Abstract
Inoculation of the first true leaf of cucumber with Colletotrichum lagenarium enhanced peroxidase activity in leaf 2. The increased activity was associated, at least in part, with the fastest moving anodic isozymes during polyacrylamide gel electrophoresis. All plant parts and cellular fractions exhibited enhanced peroxidase activity in protected as compared to control plants. Injury of leaf 1 with dry ice neither induced systemic resistance to C. lagenarium nor enhanced peroxidase activity of leaf 2. Inoculation of leaf 1 with C. lagenarium followed by inoculation of leaf 2, 1 week later, elicited a higher degree of protection and higher peroxidase activity in leaf 3 than did single inoculations. Increasing numbers of C. lagenarium lesions on leaf 1 progressively increased peroxidase activity and resistance in leaf 2. Induced resistance was detected 3 to 4 days after inoculation of leaf 1, whereas peroxidase activity increased after the 4th day.
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