Action spectrum for fruiting in the basidiomycete Schizophyllum commune

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Abstract
An action spectrum for fruit body formation was determined in the range 280–723 nm for a dikaryon of Schizophyllum commune Fr. Action maxima occurred at 280 and 340–360 nm (main peak), and there were minor peaks at 437 and 467 nm. The quantum effectiveness at 360 nm was ca seven‐fold compared to that of 437 nm light. Wavelengths longer than 500 nm were ineffective. Light also induced formation of brown pigment in the area producing fruit bodies. Wavelengths ranging from 260 to 300 nm injured aerial hyphae at the border of the colony. The possibility that a flavin or a pteridine may be the photoreceptor is discussed.