一株蒽降解菌的分离筛选及降解特性初析
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(1.中国农业科学院农业资源与农业区划研究所,北京100081;2.农业农村部微生物产品质量安全风险评估实验室,北京100081)

作者简介:

朱倬漪(1998-),硕士研究生,主要研究农业微生物资源与应用。E-mail:zzy98@hnu.edu.cn。

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基金项目:云南省重大科技专项计划(202202AE090025);国家重点研发计划(2021YFD1700200)。


Isolation and screening of an anthracene-degrading strain and preliminary analysis of its degradation characteristics
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(1.Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081;2.Laboratory of Quality & Safety Risk Assessment for Microbial Products(Beijing),Ministry of Agriculture,Beijing 100081)

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    摘要:

    多环芳烃(PAHs)是土壤中最常见的典型持久性有机污染物,蒽作为其典型代表,常被用作降解PAHs的模型化合物和检测PAHs污染的指示物。采集北京郊区受污染土样,通过驯化和富集,分离出185株具有蒽降解潜力的菌株,采用高效液相色谱法定量测定菌株的蒽降解效率,筛选获得一株可高效降解蒽的菌株R4004-2。经菌落形态观察、16SrRNA和gyrB基因系统发育分析、基因组框架图ANI、DDH和dDDH值分析,确定R4004-2为施氏假单胞菌(Pseudomonas stutzeri)。菌株R4004-2以蒽为唯一碳源,对蒽的降解率可达82.3%,在肉汤培养基中的生长速度最快。在蒽含量为0.25mg/kg的污染土壤中,施氏假单胞菌R4004-2可以有效定殖,具有修复污染土壤的潜力。基于转录组以及代谢组结果,施氏假单胞菌R4004-2通过双加氧酶进行对蒽的第一步氧化,后续分别通过蒽醌的氧化以及1-羟基-2-萘甲酸酯的分解两个途径完成对蒽的降解,初步解析了其降解机制。

    Abstract:

    Polycyclic aromatic hydrocarbons(PAHs)are the most common typical persistent organic pollutants in soil.Anthracene,considered as the typical representative,is often used as a model compound for degrading PAHs and an indicator for detecting PAHs contamination.The contaminated soil samples were collected from the suburbs of Beijing,and 185 strains with anthracene degradation potential were isolated after domestication and enrichment.Moreover,the anthracene degradation efficiency was quantified by high performance liquid chromatography(HPLC),and a strain R4004-2 with high anthracene degradation efficiency was obtained.According to colonial morphology,phylogenetic analysis of 16S rDNA and gyrB,as well as ANI,DDH,dDDH of genomics,the strain R4004-2 was identified as Pseudomonas stutzeri.Pseudomonas stutzeri R4004-2 grew well when anthracene was used as the sole carbon source.It could degrade up to 82.3% of anthracene and grew fastest in broth medium.In contaminated soil with anthracene content of 0.25 mg/kg,Pseudomonas stutzeri R4004-2 could effectively colonize,indicating the potential to remediate contaminated soil.Based on the transcriptomic and metabolomic results,Pseudomonas stutzeri R4004-2 was able to oxidize anthracene in the first step through dioxygenase,and then complete the degradation of anthracene through the oxidation of anthraquinone and the decomposition of 1-hydroxy-2-naphthoate,respectively,and initially resolved its degradation mechanism.

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朱倬漪,姜昕,马鸣超,曹凤明,王佳馨.一株蒽降解菌的分离筛选及降解特性初析[J].中国土壤与肥料,2024,(3):198-208.

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  • 收稿日期:2023-03-10
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  • 录用日期:2023-06-22
  • 在线发布日期: 2024-06-06
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