The uptake and incorporation of l-phenylalanine and l-leucine into various cell fractions of Rhizoctonia solani and Sclerotium bataticola decreased with cell age. As would be expected, most of the radioactivity from the amino acids was distributed in the soluble and protein fractions. Ratios of the radioactivity in the soluble fraction to that in the protein fraction indicated that in R. solani the mechanism for protein synthesis decreased with age. However, in S. bataticola, the decrease in protein synthesis with age may be due to a decrease in permeability to the amino acids.
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