Back to Search Start Over

Chloroplast DNA variation in a rainforest tree (Aucoumea klaineana, burseraceae) in Gabon.

Authors :
Muloko-Ntoutoume N
Petit RJ
White L
Abernethy K
Source :
Molecular ecology [Mol Ecol] 2000 Mar; Vol. 9 (3), pp. 359-63.
Publication Year :
2000

Abstract

One of the dominant savannah colonists in Gabon is Aucoumea klaineana or Okoumé (Burseraceae), an endemic species which belongs to a monotypic genus. Chloroplast DNA (cpDNA) variation was studied in this species by means of PCR amplification of 40 kb of cpDNA sequences, followed by restriction analysis of the resulting fragments. No insertion/deletion events were noted, and a single point mutation was found. The level of differentiation among the 19 populations studied was relatively low (GST = 0.54) compared to other plant species (mean of 0.76), in agreement with the pioneer status of the species. However, cpDNA diversity was geographically structured, with the less frequent haplotype occurring only in populations from southern Gabon. This distribution might suggest either that there were two ancient source populations of Okoumé, one in the north and the other in the south, from which the colonizing process of the savannah began after the last ice age, or alternatively that there was one polymorphic source in the south. The low level of cpDNA diversity could indicate that Okoumé populations in these refugia were quite small.

Details

Language :
English
ISSN :
0962-1083
Volume :
9
Issue :
3
Database :
MEDLINE
Journal :
Molecular ecology
Publication Type :
Academic Journal
Accession number :
10736033
Full Text :
https://doi.org/10.1046/j.1365-294x.2000.00859.x