3 Biotech

, 9:155 | Cite as

Biodegradation of polycyclic aromatic hydrocarbons (PAHs) in a diesel oil-contaminated mangrove by plant growth-promoting rhizobacteria

  • Carla J. S. Sampaio
  • José R. B. de Souza
  • Aldinéia O. Damião
  • Thiago C. Bahiense
  • Milton R. A. RoqueEmail author
Original Article


In this study, Rhizophora mangle L. mangrove plants and plant growth-promoting bacteria were evaluated for their ability to degrade polycyclic aromatic hydrocarbons in diesel oil-contaminated sediment. The diesel-contaminated soil was sown with plant growth-promoting bacteria in the R. mangle L. rhizosphere and monitored for 120 days in a greenhouse. The plant growth-promoting bacteria Pseudomonas aeruginosa and Bacillus sp. were analyzed for their ability to degrade eight priority polycyclic aromatic hydrocarbons, achieving a removal rate for naphthalene (80%), acenaphthene (> 60%), anthracene (> 50%), benzo(a)anthracene (> 60%), benzo(a)pyrene (> 50%) and dibenzo(a,h)anthracene (> 90%) in the treatments with and without plants. R. mangle L. demonstrated a removal rate above 50% for acenaphthene and fluoranthene. The bacterial strains promoted the development of the plant propagule in 55% of sediment contaminated with diesel. Scanning electron microscopy revealed the formation of biofilms by the strains in the roots of the plants in contact with the diesel. Thus, the interaction between Rhizophora mangle L. and the bacterial strains (Bacillus sp. and P. aeruginosa) demonstrated the potential of the strains to degrade diesel and bioremediate mangroves impacted by diesel oil.


Rhizophora mangle L. Bacillus sp. Pseudomonas aeruginosa Mangrove Diesel oil 



The authors would like to thank the Coordination for the Improvement of Higher Education Personnel-CAPES for the financial support in this study.

Compliance with ethical standards

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.


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Copyright information

© King Abdulaziz City for Science and Technology 2019

Authors and Affiliations

  • Carla J. S. Sampaio
    • 1
  • José R. B. de Souza
    • 2
  • Aldinéia O. Damião
    • 1
  • Thiago C. Bahiense
    • 1
  • Milton R. A. Roque
    • 1
    Email author
  1. 1.Laboratório de Microbiologia Aplicada e Bioprospecção, Departamento de Biointeração, Instituto de Ciências da SaúdeUniversidade Federal da Bahia (UFBA)SalvadorBrazil
  2. 2.Laboratório de Física Nuclear Aplicada, Departamento de Física da Terra e do Meio Ambiente, Instituto de FísicaUniversidade Federal da Bahia (UFBA)SalvadorBrazil

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