Abstract:

Cypermethrin degrading strain Y-3 (Corynebacterium vitarumen) was used as the original strain, which was isolated from spinach leaves. The result indicated that its optimal condition induced by DES should be 2% 60min, 3% 40min and 4% 20min. The optimal condition of strain Y-3 induced by UV light was tested to be 5cm 8min, 10cm 20min and 15cm 30min. Thirteen mutants were obtained, among which seven mutants were proved to degrade cypermethrin on a higher level, compared with their original strain. Three of those mutants were tested to have hereditary stability to degrade cypermethrin.