Action Spectrum for Photosporogenesis in Botrytis cinerea Pers. ex Fr

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Abstract
An action spectrum for photoinduced conidium formation in the fungus B. cinerea Pers. ex Fr. was determined by exposing colonies to monochromatic radiation obtained from a diffraction grating monochromator. Wavelengths longer than 355 nm were ineffective even after exposures of 8 h at intensities of 4068-8276 erg/cm2 per s. Colonies were exposed at 22.5.degree. C for 226-355 nm at about 5 nm intervals. Three prominent peaks of effectiveness occurred at about 231, 268 and 283 nm, and there was also a minor peak at about 303 nm. The most effective wavelength for inducing sporulation was 231 nm; it was 25% more effective than the second most effective wavelength (283 nm).