PURPOSE: To accomplish degradative cleanup of pollptants by obtaining pollutant-degradative microbes from the environment polluted with organochlorine compounds followed by changing the microbes into oxygenase- manifestative microbes through mutation which are, in turn made to act on the original environment.

CONSTITUTION: Corynebacterium sp. J1 strain (FERM P-14332), a kind of microbes capable of degrading organochlorine compounds, is obtained from the environment polluted with such organochlorine compounds, and then changed into an oxygenase-manifestative microbial strain through mutation, which is, in turn, made to act on the original environment. For the mutation, any means such as ultraviolet-light irradiation or nitrosoguanidine can be applied.