Abstract
The effects of victorin, the toxin produced by Helminthosporium victoriae, on membrane potentials of susceptible and resistant oat roots were investigated. Treatment of susceptible roots with 50 units victorin/ml caused a measurable depolarization within 2 to 5 min and averaged approximately 30% depolarization within 10 min. No changes were detected when susceptible roots were treated with deactivated victorin or when resistant roots were treated with victorin. Although heterogeneity in the cell population was indicated by differences in both the normal and depolarized potentials, the results indicate a similar response to the toxin, namely depolarization.
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