期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 68, 期 26, 页码 6967-6976出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.0c01066
关键词
bioremediation; degradation pathway; enantiomer-specific dioxygenase; mineralization; phenoxyalkanoic acid herbicide; Sphingopyxis sp
资金
- National Natural Science Foundation of China [31670111, 31900077]
- Key Program of Natural Science Research in Colleges and Universities in Anhui Province [KJ2020A0038]
- China Postdoctoral Science Foundation [2018M630566]
Dichlorprop [(RS)-2-(2,4-dichlorophenoxy)propanoic acid; DCPP], an important phenoxyalkanoic acid herbicide (PAAH), is extensively used in the form of racemic mixtures (Rac-DCPP), and the environmental fates of both DCPP enantiomers [(R)-DCPP and (S)-DCPP] mediated by microorganisms are of great concern. In this study, a bacterial strain Sphingopyxis sp. DBS4 was isolated from contaminated soil and was capable of utilizing both (R)-DCPP and (S)-DCPP as the sole carbon source for growth. Strain DBS4 preferentially catabolized (S)-DCPP as compared to (R)-DCPP. The optimal conditions for Rac-DCPP degradation by strain DBS4 were 30 degrees C and pH 7.0. In addition to Rac-DCPP, other PAAHs such as (RS)-2-(4-chloro-2-methylphenoxy)propanoic acid, 2,4-dichlorophenoxyacetic acid, 4-chloro-2-methylphenoxyacetic acid, and 2,4-dichlorophenoxyacetic acid butyl ester could also be catabolized by strain DBS4. Bioremediation of Rac-DCPP-contaminated soil by inoculation of strain DBS4 exhibited an effective removal of both (R)-DCPP and (S)-DCPP from the soil. Due to its broad substrate spectrum, strain DBS4 showed great potential in the bioremediation of PAAH-contaminated sites.
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