Abstract
Cochliobolus miyabeanus secretes pectic enzyme, xylanase and cellulase in the cultute filtrate. The optimum conditions of their activities are as follows: Pectic enzyme is in pH 7 and at 30°C., xylanase in pH 6-7 and at 30°C. and cellulase in pH 5 and at 35°C. In these enzymes, the exoenzyme is more active than the endoenzyme. In the culture, at flrst cellulase and xylanase are secreted but pectic enzyme is not, and later pectic enzyme becomes more active than the others.
The toxicity of culture filtrates to rice leaves are not observed. From these results, the writer assumes that the perthophytic action of this fungus to rice plant is not due to the metabolic products like toxin, but to the action of the enzymes.
