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Content archived on 2024-05-29

Characterization of a novel Ca2+ signalling system and functional identification of early-immediate genes in plant immunity

Objective

In the immune response, a resistance protein from the host (R) recognizes an avirulent protein from the pathogen (Avr) and elicits a defence response that abrogates the infection attempt. The immune response is generally accompanied by the hypersensitive response (HR), a form of programmed cell death (PCD) that manifests within hours after R/Avr recognition. In a random Virus-Induced-Gene-Silencing (VIGS) screening of a Nicotiana benthamiana cDNA library, I identified several genes that participate in the HR. Among those genes, I characterized in detail a MAPK kinase kinase kinase (MAPKKKa), a positive regulator of cell death in inmunity and susceptibility. I also identified a calcineurin B-like protein (NbCBL) and its target, a CBL-interacting protein kinase (NbCIPK).

These results implicate for the first time members of the CBL and CIPK families in biotic stress signalling. As a short-term goal, this project will focus on the characterization of NbCBL and NbCIPK in the immune and susceptible responses to pathogens in Solanaceae and Arabidopsis. For this purpose, I will use functional, biochemical, sub-cellular localization and genetic approaches. I will also investigate if there is a connection between the phosphorylation cascades elicited by CBL-CIPK and MA PKKKa. As a mid-long term goal, I plan to establish an optimised Forward Functional Genomics Screening strategy aimed to the targeted identification of genes that participate in early signalling events in the immune response (between R/Avr and MAPKKKa).

Keywords

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Topic(s)

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Call for proposal

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FP6-2004-MOBILITY-12
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Funding Scheme

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IRG - Marie Curie actions-International re-integration grants

Coordinator

UNIVERSIDAD DE SEVILLA
EU contribution
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Total cost

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