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Titolo:
GENETIC DIVERSITY AND SPATIAL STRUCTURE WITHIN A NATURAL STAND OF A TROPICAL FOREST TREE SPECIES, CARAPA-PROCERA (MELIACEAE), IN FRENCH-GUIANA
Autore:
DOLIGEZ A; JOLY HI;
Indirizzi:
CIRAD FORET,UR DIVERSITE & AMELIORAT GENET,BP 5035 F-34032 MONTPELLIER FRANCE CIRAD FORET,UR DIVERSITE & AMELIORAT GENET F-34032 MONTPELLIER FRANCE SILVOLAB KOUROU 97379 FRENCH GUIANA
Titolo Testata:
Heredity
, volume: 79, anno: 1997,
parte:, 1
pagine: 72 - 82
SICI:
0018-067X(1997)79:<72:GDASSW>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
GLEDITSIA-TRIACANTHOS LEGUMINOSAE; CORDIA-ALLIODORA BORAGINACEAE; AUTO-CORRELATION ANALYSIS; ACER-SACCHARUM MARSH; POPULATION-GENETICS; NEOTROPICAL TREE; MATING SYSTEM; BLACK SPRUCE; AUTOCORRELATION; SELECTION;
Keywords:
EXCESS HETEROZYGOSITY; GENE FLOW; GENETIC STRUCTURE; ISOZYMES; SPATIAL AUTOCORRELATION; TROPICAL TREE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
A. Doligez e H.I. Joly, "GENETIC DIVERSITY AND SPATIAL STRUCTURE WITHIN A NATURAL STAND OF A TROPICAL FOREST TREE SPECIES, CARAPA-PROCERA (MELIACEAE), IN FRENCH-GUIANA", Heredity, 79, 1997, pp. 72-82

Abstract

Isozyme markers were used to characterize levels of diversity, genotypic structure and spatial genetic structure for the low-density tree species, Carapa procera (five adults per ha), within 300 ha of a continuous tropical 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 heterozygotes. 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 50 m). No clear-cut spatial pattern was observed in pollen allele frequencies, which supports the hypothesis of extensive pollen flow. This overall lack of structure is consistent with the data already available on the mating system of this predominantly outcrossing species.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 14:14:41