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Diversité et structure génétique de semis de Populus nigra L. suite à des événements de régénération entre 2008 et 2017 sur les îles de Mareau-aux-Prés

Abstract : Mareau-aux-Prés islands (Loiret, France) were modify in 2012, in order to limit floods of the Loire River. The vegetation of one island was removed and the floor levelled. To observe the dynamics of black poplar (Populus nigra) genetic diversity and structure during its recolonization process, we studied regeneration events using 12 SSR markers. In 2013, 2015 and 2017, three regenerations of black poplar occurred and 72 populations and 2232 seedlings from the island were sampled. 362 adult trees genotyped in 2008, from the island surroundings, were used to study parental links between the seedlings and those hypothetical parents. No genetic structure was observed between the populations sampled and no effect of their geographical localization on their genetic diversity was found. On another hand, a difference in the number of different alleles was observed, when comparing our results with those obtained in 2008 and 2013. Finally, parental links between seedlings and adult trees were observed, but about two-thirds of seedlings from 2015 do not have any parents identified, meaning that those individuals come from more distant sites. This study demonstrates that a strong gene flow occurs for P. nigra along the Loire River and that the stochasticity of regeneration event has an important impact on its genetic diversity.
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  • PRODINRA : 479562

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Auriane Roger, Sara Marin, Anthony Dubois, Vanina Guérin, Véronique Jorge, et al.. Diversité et structure génétique de semis de Populus nigra L. suite à des événements de régénération entre 2008 et 2017 sur les îles de Mareau-aux-Prés. 3. conférence internationale I.S Rivers. Recherches et actions au service des fleuves et grandes rivières. Integrative sciences and sustainable development of rivers, Zône Atelier Bassin du Rhône (ZABR). FRA. Groupe de Recherche Rhône Alpes sur les Infrastructures et l'Eau (GRAIE), FRA., Jun 2018, Lyon, France. ⟨hal-02734547⟩

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