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Please use this identifier to cite or link to this item : http://hdl.handle.net/2078.1/45860
Genetic diversity, population genetic structure and gene flow in Calluna vulgaris (L.) Hull were assessed by means of seven allozyme loci scored in 18 populations from the South-Western area of the species’ range. Genetic diversity was lower (H-T = 0.20) than reported for long-lived widespread species but was characterized by a high number of alleles per locus (5.60 at the species level) of which more than 70% were rare. More than 95% of genetic variation was found at the intrapopulation level (G(ST) = 0.047). High levels of past gene flow were inferred, based on the allozyme data (N-m = 5.2 from G(ST), N-m = 10.2 from the ‘private allele’ method). Calluna vulgaris exhibited several geographic patterns of genetic variation. Both cluster analysis, constructed with various genetic distances and principal components analysis showed that Spanish and Pyrenean populations were clearly different from those collected in the Massif Central and Belgium. Also, a trend for decreasing genetic diversity towards Northern populations was detected. These patterns might be related to the post-glacial history of Calluna. In addition, it is shown that isolation by distance has played a role in the geographic shaping of genetic variation in this species.
|Publication Date :||1997|
|Document type :||Article de périodique (Journal article) - (Article de recherche)|
|Source :||“New Phytologist” - Vol. 137, no. 2, p. 325-334 (1997)|
|Publisher :||Cambridge Univ Press (New York)|
|Publication status :||Publié|
|Subject :||Calluna vulgaris (heather) ; allozyme diversity ; population genetic structure ; gene flow ; isolation by distance|
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