Title:	Mating system in a natural population of Theobroma grandiflorum (Willd. ex Spreng.) Schum., by microsatellite markers.
Authors:	ALVES, R. M. ARTERO, A. S. SEBBENN, A. M. FIGUEIRA, A.
Affiliation:	RAFAEL MOYSES ALVES, CPATU; ANGELA S. ARTERO, USP/CENA; ALEXANDRE M. SEBBENN, INSTITUTO FLORESTAL DE SÃO PAULO; ANTONIO FIGUEIRA, USP/CENA.
Date Issued:	2003
Citation:	Genetics and Molecular Biology, v. 26, n. 3, p. 373-379, 2003.
Description:	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).
Thesagro:	Cupuaçu Genética
NAL Thesaurus:	Amazonia
Keywords:	População natural Conservação de germoplasma Nova Ipixuna Pará Brasil
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPATU)