STIMULATION BY LIGHT OF SPORULATION IN TRICHODERMA LIGNORUM (TODE) HARZ

Abstract

Exposure of growing cultures to white light caused subsequent formation of a ring of conidia-bearing mycelium at the location occupied by their advancing margins at the time of irradiation. Violet and blue light were very effective in stimulating sporulation, green was less so, and yellow and red were ineffective. An exposure to white light of the order of 1 foot-candle for 1 minute sufficed to initiate the sporulation response.