Histochemical Changes in Oat Cell Walls After Victorin Treatment

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Abstract
Oat roots treated with victorin [from Helminthosporium victoriae] showed greater affinity for staining with Schiff''s reagent, silaver methenamine and an alkaline bismuth reagent than did comparable nontreated roots, but no differences were found by using Thiery''s technique. Staining of cell walls, the outer surface of the plasmalemma, starch grains and Golgi vesicles was reduced by aldehyde-blocking reagents in victorin-treated roots, suggesting that changes in carbohydrates were responsible for the differences observed. Cell wall lesions contained amorphous materials similar in density to the cell wall with all stains used. Wall lesions may result from activation of host cell wall enzymes.