Victorin Production Stimulated by Oat Flakes

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Abstract
Fries'' solution, often supplemented with yeast extract, has served for many years as a standard medium for production of victorin by Helminthosporium victoriae and of selective pathotoxins by several other fungal pathogens. Adding oat flakes to Fries'' solution eliminated the need for yeast extract and greatly increased toxin titer. In media containing flakes, maximum toxin titers were achieved in 10-12 days instead of 3-4 wk, and residual dry weights of culture fluids were reduced by 30-50%.

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