Recent Topics Posters
Sthultz, Christopher , Vincenot, lucie , Dubois, Marie-Pierre , Selosse, Marc-Andre .
Contrasted multi-scale genetic patterns in populations of the model ectomycorrhizal Basidiomycete Laccaria amethystina
Laccaria amethystina is an ectomycorrhizal Basidiomycete, associated with diverse host trees in European and Asiatic temperate forests. Population genetic structure has been investigated at local scales in Europe and Japan, revealing a high local genetic diversity (up to 13 000 genets/ha), but very little spatial structure (Fst < 0.03 over 500 km). The recent availability of the genome of the sister species L. bicolor offers new resources to further investigate population genetic structure across a geographic scales. We chose a multi-scale approach to investigate the population structure of this fungus and its mating system: a broad-scale European sampling, and local surveys of French populations.
Our analyses on 16 European populations of L. amethystina using new microsatellite markers revealed a broad panmictic population, and nearly no isolation by distance over 2000 km. A phylogeographic study based on five other coding and non-coding sequences confirms the low genetic variability over Europe. We got evidence that some L. amethystina Asiatic populations belong to a different species.
We found high microscale genetic diversity of L. amethystina populations, which may reflect environmental variations and local adaptation. Our surveys show that the microscale population dynamic varies with site ecology. We detected no structure correlating with the host species using neutral markers. We currently use newly available genomic resources to develop markers under selection (such as SNPs and gene sequences) to investigate functional polymorphism as a factor for microscale population structure.
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1 - Centre d'Ecologie Fonctionnelle et Evolutive CNRS, Umr 5175, 1919 Route de Mende, Montpellier, 34 293 , France
2 - Centre d\'Ecologie Fonctionnelle et Evolutive CNRS, 919 Route de Mende, Montpellier, Montpellier, 34293, France
3 - Centre d\\\'Ecologie Fonctionnelle et Evolutive CNRS,, 1919 Route de Mende, Montpellier, 34293, France
4 - Centre d'Ecologie Fonctionnelle et Evolutive, CNRS, UMR 5175, Equipe Interactions Biotiques , 1919 Route de Mende, Montpellier, 34000, France
Presentation Type: Recent Topics Poster
Location: Event Tent/Cliff Lodge
Date: Tuesday, July 28th, 2009
Time: 5:30 PM