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Victorin-Induced Changes of Peroxidase Isoenzymes in Oats. Anton Novacky, Research Associate, Department of Plant Pathology, University of Kentucky, Lexington 40506; Harry Wheeler, Professor, Department of Plant Pathology, University of Kentucky, Lexington 40506. Phytopathology 60:467-471. Accepted for publication 10 October 1969. DOI: 10.1094/Phyto-60-467.

Treatment of susceptible oat leaves with 0.2-20 units/ml of victorin, the pathotoxic product of Helminthosporium victoriae, induced quantitative changes in peroxidase isoenzymes. No changes were found in resistant tissue treated with the same concentrations of victorin. However, with increases in the victorin concentration to 200 units/ml, similar alterations were produced in resistant leaves. These results provide further evidence of the ability of resistant tissue to respond to victorin, and of the quantitative character of resistance to this toxin. Victorin-induced changes were compared with those in naturally senescent, detached senescent, and mechanically injured leaves. Effects of victorin are not duplicated by senescence, but are similar to those caused by wounds. This suggests that victorin-induced changes in isoperoxidases may primarily result from a nonspecific response to injury.