient of co-ancestrality within families ($?xy= 0.501) indicated that the outcrossings were predominantly correlated, and the offspring were full-sibs. These results suggested that for this particular population of T. grandiflorum, the sampling strategy for genetic conservation and breeding should adopt specific models for families derived from correlated outcrossing (full-sibs) and not the ones usually adopted in classic outcrossing species breeding programs (half-sibs).

2003
Tipo:  Artigo em periódico indexado (ALICE)
Idioma:  Inglês
Identificador:  36455

http://www.alice.cnptia.embrapa.br/handle/doc/406930

http://ainfo.cnptia.embrapa.br/digital/bitstream/item/18122/1/a25v26n3.pdf
Editor:  Genetics and Molecular Biology, v. 26, n. 3, p. 373-379, 2003.
Relação:  Embrapa Amazônia Oriental - Artigo em periódico indexado (ALICE)
Fechar
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional