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 Z
₉
under the condition of using atrazine as sole carbon and nitrogen source. The configuration photos of Z
₉
were observed by using optic microscope and SEM. These photos showed the shape of Z
₉
was short bacilliform. By physiological and biochemical characteristics testing, the preliminary identifications indicated that Z
₉
belongs to Microbacterium sp. Through different experiments, we known that the suitable condition for atrazine degrading strain Z
₉
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%.