Compartment-specific antioxidative defense in Arabidopsis against virulent and avirulent Pseudomonas syringae.

Phytopathology
Dominik K GrosskinskyB Zechmann

Abstract

The accumulation of reactive oxygen species (ROS) during biotic stress is either part of a hypersensitive response of the plant or induced directly by the pathogen. Antioxidants such as ascorbate and glutathione counteract the accumulation of ROS and are part of the defense reaction. The aim of the present study was to investigate the compartment-specific importance of ascorbate and glutathione during a virulent and avirulent Pseudomonas syringae infection in Arabidopsis thaliana. Peroxisomes were found to be the hotspot for glutathione accumulation reaching 452% and 258% of control levels 24 h postinoculation during the virulent and avirulent infection, respectively. An accumulation of ascorbate could also be observed in vacuoles during Pseudomonas syringae infection, whereas glutathione remained absent in this cell compartment. Neither glutathione nor ascorbate accumulated in the apoplast during pathogen infection demonstrating an only negligible role of these antioxidants in the apoplast during pathogen infection. Compartment-specific changes followed a recently proposed stress model with an increase of ascorbate and glutathione in most cell compartments at the early stages of infection and a strong drop at the later stage o...Continue Reading

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Citations

Jan 25, 2013·Molecular Plant-microbe Interactions : MPMI·Hamed Soren SeifiMonica Höfte
Aug 28, 2012·Plant Science : an International Journal of Experimental Plant Biology·Dominik K GroßkinskyThomas Roitsch
Feb 8, 2014·Molecular Plant·Dominik K GroßkinskyThomas Roitsch
Sep 30, 2014·Phytochemistry·Silke LehmannJean-Pierre Metraux
Sep 16, 2014·Plant Science : an International Journal of Experimental Plant Biology·Barbara Eva KofflerBernd Zechmann
Nov 5, 2014·Frontiers in Plant Science·Bernd Zechmann
Jul 13, 2017·Antioxidants & Redox Signaling·Bernd Zechmann
Apr 2, 2020·Frontiers in Microbiology·Angela Marie C FerelliShirley A Micallef

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