Data/hora: 15/06/2024 00:45:57

Biblioteca(s): | Embrapa Amazônia Oriental.
Data corrente: | 24/06/2005
Data da última atualização: | 29/11/2016
Autoria: | ALVES, R. M.; ARTERO, A. S.; SEBBENN, A. M.; FIGUEIRA, A.
Afiliação: | RAFAEL MOYSES ALVES, CPATU; ANGELA S. ARTERO, USP/CENA; ALEXANDRE M. SEBBENN, INSTITUTO FLORESTAL DE SÃO PAULO; ANTONIO FIGUEIRA, USP/CENA.
Título: | Mating system in a natural population of Theobroma grandiflorum (Willd. ex Spreng.) Schum., by microsatellite markers.
Ano de publicação: | 2003
Fonte/Imprenta: | Genetics and Molecular Biology, v. 26, n. 3, p. 373-379, 2003.
Idioma: | Inglês
Conteúdo: | 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).
Palavras-Chave: | Brasil; Conservação de germoplasma; Nova Ipixuna; Pará; População natural.
Thesagro: | Cupuaçu; Genética.
Thesaurus Nal: | Amazonia.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/18122/1/a25v26n3.pdf
Registro original: | Embrapa Amazônia Oriental (CPATU)
Exemplares: | CPATU - (36455-1) - UPC - AP - PP - 575.105 - G1 -  - DIS