Abstract
One of the important initial events upon recognition of a plant pathogen is the changes in the redox status of the infected cells due to the accumulation of Reactive Oxygen Species (ROS). Though plants have evolved an array of defensive strategies to resist stresses, including those from attack by pathogens, but the changed redox cue of the infected cells are often exploited by the plant for specific purpose as well. It is becoming evident gradually that ROS or the redox cue, which are generated during pathogen attack are recognized by plant as a signaling agent for triggering responses. The necrosis of infected tissue caused by ROS during pathogen infection increases host susceptibility to necrotrophic pathogen, but exhibit resistance to biotrophic pathogen.
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