Search results for "Plant immunity"
showing 9 items of 39 documents
Study of the chaperone protein CDC48 and its involvement in plant immunity
2018
CDC48 is a conserved chaperone protein belonging to the AAA+ ATPase family (ATPase associated with various activities). This protein uses binding and hydrolysis of ATP to generate forces to affect the transformation of polypeptide substrate in numerous cellular processes. Studies on mammalian CDC48 orthologue revealed that it recognizes ubiquitylated polypeptides, directly or via partners, leading to substrate degradation or recycling. In plants, functions of CDC48 is less understood. The aim of my thesis, is to decipher the role of CDC48 in plant defense response context. First, I have to characterize NtCDC48 in tobacco (Nicotiana tabacum) suspension cells elicited by cryptogein, an elicit…
Récepteurs de l'immunité chez les plantes
2013
New insights about the role of the chaperon-like protein Cdc48, a target for nitric oxide in plant immunity
2015
Analysis of the cross‐regulation between immunity, growth and iron homeostasis in plants
2019
The existence of a tightly regulated balance between growth and immunity in plants has recently emerged. In this study, we challenged this concept thanks to the biological model pyoverdine-Arabidopsis thaliana. Pyoverdine is a siderophore produced by the plant growth promoting rhizobacteria Pseudomonas fluorescens C7R12. Under iron deficiency, P. fluorescens excretes the iron free form of pyoverdine (apo‐pyo) in the soil. Once chelated with iron (ferri‐pyo), the complex is internalized by the bacteria. We demonstrated that Arabidopsis thaliana plants treated by apo‐pyo in a medium containing or not iron internalize pyoverdine. Interestingly, apo‐pyo-treated plants did not show a typical gro…
Analysis of the role of nitric oxide (NO) in the cross‐regulation between immunity, growth and iron homeostasis in plants
2019
Studies performed in our Agroecology Department show that the immune response of plants is linked to their iron nutrition and is modulated by pyoverdine, a siderophore produced by the plant beneficial rhizobacteria Pseudomonas fluorescens C7R12. Accordingly, Arabidopsis thaliana plantlets exposed to iron deficiency and treated with pyoverdine in its iron non‐chelated structure (apo‐pyo) show an enhanced growth but a decreased immune response capacity. We hypothesize that nitric oxide (NO), a universal signaling molecule, is a key component of the regulation of the immune response in plants exposed to apo‐pyo and to the C7R12 strain. We checked by fluorescence microscopy that NO is actually …
The role of NtRBOHD in regulation of response to cryptogein in tobacco cells
2014
International audience
Habilitation à Diriger des Recherches
2020
Carbohydrates in plant immunity and plant protection: roles and potential application as foliar sprays.
2014
International audience; Increasing interest is devoted to carbohydrates for their roles in plant immunity. Some of them are elicitors of plant defenses whereas other ones act as signaling molecules in a manner similar to phytohormones. This review first describes the main classes of carbohydrates associated to plant immunity, their role and mode of action. More precisely, the state of the art about perception of "PAMP, MAMP, and DAMP (Pathogen-, Microbe-, Damage-Associated Molecular Patterns) type" oligosaccharides is presented and examples of induced defense events are provided. A particular attention is paid to the structure/activity relationships of these compounds. The role of sugars as…
Cryptogein signaling in tobacco: in search for nitric oxide targets
2013
Nitric oxide (NO) triggers various physiological responses in plants. Notably, NO is recognized to account for the response to biotic stresses. We previously reported that NO is produced in tobacco cells exposed to cryptogein, a 10 kDa elicitor secreted by the oomycete Phytophthora cryptogea. To decipher the role of NO, we identified and characterized S-nitrosylated proteins in tobacco cell suspensions elicited by cryptogein. Several candidates were identified including the chaperone-like AAA+ATPase CDC48 and a calmodulin isoform (CaM). Interestingly, the Cys residue undergoing S-nitrosylation in CaM is located in the first Ca2+ binding EF hand and is not or poorly conserved in other organi…