Table 2.
Frequency of mutations arising in different fungal strains. Five independent cultures of each strain were grown for 7 days on potato dextrose agar (PDA), and 2.5 × 106 spores collected from each culture were spread onto PDA plates containing 0.15 m chlorate. Chlorate‐resistant colonies were counted after 3 days of incubation at 28 °C. Wild‐type (wt) ultraviolet (UV)‐treated colonies were irradiated with 600 J/m2 after 4 days of growth. Mean values and standard deviations were calculated from two replicate plates.
| Culture | Strain | ||||
|---|---|---|---|---|---|
| wt | wt UV‐treated | 7A1 | 21D7 | 23F7 | |
| 1 | 0 ± 0 | 39.5 ± 3.5 | 3.5 ± 0.7 | 4.5 ± 2.1 | 4 ± 1.1 |
| 2 | 0 ± 0 | 38.5 ± 2.1 | 4.5 ± 0.7 | 9.5 ± 2.1 | 3 ± 1.4 |
| 3 | 35.5 ± 0.71 | 72 ± 5.6 | 349 ± 29.7 | 1.5 ± 2.1 | 1 ± 1.4 |
| 4 | 0 ± 0 | 75.5 ± 4.9 | 5.5 ± 0.7 | 2.5 ± 2.1 | 11 ± 0 |
| 5 | 0 ± 0 | 50 ± 14.1 | 4.5 ± 2.1 | 1 ± 0 | 3 ± 2.8 |