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Abstract

Recognition of Ralstonia solanacearum effectors in Nicotiana benthamiana.

Harnessing plant genetic resistance to disease contributes to sustainable improvement of crop production. Plant defense responses to pathogens are initiated by two large families of immune receptors that function in an integrated network. Immune receptors directly or indirectly monitor the presence of specific pathogen-derived molecules. Genomic approaches have revealed the extent of the nucleotide-binding leucine-rich repeat receptors (NLRs) repertoires in diverse plant species but the identification of receptor genes involved in recognition of the devastating bacterial wilt disease agent, Ralstonia pseudosolanacearum (Rps), remains a challenging task. Here, we have characterized several type III secreted effectors present in Korean Rps isolates that trigger robust defense responses in the model Solanaceae Nicotiana benthamiana. Using the combinatorial silencing of NLRs genes in N. benthamiana, we were able to rapidly identify and clone NLRs activating effector-triggered immunity. Further genetic and biochemical characterization of these receptors are ongoing. Altogether, our findings expand the pool of resource to improve bacterial wilt disease resistance in Solanaceae crops.

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Le Dr Segonzac est experte dans le domaine de la médiation de l'immunité. Professeure associée à l'université de Séoul, elle est actuellement en détachement au sein du laboratoire de Lionel Navarro (ENS, Paris).

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