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Degradation of chlorpyrifos by an endophytic bacterium of the Sphingomonas genus (strain HJY) isolated from Chinese chives (Allium tuberosum)

文献类型: 外文期刊

作者: Feng, Fayun 1 ; Li, Yisong 3 ; Ge, Jing 1 ; Chen, Jinjin 1 ; Jiang, Wayne; He, Shuang 2 ; Liu, Xianjing 2 ; Yu, Xiangy 1 ;

作者机构: 1.State Key Lab Breeding Base, Key Lab Food Qual & Safety Jiangsu Prov, 50 Zhongling St, Nanjing 210014, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Food Qual & Safety, Nanjing, Jiangsu, Peoples R China

3.Shihezi Univ, Dept Plant Protect, Coll Agr, Xinjiang, Peoples R China

4.Shihezi Univ, Dept Plant Pr

关键词: Endophytic bacterium;chlorpyrifos;degradation;Sphingomonas sp

期刊名称:JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES ( 影响因子:1.99; 五年影响因子:2.116 )

ISSN: 0360-1234

年卷期: 2017 年 52 卷 10 期

页码:

收录情况: SCI

摘要: The degradation of chlorpyrifos (CP) by an endophytic bacterial strain (HJY) isolated from Chinese chives (Allium tuberosum Rottl. ex Spreng) was investigated. Strain HJY was identified as Sphingomonas sp. based on morphological, physiological, and biochemical tests and a 16S rDNA sequence analysis. Approximately 96% of 20mg L-1 CP was degraded by strain HJY over 15days in liquid minimal salts medium (MSM). The CP degradation rate could also be increased by glucose supplementation. The optimal conditions for the removal of 20mg L-1 CP by strain HJY in MSM were 2% inoculum density, pH 6.0, and 30-35 degrees C. The CP degradation rate constant and half-life were 0.2136 +/- 0.0063 d(-1) and 3.2451 +/- 0.0975 d, respectively, under these conditions, but were raised to 0.7961 +/- 0.1925 d(-1) and 0.8707 +/- 0.3079 d with 1% glucose supplementation. The detection of metabolic products and screening for degrading genes indicated that O,O-diethyl O-3,5,6-trichloropyridinol was the major degradation product from CP, while it was likely that some functional genes were undetected and the mechanism responsible for CP degradation by strain HJY remained unknown. Strain HJY is potentially useful for the reduction of CP residues in Chinese chives and may be used for the in situ phytoremediation of CP.

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