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Acclimatation de l’espèce aquatique invasive, Ludwigia grandiflora, au milieu terrestre : Approches physiologique et épigénétique

Abstract : Abstract: In the context of the expansion of invasive species, their survival is conditioned by their ability to adapt. In France, Ludwigia grandiflora has invaded aquatic biotopes and its recent deployment in wet meadows has led to the emergence of two morphotypes, one aquatic and the other called “terrestrial”. The aim of this thesis was to get a better understanding of water primrose acclimation capacities to terrestrial environment through exploring genetic and epigenetic sources of flexibility. The responses of two morphotypes to different water stresses were evaluated by observing physiological traits. The epigenetic pathway was addressed by the use of a hypomethylant drug. This work showed that L. grandiflora adapts its development and metabolism according to environmental conditions.The terrestrial morphotype shows higher trait values than those of the aquatic morphotype, regardless of the condition. However, phenotypic plasticity is higher in the aquatic morphotype. Finally, our results suggest the involvement of DNA methylation and phenotypic plasticity in the response of water primrose to environmental change. Since the terrestrial morphotype has higher capacities than the aquatic morphotype, its management must become a priority. The acquisition of genomic resources in L. grandiflora will make it possible to search for genetic and epigenetic markers of acclimation to the terrestrial environment.
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Julien Genitoni. Acclimatation de l’espèce aquatique invasive, Ludwigia grandiflora, au milieu terrestre : Approches physiologique et épigénétique. Ecologie, Environnement. Agrocampus Ouest, 2019. Français. ⟨NNT : 2019NSARA085⟩. ⟨tel-02886498v2⟩

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