BIOCHEMICAL EFFECTS OF VICTORIN ON OAT TISSUES AND MITOCHONDRIA

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Abstract
Victorin, the pathotoxin produced by the plant pathogenic fungus Helminthosporium victoriae, causes changes in respiration and permeability which are typical of diseased plant tissues. To provide information on the site and mode of action of this toxin, the effects of victorin on mitochondria were studied and the nature and quantities of materials released from victorin‐treated tissues were determined. Victorin added to isolated mitochondria had no effect on release of electrolytes or on oxidative‐phosphorylative capacity. Hence the high respiratory rate found in victorin‐treated tissues does not appear to be the result of a direct effect of the toxin on the respiratory centers. With mitochondria extracted from tissue pretreated with victorin, electrolyte release was unaffected but oxygen uptake was slightly higher and phosphate esterification considerably lower than controls. Thus the toxin produces indirect effects on mitochondrial activity, but the relation of these effects to tissue respiration remains undetermined. Victorin‐treated tissue lost much larger quantities of certain organic and inorganic materials than control tissue with the most striking difference in the amount of potassium released.
Funding Information
  • Public Health Service (A1-4033)

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