The content of RNA in mycelium and isolated nuclei of Aspergillus oryzae 3-9-15 was studied after its growth during two days on the modified Capek medium containing 0.01 and 10 mg% of IAA. A direct correlation has been established between the extracellular concentration of IAA and its content in the mycelium and isolated nuclei of the fungus. The stimulating effect of the extracellular IAA on the content of RNA in the isolated nuclei was optimal after one hour of incubation in the Capek medium containing 0.01 or 10 mg% of IAA.
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