The effects of the ring rot causal agent Clavibacter michiganensis subsp. sepedonicus (a virulent strain 5369) on the peroxidase activity of various tissues of potato plants grown under axenic conditions were studied. Root infection enhanced peroxidase activity in all plant tissues (roots, leaves, and stems). In the resistant cv. Lugovskoi, peroxidase activity was much higher than in the susceptible cv. Luk'yanovskii. Co-culturing of the suspension cells of these potato cultivars with the bacterial pathogen also activated peroxidase in the cells of the resistant cultivar; in the cells of the susceptible cultivar, peroxidase activation was less pronounced. Treating suspension cell with exopolysaccharides secreted by the pathogen enhanced the activity of extra- and intracellular peroxidases, and the degree of this enhancement differed in the two potato cultivars.
Russian Journal of Plant Physiology – Springer Journals
Published: Sep 26, 2004
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