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Étude des facteurs biotiques et abiotiques influant sur la structuration et la composition du microbiote racinaire du Peuplier

Abstract : Microorganisms play an essential role in the functioning of forest ecosystems. The pool of the root- associated microorganisms is called “root microbiome” and is known to promote tree growth, improve tree resistance to biotic and abiotic stresses and participate in nutrient cycling. Studying the factors that structure and regulate the root microbiome is essential to better understand the mechanisms involved in tree-microorganism interactions and the role of the tree root microbiome in response to current and future environmental constraints. During my thesis, I studied the colonization dynamic of grey poplar roots by bacterial and fungal communities in the soil by combining metagenomic and microscopic approaches. In parallel, a mesocosm study was carried out to determine the impact of the host genotype and environmental factors such as climate and soil type on the root microbiome of black poplar, a species that colonizes riparian ecosystems and is particularly affected by climate change. Finally, through metagenomic and metabolomic approaches, I studied, on the one hand, the impact of soil microbiome variations and, on the other hand, the signalling pathway of jasmonic acid, a phytohormone involved in defence, on the metabolome and communities of the root microbiome of grey poplar. The results of my thesis highlight the significant impact of the tree and environmental factors on the composition and taxonomic and functional structure of the root microbiome as well as the need to consider the tree and its microbiota as a "meta-organism" in its own right.
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https://hal.univ-lorraine.fr/tel-02877572
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Submitted on : Monday, June 22, 2020 - 3:18:38 PM
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Lauralie Mangeot-Peter. Étude des facteurs biotiques et abiotiques influant sur la structuration et la composition du microbiote racinaire du Peuplier. Sciences du Vivant [q-bio]. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0018⟩. ⟨tel-02877572⟩

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