Abstract

The results reported have a bearing on the necessity of sodium as a complementary ion for better growth ofCunninghamella. This element effected moderate sucrose absorption, polysaccharide accumulation and gain in dry weight accompanied by least galactosan building, maximum respiration rate and carbohydrate accumulation. Potassium gave the maximum gain in dry weight and least sugar absorption and polysaccharide accumulation. Although lithium exhibited a slightly higher rate of sugar absorption than potassium and showed the maximum polysaccharide formation, it about equalled potassium in having similar effects on carbon dioxide output and total carbohydrate content. Thallous ions were toxic as the fungus lost weight and showed the least carbohydrate content accompanied by very low respiration rate. Colchicine, under the above mentioned conditions, did not affect the dry weight of the fungus but increased or decreased the rate of absorption of sucrose, respiration and carbohydrate metabolism, depending on the concentration of the chemical and the type of prevalent univalent cation.

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