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Research progress in microbial degradation of Chloroacetanilide herbicides*(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2019 05
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Research progress in microbial degradation of Chloroacetanilide herbicides*
CHEN Qing1 3 WANG Hongmei1** LI Xiaohong1 WEI Hongfei1 SU Peng1 HE Jian2** & JIANG Jiandong2
1 College of Life Science, Zaozhuang University , Zaozhuang 277100, China
2 Key Laboratory of Microbiological Engineering Agricultural Environment, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
3 College of Environmental and Resource Sciences, Nanjing Agricultural University, Nanjing 210095, China
Chloroacetanilide herbicides Biodegradation Bioremediation

Chloroacetanilide herbicides are a class of highly efficient preemergence herbicides that are widely used in the world. Presently, the production and use of the chloroacetanilide herbicides was less than glyphosate and sulfonylurea herbicides. Due to their widespread use, long persistence, and high-water solubility, some of these herbicides have frequently been detected in environment and show threat to human. Microbial metabolism is the most important factor in the degradation of chloroacetanilide herbicides in the environment. In the manuscript, we summarized the latest research progress on the strain’s isolation, identification, biodegradation pathway and molecular mechanisms (such as key genes and enzymes) of these herbicides . The anaerobic-bacteria degradation of the pathway is glutathione-acetanilide conjugates which can be further converted to sulfonated metabolites; The aerobic-bacteria degradation of the pathway is mainly initiated by N/C-dealkylation events, followed by aromatic ring hydroxylation and cleavage proceeds. The fungal degradation pathways of chloroacetanilide herbicides are more complex, therefore further studies are needed. Though, the genes of N-dealkylase, amidase and hydroxylase have been cloned, the characteristics of these enzymes have not been thoroughly studied. Currently, the research has only focused on biodegradation of alachlor, acetochlor and butachlor, but the metabolic pathways and molecular mechanisms for biodegradation of propisochlor and metolachlor have progressed slowly. So, in the future, we should strengthen the research on biodegradation of propisochlor and metolachlor. Especially, study on the chiral selectivity of the microorganisms and enzyme to the isomers of metolachlor. In addition, new genes for microbial degradation of this herbicide may provide gene resources for transgenic crop.




Last Update: 2019-03-15