COMPARATIVE STUDIES OF THE PHYSIOLOGY OF SAPROMYCES AND RELATED GENERA

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Abstract
Studies were made of the nutrition and carbon metabolism of Sapromyces elongatus, Rhipidium sp., and Apodachlya sp. Apodachlya sp. is autotrophic for all vitamins, whereas Sapromyces is heterotrophic for thiamine. Results with Rhipidium sp. were inconclusive. Of 14 sugars tested, the 3 organisms could utilize only glucose, fructose, and sucrose. S. elongatus grew on the Krebs cycle intermediates acetate, alpha-ketoglutarate, pyruvate, and succinate. Apodachlya sp. grew on acetate, pyruvate, fumarate, succinate, lactate, and malate. S. elongatus could use none of the fatty acids tested, while Apodachyla sp. grew on butyrate and valerate. The 3 organisms were incapable of using for growth ammonium and nitrate compounds. They could satisfy amino acid requirements provided at least 1 suitable amino acid was available. Their S requirements could be met with sulfates. Principal metabolic products were lactic acid and CO2. Carbon balances showed that under non-growing conditions, CO2 production increased with increase in aeration and lactic acid production decreased accordingly.

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