Distribution des régions génomiques différenciant deux espèces proches : le chêne sessile (Quercus petraea) et le chêne pédonculé (Q. robur)

Abstract : Sessile (Quercus petraea) and pedunculate (Q. robur) oak which are two inter-fertile species colonising the same space, display similar genomes, whereas maintain ecological and morphological specific differences. Two complementary approaches have been applied to study the molecular origin of phenotypic differences: (i) Location of QTL, controlling characters which differentiate the two species, in a genetic linkage map of pedunculate oak; (ii) estimation, in natural mixt stand, of the inter-specific differentiation coefficient (GST) for different types of molecular markers, already mapped in the same map. The both approaches suggests that genome regions involved in inter-specific differentiation are dispersed across the genome, although with a tendency to within-linkage group clustering in small distance. Our results suggest that species differentiation is mainly due multi-locus effects maintained by selective pressure strong enough to prevent gene flow from disrupting them.
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Caroline Saintagne. Distribution des régions génomiques différenciant deux espèces proches : le chêne sessile (Quercus petraea) et le chêne pédonculé (Q. robur). Sciences agricoles. Université Henri Poincaré - Nancy 1, 2003. Français. ⟨NNT : 2003NAN10059⟩. ⟨tel-01754427⟩

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