Abstract
Two bacteria capable of efficiently degrading atrazine were isolated from soil, and named ATLJ-5 and ATLJ-11. ATLJ-5 and ATLJ-11 were identified as Bacillus licheniformis and Bacillus megaterium, respectively. The degradation efficiency of atrazine (50 mg/L) by strain ATLJ-5 can reach about 98.6% after 7 days, and strain ATLJ-11 can reach 99.6% under the same conditions. The degradation of atrazine is faster when two strains are used in combination. Adding the proper amount of fresh soil during the degradation of atrazine by these two strains can also increase the degradation efficiency. The strains ATLJ-5 and ATLJ-11 have high tolerance to atrazine, and can tolerate at least 1000 mg/L of atrazine. In addition, the strains ATLJ-5 and ATLJ-11 have been successfully made into a microbial agent that can be used to treat atrazine residues in soil. The degradation efficiency of atrazine (50 mg/kg) could reach 99.0% by this microbial agent after 7 days. These results suggest that the strains ATLJ-5 and ATLJ-11 can be used for the treatment of atrazine pollution.
Highlights
Atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) is used for weed control in crops such as maize, sugarcane, and citrus throughout the world [1]
The 5 mL culture solution with a 3-day degradation efficiency >60% was transferred to the enrichment medium containing 50 mg/L atrazine, and the culture was continuously passaged more than five times
The atrazine-degrading strains B. licheniformis ATLJ-5 and B. megaterium ATLJ-11 were isolated from soil
Summary
Atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) is used for weed control in crops such as maize, sugarcane, and citrus throughout the world [1]. Atrazine can inhibit the Hill reaction by binding to tyrosinase; for example, sublethal atrazine concentrations can induce a general inhibition on the growth and photosynthesis of Chlorella kessleri. It is considered a moderately persistent chemical in the environment as it has a long half-life, and greater mobility in soils than some other herbicides such as dipropetryne and simetryn [7]. The strains ATLJ-5 and ATLJ-11 have been successfully made into a microbial agent that is easy to commercialize and can be used to treat atrazine residues in soil. The microbial agent containing the strains ATLJ-5 and ATLJ-11 achieved good application results in this experiment
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