Abstract
Fruiting-inducing substance (FIS), which is effective to induce fruiting bodies in monokaryotic mycelia of a strain of the Basidiomycete, Coprinus macrorhizus, has been detected in cell-free extracts of fruiting bodies and dikaryotic mycelia of C. macrorhizus itself and fruiting bodies of several other Basidiomycete species. Inducibility by FIS was controlled by genetic and environmental factors. Constitutive mutants which form monokaryotic fruiting bodies without addition of FIS were isolated. Fruiting bodies and monokaryotic mycelia of these mutants also contained FIS. FIS was stable to heat, acid and alkaline hydrolysis, and several enzymes degradating proteins and nucleic acids. Two fractions of FIS were obtained after Sephadex G-25 chromatography. One of them contained protein and the other appears to have similar chemical nature as adenosine-3′, 5′-monophosphate or adenosine-3′-monophosphate which were active to induce monokaryotic fruiting.
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