scholarly journals Polycyclic aromatic hydrocarbon sorption and bacterial community composition of biodegradable and conventional plastics incubated in coastal sediments

2021 ◽  
Vol 755 ◽  
pp. 143088
Author(s):  
Pinja Näkki ◽  
Eeva Eronen-Rasimus ◽  
Hermanni Kaartokallio ◽  
Harri Kankaanpää ◽  
Outi Setälä ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Community Composition ◽  
Bacterial Community Composition ◽  
Coastal Sediments ◽  
Polycyclic Aromatic

scholarly journals Influence of Vegetation on the In Situ Bacterial Community and Polycyclic Aromatic Hydrocarbon (PAH) Degraders in Aged PAH-Contaminated or Thermal-Desorption-Treated Soil

2009 ◽  
Vol 75 (19) ◽  
pp. 6322-6330 ◽  
Author(s):  
Aurélie Cébron ◽  
Thierry Beguiristain ◽  
Pierre Faure ◽  
Marie-Paule Norini ◽  
Jean-François Masfaraud ◽  
...  
Keyword(s):  
Bacterial Community ◽  
16S Rrna ◽  
Polycyclic Aromatic Hydrocarbon ◽  
16S Rrna Gene ◽  
Aromatic Hydrocarbon ◽  
Dry Weight ◽  
Rrna Gene ◽  
Degrading Bacteria ◽  
Polycyclic Aromatic

ABSTRACT The polycyclic aromatic hydrocarbon (PAH) contamination, bacterial community, and PAH-degrading bacteria were monitored in aged PAH-contaminated soil (Neuves-Maisons [NM] soil; with a mean of 1,915 mg of 16 PAHs·kg−1 of soil dry weight) and in the same soil previously treated by thermal desorption (TD soil; with a mean of 106 mg of 16 PAHs·kg−1 of soil dry weight). This study was conducted in situ for 2 years using experimental plots of the two soils. NM soil was colonized by spontaneous vegetation (NM-SV), planted with Medicago sativa (NM-Ms), or left as bare soil (NM-BS), and the TD soil was planted with Medicago sativa (TD-Ms). The bacterial community density, structure, and diversity were estimated by real-time PCR quantification of the 16S rRNA gene copy number, temporal thermal gradient gel electrophoresis fingerprinting, and band sequencing, respectively. The density of the bacterial community increased the first year during stabilization of the system and stayed constant in the NM soil, while it continued to increase in the TD soil during the second year. The bacterial community structure diverged among all the plot types after 2 years on site. In the NM-BS plots, the bacterial community was represented mainly by Betaproteobacteria and G ammaproteobacteria. The presence of vegetation (NM-SV and NM-Ms) in the NM soil favored the development of a wider range of bacterial phyla (Alphaproteobacteria, Betaproteobacteria, G ammaproteobacteria, Verrucomicrobia, Actinobacteria, Firmicutes, and Chlorof l exi) that, for the most part, were not closely related to known bacterial representatives. Moreover, under the influence of the same plant, the bacterial community that developed in the TD-Ms was represented by different bacterial species (Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, and Actinobacteria) than that in the NM-Ms. During the 2 years of monitoring, the PAH concentration did not evolve significantly. The abundance of gram-negative (GN) and gram-positive (GP) PAH-degrading bacteria was estimated by real-time PCR quantification of specific functional genes encoding the α subunit of PAH-ring hydroxylating dioxygenase (PAH-RHDα). The percentage of the PAH-RHDα GN bacterial genes relative to 16S rRNA gene density decreased with time in all the plots. The GP PAH-RHDα bacterial gene proportion decreased in the NM-BS plots but stayed constant or increased under vegetation influence (NM-SV, NM-Ms, and TD-Ms).

scholarly journals Abundance, Dynamics, and Biogeographic Distribution of Seven Polycyclic Aromatic Hydrocarbon Dioxygenase Gene Variants in Coastal Sediments of Patagonia

2012 ◽  
Vol 78 (5) ◽  
pp. 1589-1592 ◽  
Author(s):  
Magalí S. Marcos ◽  
Mariana Lozada ◽  
Walter D. Di Marzio ◽  
Hebe M. Dionisi
Keyword(s):  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Marine Environment ◽  
Time Span ◽  
Coastal Sediments ◽  
Gene Variants ◽  
Content Type ◽  
Coastal Marine ◽  
Polycyclic Aromatic ◽  
Dioxygenase Gene

ABSTRACTNovel polycyclic aromatic hydrocarbon dioxygenase gene variants were present in abundances similar to or higher than those ofphnA1fromCycloclasticusspp. at a chronically polluted subantarctic coastal marine environment in Patagonia. These novel gene variants were detected over a 6-year time span and were also present in sediments from temperate Patagonian sites.

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