VERON, V.; CARON, H.; DEGEN, B.

doi:10.1515/sg-2005-0040

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

VERON, V.
Ecologie des forêts de Guyane [UMR ECOFOG]

CARON, H.
Biodiversité, Gènes et Ecosystèmes [BioGeCo]

DEGEN, B.

Langue

Article de revue

Ce document a été publié dans

Silvae Genetica. 2005-05-01

Résumé en anglais

In this paper we report a study of the mating system and gene flow of Sextonia rubra, a hermaphroditic, insect pollinated tropical tree species with a geographic distribution in the Guyana Plateau and the Amazon. Using five microsatellites we analysed 428 seeds of 27 open pollinated families at the experimental site "Paracou" in French Guiana. We observed, compared to other tropical tree species, a high level of genetic diversity. We estimated parameters of the mating system and gene flow by using the mixed mating model and the TwoGener approach. The estimated multilocus outcrossing rate, t m , was 0.992 indicating nearly complete outcrossing. A significant level of biparental inbreeding and a small proportion of full-sibs were estimated for the 27 seed arrays. The differentiation of allelic frequencies among the pollen pools was Φ FT = 0.061. We estimated mean pollen dispersal distances between 65 m and 89 m according to the dispersal models used. The joint estimation of pollen dispersal and density of reproductive trees gave an effective density estimate of 2.1-2.2 trees/ha.< Réduire

Mots clés en anglais

Genetic diversity

gene flow

heterozygosity

microsatellites

mixed mating

tropical tree

twogener

Métadonnées

Licence d’utilisation du document

Gene flow and mating system of the tropical tree Sextonia rubra

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

DOI

Origine

Unités de recherche