World Journal of Microbiology and Biotechnology

, Volume 25, Issue 2, pp 259–268 | Cite as

Isolation and characterization of three Sphingobium sp. strains capable of degrading isoproturon and cloning of the catechol 1,2-dioxygenase gene from these strains

  • Ji-Quan Sun
  • Xing Huang
  • Qiao-Ling Chen
  • Bin Liang
  • Ji-Guo Qiu
  • Shinawar Waseem Ali
  • Shun-Peng Li
Original Paper


Three strains of bacteria (designated as YBL1, YBL2, YBL3 respectively) capable of degrading isoproturon, 3-(4-isopropylphenyl)-1, 1-dimethylurea, were isolated from the soils of two herbicide plants. Based on the comparative analysis of the 16S rRNA gene, and phenotypic and biochemical characterization, these strains were identified as Sphingobium sp. The optimum conditions for isoproturon degradation by these strains were pH 7.0, and temperature 30°C. Mg2+ (1 mM) enhanced the isoproturon degradation rate, while Ni2+ and Cu2+ (1 mmol l−1) inhibited isoproturon degradation significantly. These three strains also showed the ability to remove the residues of other phenylurea herbicides such as chlorotoluron, diuron and fluometuron in mineral salt culture medium. The N-demethylation was the first step of degradation of dimethylurea-substituted herbicides. Strain YBL1 was found capable of degrading both dimethylurea-substituted herbicides and methoxymethylphenyl-urea herbicides i.e. linuron (3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea). Using the PCR method, partial sequences of the catechol 1,2-dioxygenase gene were obtained from these strains.


Sphingobium Biodegradation Isoproturon Phenylurea herbicide Dioxygenase gene 


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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Ji-Quan Sun
    • 1
  • Xing Huang
    • 1
  • Qiao-Ling Chen
    • 1
  • Bin Liang
    • 1
  • Ji-Guo Qiu
    • 1
  • Shinawar Waseem Ali
    • 1
  • Shun-Peng Li
    • 1
    • 2
  1. 1.Key Lab of Microbiological Engineering of Agricultural Environment, Ministry of Agriculture, College of Life ScienceNanjing Agricultural UniversityNanjingPeople’s Republic of China
  2. 2.Department of Microbiology, College of Life ScienceNanjing Agricultural UniversityNanjingPeople’s Republic of China

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