Medium MMC     Czapeck Total
Chlorate % 1.5 3 5 3  
nit1 0 83 30 188 301
nit3 0 67 19 85 171
NitM 0 23 5 47 75
Total 0 173 54 320 547
Table 1: The numbers of nit mutants of F. oxysporum.