1988 Volume 54 Issue 4 Pages 503-509
Lethal and mutagenic effects of four kinds of mutagens [N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), ethyl methanesulfonate (EMS), UV light (UV) and γ-ray] on Cochliobolus heterostrophus were studied. In MNNG and UV mutageneses, the number of surviving conidia decreased linearly as the dosage increased, but in EMS and γ-ray mutageneses, the number of survivors decreased non linearly. In γ-ray mutagenesis, survival of the conidia did not depend on the total dose but on the dose rate. Four different color mutants (white, salmon, brown and pale green) were obtained. The maximum frequency of color mutants among the survivors was 0.51% at 5.5% survival in MNNG treatment, 0.43% at 1.4% survival in EMS treatment, 0.05% at 13.2% survival in UV treatment and 0.07% at 2.6% survival in γ-ray treatment.
