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Chloroplast DNA variation of Tilia cordata (Tiliaceae)

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Abstract:

The distribution of haplotypic diversity of 17 Tilia cordata Mill. populations was investigated by PCR–RFLP markers of the chloroplast genomes. A high number of haplotypes (14) and high total genetic diversity (hT = 0.881) were detected. The distribution of the chloroplast DNA haplotypes revealed low geographic structure of the genetic diversity; the coefficient of differentiation between populations, Gst = 0.552, was lower than the mean value reported for maternally inherited markers in Angiosperm tree species. The value of population subdivision for ordered alleles, as measured by Nst, was significantly higher than the value of population subdivision for unordered alleles (Nst = 0.662, Gst = 0.552), thus indicating the presence of a phylogeographic structure. The relatively low genetic differentiation among T. cordata populations may be explained mainly as a consequence of human impact on this species.

Les auteurs ont étudié la répartition de la diversité des haplotypes de 17 populations de Tilia cordata Mill. à l'aide de marqueurs PCR–RFLP du génome chloroplastique. Un nombre élevé d'haplotypes (14) a été observé et la diversité génétique totale était également élevée (hT = 0,881). La répartition des haplotypes d'ADN chloroplastique correspondait à une structuration géographique faible de la diversité génétique; le coefficient de différenciation inter population, Gst = 0,552, était plus faible que la valeur moyenne rapportée pour les marqueurs transmis maternellement chez les espèces angiospermes arborescentes. La valeur de différenciation de populations pour les allèles ordonnés, telle que mesurée par Nst, était significativement plus élevée que la valeur de différenciation de populations pour les allèles non ordonnés (Nst = 0,662, Gst = 0,552). Cet écart indique la présence d'une structure phylogéographique. La différenciation génétique relativement faible parmi les populations de T. cordata pourrait être due principalement à des effets de l'activité humaine sur l'espèce.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2003

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