title: Regulation of periodicity and intensity of photo-induced conidiation of Trichoderma viride.
abstract: After a short irradiation at 366 nm with 200 lx, the intensity of conidiation of Trichoderma viride colonies grown in the dark increased for the first 10 s proportionally with time. The increase slowed down after 10 s-5 min of exposure and after 10-60 min of irradiation the conidiation intensity began to decrease. When photo-induced by daylight, the conidiation started at a high rate after 25 h and persisted even after 48 h. The conidiation had no circadian character and its periodicity depended on the periodicity of photo-induction. Its intensity was also influenced by the carbon sources used, a maximum being reached with glucose (1-2%). Higher glucose concentrations inhibited conidiation but had no influence on growth of colonies.
mesh_terms: D003470:Culture Media; D008027:Light; D003904:Mitosporic Fungi / Q000502:physiology*; D013172:Spores, Fungal; D013997:Time Factors; D014242:Trichoderma / Q000254:growth & development / Q000502:physiology* / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D003470:Culture Media