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The production of reactive oxygen species on the plant-cell surface is considered. Along with the plasmalemmal redox systems, cell-wall peroxidase is involved in the production of superoxide and hydrogen peroxide. Under stress conditions, some soluble peroxidase isoforms are easily secreted into the apoplast. Various membranotropic compounds, salicylic acid in particular, can also induce this process. Mobile peroxidase forms are supposed to induce the plant defense response.