Arabidopsis Natural Variation in Response to an Oomycetal Necrotic Elicitor
Conference Recording Mar 18, 2013
About the Speaker
Bernard's PhD was performed at the Institute for Plant Molecular Biology (IBMP, CNRS, Strasbourg) on the regulation of the plant secondary metabolism during the immune response. He is Research Director at the CNRS at Toulouse (France), working on plant immunity and microbial effectors.
The first layer of the plant immune system relies on the recognition of conserved pathogen-associated molecular patterns (PAMPs) and is called PTI for PAMP-triggered Immunity. PTI is generally described as an ancestral mechanism of immunity largely conserved among lines of a given plant species. We are studying the activity of non-enzymatic proteins produced by oomycetes, a group of fungal-like pathogens. These proteins are named CBEL (Cellulose-Binding Elicitor Lectin) and induce PTI on several plant families including the model plant Arabidopsis thaliana where it causes a hypersensitive-like cell death associated to the induction of defense genes. To identify plant genes involved in CBEL perception, a core collection of 48 lines representing the genetic variability of Arabidopsis thaliana was screened for CBEL responses. Surprisingly, this screening assay pointed out strong variations in CBEL perception among Arabidopsis accessions. Further analyses of lines responding differentially to CBEL revealed a particular role of a signaling pathway involving the production of active oxygen species in the response to CBEL. Genetic analyses aiming at indentifying loci involved in CBEL responses will be presented.
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