Bioelectric Potentials of Tumor-Infected Plants

Abstract
The potentials of tomato plants inoculated with Phytomonas tumefaciens begin to be significantly lower than those of controls a few days before the tumor becomes visible. The potentials at the point of inoculation were negative with respect to a neutral point. The potentials along the stem upwards show consistent decrease and are not affected by the presence of the tumor, while the presence of a node causes a sharp rise. No regular diurnal periodicity of variation of potential was observed for either healthy or infected plants.

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