Comparative molecular and phytochemical study of the tree species Santalum austrocaledonicum (Santalaceae) distributed in the New-Caledonian archipelago

Bottin Lorraine, Isnard Camille, Lagrange Alexandre, Bouvet Jean-Marc. 2007. Comparative molecular and phytochemical study of the tree species Santalum austrocaledonicum (Santalaceae) distributed in the New-Caledonian archipelago. Chemistry and Biodiversity, 4 (7) : 1541-1556.

Résumé : We have tried to elucidate the origin of phytochemical variation in trees by studying concomitantly the chemical and microsatellite variations in Santalum austrocaledonicum. Eight natural populations were sampled in the New-Caledonian archipelago, a total of 157 individuals being analyzed. The main components, as revealed by gas chromatography (GC), were alpha- and beta-santalol (as in other sandalwood species), although the level of (Z)-lanceol was particularly high. Most of the chemical variation was observed within populations (83.7%). With microsatellites, the variation between populations was more pronounced (32% of the total variation). Although the chemical variation between populations was small, we investigated the effects of genetic drift and migration by comparing the chemical- and molecular-differentiation patterns. The poor congruence between neighbor-joining trees, confirmed by the non-significant Mantel test between the molecular and chemical distance matrices (R=0.26, P=0.12), showed that genetic drift and migration are not the main evolutionary forces acting on chemical differentiation between populations. We could not find any effect of soil and rainfall conditions neither. Although the impact of drift and migration cannot be discounted in rationalizing between-population differentiation, the low variation among populations could result from a stabilizing selection caused by the same phytopathogen charge across the natural range.

Mots-clés Agrovoc : Santalum

Mots-clés géographiques Agrovoc : Nouvelle-Calédonie, France

Mots-clés complémentaires : Santalum austrocaledonicum

Classification Agris : F70 - Taxonomie végétale et phytogéographie
F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Bottin Lorraine, MNHN (FRA)
• Isnard Camille, Laboratoire Cosmecal (NCL)
• Lagrange Alexandre, IRD (NCL)
• Bouvet Jean-Marc, CIRAD-BIOS-UPR Génétique forestière (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/540583/)

Métriques

[ Page générée et mise en cache le 2024-12-18 ]