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The plant immune system : induction, memory and de-priming of defense responses by endogenous, exogenous and synthetic elicitors

Abstract : As sessile organism, plants have to react quickly and strongly with defense responses to repel any invading pathogen. The plant immune system can be triggered by exogenous or endogenous elicitor molecules. Another class of elicitors are defense promoting compounds which are also known as synthetic elicitors. Here I describe the discovery and characterization of a novel family of potentially secreted small endogenous peptides (PROSCOOP) which members harbor small peptides (SCOOPs). I show that the SCOOP family is involved in plant defense and root development. Various SCOOP peptides induce short- and long-term defense responses. Moreover, treatments with the SCOOP12 peptide induce the resistance against Pseudomonas syringae in Arabidopsis. In the second part of this thesis, I show that treatments with a synthetic elicitor can lead to long-term transcriptional memory and that subsequent challenging of such plants with an exogenous elicitor reverted this transcriptional memory. In conclusion, my thesis shows (1) how diverse the function of these elicitors can be and (2) the impact the plant defense system and its triggers have on plant development and memory.
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Submitted on : Thursday, December 19, 2019 - 4:35:15 PM
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  • HAL Id : tel-02419987, version 1

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Kay Gully. The plant immune system : induction, memory and de-priming of defense responses by endogenous, exogenous and synthetic elicitors. Agricultural sciences. Université d'Angers, 2019. English. ⟨NNT : 2019ANGE0001⟩. ⟨tel-02419987⟩

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