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Isolation, Identification and Characteristics of an Endophytic Quinclorac Degrading Bacterium Bacillus megaterium Q3

文献类型： 外文期刊

作者： Liu, Min 2 ; Luo, Kun 1 ; Wang, Yunsheng 2 ; Zeng, Aiping 1 ; Zhou, Xiaomao 1 ; Luo, Feng 2 ; Bai, Lianyang 4 ;

作者机构： 1.Hunan Agr Univ, Inst Pesticide Sci, Changsha, Hunan, Peoples R China

2.Hunan Agr Univ, Coll Plant Protect, Changsha, Hunan, Peoples R China

3.Clemson Univ, Sch Comp, Clemson, SC USA

4.Hunan Acad Agr Sci, Changsha, Hunan, Peoples R China

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2014 年 9 卷 9 期

页码：

收录情况： SCI

摘要： In this study, we isolated an endophytic quinclorac-degrading bacterium strain Q3 from the root of tobacco grown in quinclorac contaminated soil. Based on morphological characteristics, Biolog identification, and 16S rDNA sequence analysis, we identified strain Q3 as Bacillus megaterium. We investigated the effects of temperature, pH, inoculation size, and initial quinclorac concentration on growth and degrading efficiency of Q3. Under the optimal degrading condition, Q3 could degrade 93% of quinclorac from the initial concentration of 20 mg/L in seven days. We analyzed the degradation products of quinclorac using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The major degradation products by Q3 were different from those of previously identified quinclorac degrading strains, which suggests that Q3 may employ new pathways for quinclorac degradation. Our indoor pot experiments demonstrated that Q3 can effectively alleviate the quinclorac phytotoxicity in tobacco. As the first endophytic microbial that is capable of degrading quinclorac, Q3 can be a good bioremediation bacterium for quinclorac phytotoxicity.

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