The Nature of the Resistance of Oats to the Take-all Fungus

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Abstract
The distribution in oat seedlings of an inhibitor of fungal growth and respiration is described. The inhibitors from roots and leaves differ in that that from roots has a bright blue fluorescence under ultra-violet light, while in other respects they behave similarly; it is suggested that they differ in structure of a part of the molecule not concerned in the biological activity. The inhibitor is present in high concentration in the meristems of roots and leaves, one root tip extracted in 2 ml. water being sufficient to reduce growth of O. graminis to 50 per cent. of the control; yield from other parts of the seedling is much less. A quick assay technique based on growth-rate of mycelium is described, also a method for direct identification of inhibitory zones on chromatograms which avoids the necessity for elution.

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