期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 255, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2019.109848
关键词
Dimethachlon; Brevundimonas naejangsanensis J3; Immobilized cells; Immobilized enzymes; Elimination
资金
- Karst Science Research Center of Guizhou Province [U1812401]
- Key Technologies Research and Development Program of China [2016YFD0200200, 2016YFC0502602]
- National Natural Science Foundation of China [U1812401, 21267007, U1612441, 31301243]
- Science-Technology Support Program of Guizhou Province [(2012)3010, (2017)2568, [2019]2272, (2019)2403]
- Foundation of Excellent Youth Science-Technology Talent of Guizhou Province [(2017)5616]
Dimethachlon is a hazardous xenobiotic which poses a potential risk on the ecosystem and human health after foliar spray for mitigating fungal diseases of crops. A novel dimethachlon-degrading strain was isolated and identified as Brevundimonas naejangsanensis J3. Free cells and enzymes of this strain could rapidly eliminate 75 mg/L dimethachlon in liquid medium, especially the latter (>90% of degradation efficiency). Strain J3 completely metabolized dimethachlon by an ideally transformed pathway. Immobilization cells and enzymes exhibited better stability and adaptability for the repeated use, as compared with free cells and enzymes. In laboratory, 68.03 and 65.13%, or 82.67 and 95.41% of dimethachlon were eliminated from non-sterile soils by free or immobilized cells and enzymes within 7 d, respectively. Under the field condition, 95.78 and 98.01% of 20.250 kg a.i./ha dimethachlon wettable powder from soils were degraded by immobilized cells and enzymes in 9 d respectively, which were significant higher than the degradation efficiencies of free cells and enzymes (78.81 and 67.25%). This study highlights immobilized cells and enzymes from strain J3 can be applicable for bioremediating dimethachlon-contaminated soils.
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