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Deciphering the interactions between plants and bacteria in the context of isoprenoid biosynthesis in Arabidopsis thaliana

Abstract : Isoprenoids are a large class of molecules found in all living organisms that are implicated in diverse biological processes. The aim of my thesis was to decipher if they could be involved in the interactions between plants and bacteria. Therefore, I worked on Arabidopsis thaliana wild-type and mutants, altered in the two isoprenoid biosynthesis pathways occurring in higher plants. An inventory of the communities interacting with wild-type and mutants highlighted some differentially abundant bacteria, despite the existence of a core microbiota. In addition, plants affected in the plastidial biosynthesis pathway, referred as the methylerythritol phosphate (MEP) pathway, have been shown to be more affected than wild-type by Pseudomonas syringae, a well-known phytopathogen. Together, these results suggest that isoprenoids may play a role in the interactions between plants and bacteria. In addition, 230 strains were isolated from A. thaliana in the laboratory, among which some of them were tested for their impact on the plant fitness and resistance to P. syringae, and for the impact on isoprenoids on these strains.
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Chloé Groh. Deciphering the interactions between plants and bacteria in the context of isoprenoid biosynthesis in Arabidopsis thaliana. Vegetal Biology. Université de Strasbourg, 2019. English. ⟨NNT : 2019STRAJ079⟩. ⟨tel-02968590⟩

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