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Méthylation de l’ADN et plasticité phénotypique en réponse à des variations de disponibilité en eau chez le peuplier

Abstract : Due to rapid climate changes, trees must exhibit phenotypic plasticity. Epigenetic mechanisms are part of current research to explain phenotypic plasticity. This thesis aimed to evaluate the role of DNA methylation in phenotypic plasticity of a perennial sequenced organism, poplar, in response to variations in soil water availability. The work, combining ecophysiology and epigenomics, focused on the shoot apical meristem, the center of morphogenesis of the leafy stem. Three major results emerge from this thesis: (i) Each hydric state is associated with a specific methylome and transcriptome, (ii) Some differentially methylated regions are conserved in time and between environmental contexts, (iii) Hypomethylated RNAi lines subjected to different contexts show a modified response. The results obtained during this thesis support a contribution of DNA methylation to phenotypic plasticity and suggest a role of epigenetic mechanisms in stress memory in trees.
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https://tel.archives-ouvertes.fr/tel-01713124
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Submitted on : Tuesday, February 20, 2018 - 11:12:07 AM
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Anne-Laure Le Gac. Méthylation de l’ADN et plasticité phénotypique en réponse à des variations de disponibilité en eau chez le peuplier. Sciences agricoles. Université d'Orléans, 2017. Français. ⟨NNT : 2017ORLE2014⟩. ⟨tel-01713124⟩

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