Data/hora: 18/06/2024 05:27:17

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