Study on Isolation and Identification of One Atrazine Degrading Strain and Its Degradation Characteristics

Under the outdoors temperature of -13degC, the corn soil (0-10 cm) of long-term applying atrazine was collected in Heilongjiang Province. From the collected soil, we isolated a strain which the ability of atrazine degrading was relatively high named Z₉ under the condition of using atrazine as sole carbon and nitrogen source. The configuration photos of Z₉ were observed by using optic microscope and SEM. These photos showed the shape of Z₉ was short bacilliform. By physiological and biochemical characteristics testing, the preliminary identifications indicated that Z₉ belongs to Microbacterium sp. Through different experiments, we known that the suitable condition for atrazine degrading strain Z₉ was: atrazine concentration was 100 mgldrl^-1, pH was 7, temperature at 30degC, Under these condition, after 12 days cultivation, the degradation rate of atrazine can reach 75.4%.