EFFECTS OF VISIBLE LIGHT UPON UV-TREATED CONIDIA OF ASPERGILLUS SOJAE

Abstract

By using mutants of Aspergillus sojae, it was demonstrated again that the heterocaryons and the heterozygous diploids irradiated by ultraviolet light gave rise to diploids and somatic segregants in higher frequencies. These two effects of ultraviolet light were compared with the so-called inactivation (killing) effect of UV. The haploid conidia inactivated by ultraviolet light were reactivated by visible light, while visible light gave no significant effect on diploidization and segregation. It was concluded, therefore, that the mechanism of UV function on inactivation is different from that on diploidization and segregation. Differences between two functions of UV, on diploidization and on segregation, are not known.