SUMMARY: The effect of 5-fluoro-2-deoxyuridine (FdUrd), 6-azauridine, miracil D, 5-fluorouracil, cycloheximide, actinomycin D and puromycin on light-induced synchronous conidiation in Pers. ex Fr. is described. FdUrd, 6-azauridine, miracil D, 5-fluorouracil, and cycloheximide inhibited photoinduced conidiation at the appropriate concentrations. Suppression of conidiation was greater when these inhibitors were added just before, rather than after, the photoinduction period. Actinomycin D and puromycin, both at 10 to 10 M, were ineffective. Incorporation of labelled precursors into nucleic acids and protein in the presence of FdUrd, miracil D, 5-fluorouracil and cycloheximide was greatly suppressed. The results suggest the involvement of nucleic acids and proteins in light-induced conidiation in


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