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| Titre : |
Genetic diversity and spatial structure within a natural stand of a tropical forest tree species, carapa procera (meliaceae), in french Guiana
|
| Auteur(s) : |
A. Doligez
H. Joly |
| Type de document : | Tiré à part |
| Sujets : | EXCESS HETEROZYGOSITY ; GENE FLOW ; GENTIC STRUTURE ; ISOZYMES ; SPATIAL AUTOCORRELATION ; TROPICAL TREE ; CARAPA PROCERA Amérique du Sud ; Guyane française ; Meliaceae AMERIQUE DU SUD |
| Résumé : |
Isozyme markers were used to characterizelevels of diversity genotypic structure and spatial genetic structure for the low_density tree species,carapa procera (five adults per ha), within300ha of a continuous rain forest stand. Both seed and adult stages were investigated, a high level of genetic diversity being found in both. Fixation indices showed excess homozygosity in seeds, and excess heterozygosity in adults, which might be caused by selection in favour of hetetozygotes. Autocorrelation analysis of the spatial distribution of genotypes revealed no significant pattern in adults or in seeds before dispersal, and there was a high variability in correlogram shapes among alleles. This suggests that gene flow is extensive in C.procera, probably mainly through long-distance pollen dis[...]
Isozyme markers were used to characterizelevels of diversity genotypic structure and spatial genetic structure for the low_density tree species,carapa procera (five adults per ha), within300ha of a continuous rain forest stand. Both seed and adult stages were investigated, a high level of genetic diversity being found in both. Fixation indices showed excess homozygosity in seeds, and excess heterozygosity in adults, which might be caused by selection in favour of hetetozygotes. Autocorrelation analysis of the spatial distribution of genotypes revealed no significant pattern in adults or in seeds before dispersal, and there was a high variability in correlogram shapes among alleles. This suggests that gene flow is extensive in C.procera, probably mainly through long-distance pollen dispersal as seed dispersal is expected to be rather limited in this species (maximum distances of about 50m). No clear-cut spatial pattern was observed on pollen allele |
| Editeur(s) : | The Genetical Society of Great Britain |
| Date de publication : | 1997 |
| Format : | pp. 72-82., graph., tabl., 44 réf.-p. 72-82 |
| Langue(s) : | Anglais |
| Lien vers la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=149418 |
Exemplaires (1)
| Localisation | Emplacement | Pôle | Section | Cote | Support | Disponibilité |
|---|---|---|---|---|---|---|
| Kourou | AgroParisTech-Kourou | SI TP16078 | Papier | Empruntable Disponible |