Abstract

A phytotoxic acidic glycoprotein from Rhynchosporium secalis filtrate contained mannose, rhamnose, glucosamine and galactose in the ratio of 1:1:1:2. Serine and threonine are involved in O-glycosidic linkages with the sugar moieties which account for 85% of the total weight. The toxin displays a great stability to heating and mild acid treatments. Mild alkali, protease or periodic acid treatments completely destroyed activity. Biological activity, chromatographic or electrophoretic data have shown the probable presence of the toxin in the infected barley leaves.

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