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. 2016 Mar;23(5):4046-53.
doi: 10.1007/s11356-015-4314-0. Epub 2015 Mar 14.

Analysis of a population of magnetotactic bacteria of the Gulf of Gabès, Tunisia

Nathalie Pradel  1   2 , Jean-Luc Cayol  3 , Marie-Laure Fardeau  3 , Fatma Karray  4   5 , Sami Sayadi  4   5 , Didier Alazard  3 , Bernard Ollivier  3   5
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Analysis of a population of magnetotactic bacteria of the Gulf of Gabès, Tunisia

Nathalie Pradel et al. Environ Sci Pollut Res Int. 2016 Mar.

Abstract

The occurrence of magnetotactic bacteria (MTB) on a Tunisian marine coast exposed to heavy metals pollution (Sfax, Gulf of Gabès, Mediterranean Sea) was investigated. The MTB population of this Southern Mediterranean coast was compared to the MTB populations previously investigated on the French Northern Mediterranean coast. A dominant MTB coccus morphotype was observed by microscopy analysis. By pyrosequencing technology, the analysis of the 16S ribosomal RNA (rDNA) revealed as much as 33 operational taxonomic sequence units (OTUs) close to sequences of MTB accessible in the databases. The majority were close to MTB sequences of the "Med group" of α-Proteobacteria. Among them, a dominant OTU_001 (99 % of the MTB sequences) affiliated within the Magnetococcales order was highlighted. Investigating the capacities of this novel bacterium to be used in bioremediation and/or depollution processes could be envisaged.

Keywords: Magnetococcales; Marine magnetotactic bacteria; Tunisian Mediterranean coast.

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