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Emission d’auxine et de nitrates par les bactéries des turricules de vers de terre : effet sur la croissance et le développement des plantes

Abstract : Plants take up resources in their environment. They are also exposed to many signals, including molecules that profoundly alter their behavior or morphology. The prediction of the flow of nutrients from the soil to the plant requires an integration of flux regulation by signals which determine the kinetics of plant adaptations. During this thesis, different experimental and analytical approaches (split-root, isotopic labeling, root analysis) allowed us to study the coupling between signals and flows in the interactions between plants, microorganisms and earthworms. We first demonstrated that earthworms have a systemic effect on the growth and development of plants (Hordeum Vulgare L. and Oryza sativa L.) and that this effect is dependent on the abundance of earthworms. A methodological study aiming at optimizing the split-root device (the sharing of roots of a single plant into two compartments) helped us to improve plant (Brachypodium distachyon L.) survival and their emission of roots. This experimental set up was used to determine the importance of the presence of casts and their spatial localization on the N uptake by the plant. The lack of effect observed during this experiment lead us to address the mechanisms that may occur in the presence of worms according to their temporal dynamics. We then demonstrated that an important proportion of casts was responsible for root system adaptation only when the plant was exposed to casts for a sufficient period of time. These results are the first demonstration that the kinetics of the different mechanisms occurring in casts is crucial to explain the positive effect of casts on plants growth
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Corinne Agapit. Emission d’auxine et de nitrates par les bactéries des turricules de vers de terre : effet sur la croissance et le développement des plantes. Sciences agricoles. Université Paris-Est, 2018. Français. ⟨NNT : 2018PESC1001⟩. ⟨tel-01982100⟩

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