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Plant and Cell Physiology, 1969, Vol. 10, No. 2 387-392
© 1969

Article

An action spectrum for photoinduced sporulation in the fungus Trichoderma viride

TADASHI KUMAGAI and YOSHIHARU ODA

Institute for Agricultural Research, Tohoku University Sendai, Japan

When a dark grown colony of Trichoderma viride is exposed to white light for a short time, sporulation occurs only in the narrow region of mycelia produced just prior to illumination. The action spectrum of this light effect was obtained for wavelengths below 520 mµ using monochromatic irradiation of known intensity having a band width of 10 mµ. The action spectrum shows 4 distinct peaks at 320, 380, 430 and 480 mµ. The wavelengths at 320 and 380 mµ are most effective in photoinduced sporulation. The longer wavelengths, 430 and 480 mµ, are considerably less effective.

The possibility that a carotenoid or a flavin compound may be a photoreceptor in this photoinduced sporulation is discussed.

(Received January 4, 1969; )
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