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Pregled bibliografske jedinice broj: 497866

Insight in the PCB-degrading functional community in long-term contaminated soil under bioremediation


Petrić, Ines; Hršak, Dubravka; Fingler, Sanja; Udiković-Kolić, Nikolina; Bru, David; Martin-Laurent, Fabrice
Insight in the PCB-degrading functional community in long-term contaminated soil under bioremediation // Journal of soils and sediments, 11 (2011), 2; 290-300 doi:10.1007/s11368-010-0299-y (međunarodna recenzija, članak, znanstveni)


Naslov
Insight in the PCB-degrading functional community in long-term contaminated soil under bioremediation

Autori
Petrić, Ines ; Hršak, Dubravka ; Fingler, Sanja ; Udiković-Kolić, Nikolina ; Bru, David ; Martin-Laurent, Fabrice

Izvornik
Journal of soils and sediments (1439-0108) 11 (2011), 2; 290-300

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Bioremediation; bph gene; PCB-degrading community; polychlorinated biphenyls; rhodococcus

Sažetak
A small-scale bioremediation assay was developed in order to get insight into the functioning of a polychlorinated biphenyl (PCB) degrading community during the time course of bioremediation treatment of a contaminated soil. The study was conducted with the aim to better understand the key mechanisms involved in PCBremoval from soils. Two bioremediation strategies were applied in the assay: (a) biostimulation (addition of carvone as inducer of biphenyl pathway, soya lecithin for improving PCB bioavailability, and xylose as supplemental carbon source) and (b) bioaugmentation with selected seed cultures TSZ7 or Rhodococcus sp. Z6 originating from the transformer station soil and showing substantial PCBdegrading activity. Functional PCB-degrading community was investigated by using molecular-based approaches (sequencing, qPCR) targeting bphA and bphC genes, coding key enzymes of the upper biphenyl pathway, in soil DNA extracts. In addition, kinetics of PCBs removal during the bioremediation treatment was determined using gas chromatography mass spectrometry analyses. bphA-based phylogeny revealed that bioremediation affected the structure of the PCBdegrading community in soils, with Rhodococcus-like bacterial populations developing as dominant members. Tracking of this population further indicated that applied bioremediation treatments led to its enrichment within the PCB-degrading community. The abundance of the PCBdegrading community, estimated by quantifying the copy number of bphA and bphC genes, revealed that it represented up to 0.3% of the total bacterial community. All bioremediation treatments were shown to enhance PCB reduction in soils, with approximately 40% of total PCBs being removed during a 1-year period. The faster PCB reduction achieved in bioaugmented soils suggested an important role of the seed cultures in bioremediation processes. PCBs degrading community was modified in response to bioremediation treatments, leading to partial removal of PCBs from contaminated soil. The abundance of the PCB-degrading community was increased, and Rhodococcus-like bacterial population was identified as its key player. Combination of molecular approaches with chemical analyses is of prime interest to monitor microbial processes involved in the bioremediation treatment. They offer new insight in the managing of PCBs contaminated sites providing the opportunity to design the bioremediation strategy based on on-site evaluation of PCBs degrading ability of the soil microbial community.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Biologija, Biotehnologija



POVEZANOST RADA


Projekt / tema
022-0222882-2896 - Organska onečišćenja u okolišu - raspodjela, interakcije, izloženost ljudi (Vlasta Drevenkar, )
098-0982934-2712 - Organski spojevi kao molekulski obilježivači antropogenog utjecaja na okoliš (Marijan Ahel, )

Ustanove
Institut za medicinska istraživanja i medicinu rada, Zagreb,
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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