Abstract
1. The present paper deals with the results of the experiments on the effect of congored and chrysoidin upon the metabolism of Cochliobolus miyabeanus in culture.
2. In the nutrient solution containing a minute amount of azo-pigments, the mycelial growth of the fungus is accelerated more than in the control solution, increasing the consumption of glucose and nitrate in the solution. The retardation, however, took place, when a large amount of pigment was added, showing the decrease of the consumption in glucose and nitrate. The economic coefficient of glucose, in other words, the mycelium synthesized per one gram of glucose consumed, becomes high in the culture solution containing minute amount of pigment.
3. The pathogenicity (aggressive power) of the conidia of the fungus to rice plants decreased, when cultured on the media containing azopigments.
