Molecular markers to assess genetic diversity and population structure of an insular tree Santalum austrocaledonicum in New Caledonian archipelago

Bottin Lorraine, Verhaegen Daniel, Tassin Jacques, Olivieri Isabelle, Vaillant Alexandre, Bouvet Jean-Marc. 2005. Molecular markers to assess genetic diversity and population structure of an insular tree Santalum austrocaledonicum in New Caledonian archipelago. In : Abstracts of Plant and Animal Genomes XIIIth Conference, San Diego, CA (USA), January 15-19, 2005. s.l. : s.n., Résumé Plant and Animal Genomes Conference. 13, San Diego, États-Unis, 15 January 2005/19 January 2005.

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Abstract : We present the study of the genetic diversity and structure of a tropical tree in an insular system, using nuclear and chloroplastic microsatellites. Santalum austrocaledonicum is endemic to the archipelago of New Caledonia and is exploited for oil extraction from heartwood. 431 individuals were analysed for 8 nuclear microsatellite loci and 165 individuals for 3 chloroplast microsatellite loci. Both markers revealed that the genetic diversity was low in the most recent islands, the Loyautés, and high in the oldest island, Grande Terre, as well as the closeby small Ile des Pins. A strong genetic differentiation among all populations was observed, and the amount of differentiation increased with geographic distance in Iles Loyauté and in Grande Terre. At both population and island levels, island age and isolation seem to be the main factors influencing the amount of genetic diversity. In particular, populations from recent islands had large average Fis with nuclear microsatellites, that could not be entirely explained by null alleles or a Wahlund effect. This result suggests that, at least in some populations, selfing occured extensively. Conclusively, our results indicate a strong influence of insularity on the genetic diversity and structure of Santalum austrocaledonicum. (Texte intégral)

Mots-clés Agrovoc : Santalum, Marqueur génétique, Ressource génétique, Biogéographie, Variation génétique

Mots-clés géographiques Agrovoc : Nouvelle-Calédonie

Mots-clés complémentaires : Santalum austrocaledonicum

Classification Agris : F30 - Plant genetics and breeding

Auteurs et affiliations

  • Bottin Lorraine, CIRAD-FORET-UPR Génétique forestière (FRA)
  • Verhaegen Daniel, CIRAD-FORET-UPR Génétique forestière (FRA)
  • Tassin Jacques, CIRAD-FORET-UPR Génétique forestière (NCL)
  • Olivieri Isabelle, ISEM (FRA)
  • Vaillant Alexandre, CIRAD-FORET-UPR Génétique forestière (FRA) ORCID: 0000-0002-4785-1350
  • Bouvet Jean-Marc, CIRAD-FORET-UPR Génétique forestière (FRA)

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