%0 Journal Article %A Carlile, M. J. %T A Study of the Factors Influencing Non-genetic Variation in a Strain of Fusarium oxysporum %D 1956 %J Microbiology, %V 14 %N 3 %P 643-654 %@ 1465-2080 %R https://doi.org/10.1099/00221287-14-3-643 %I Microbiology Society, %X SUMMARY: The colour variation of a strain of Fusarium oxysporum Schlecht ex Fr. was found to depend on the production of carotenoids and naphthoquinones. The carotenoids were only produced as a result of exposure to light, whereas the production of naphthoquinones, which were pH indicators, was mainly regulated by the carbon/nitrogen ratio of the medium. The morphogenetic effects of radiation and of carbon/nitrogen ratio were also considered. A low carbon/nitrogen ratio favoured chlamydospore formation and aerial mycelium, whereas ultraviolet radiation, and to a lesser extent light, promoted macrospore and sclerotium production. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-14-3-643