Candidatus Thiovulum sp. strain imperiosus: the largest free-living Epsilonproteobacteraeota Thiovulum strain lives in a marine mangrove environment - Université des Antilles Access content directly
Journal Articles Canadian Journal of Microbiology Year : 2022

Candidatus Thiovulum sp. strain imperiosus: the largest free-living Epsilonproteobacteraeota Thiovulum strain lives in a marine mangrove environment

Marie-Noëlle Sylvestre
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Patrick Jean-Louis
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Adrien Grimonprez
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Philippe Bilas
Amandine Collienne
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Catherine Azède
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Abstract

A large (47.75 ± 3.56 µm in diameter) Thiovulum bacterial strain forming white veils is described from a marine mangrove ecosystem. High sulfide concentrations (up to 8 mM of H 2 S) were measured on sunken organic matter (wood/bone debris) under laboratory conditions. This sulfur-oxidizing bacterium colonized the organic matter, forming a white veil. According to conventional scanning electron microscope (SEM) observations, bacterial cells are ovoid and slightly motile by numerous small flagella present on the cell surface. Large intracytoplasmic internal sulfur granules were observed, suggesting a sulfidic-based metabolism. Observations were confirmed by elemental sulfur distribution detected by energy-dispersive X-ray spectroscopy (EDXS) analysis using an environmental scanning electron microscope (ESEM) on non-dehydrated samples. Phylogenetic analysis of the partial sequence of 16S rDNA obtained from purified fractions of this Epsilonproteobacteraeota strain indicates that this bacterium belongs to the Thiovulaceae cluster and could be one of the largest Thiovulum ever described. We propose to name this species Candidatus Thiovulum sp. strain imperiosus.

Dates and versions

hal-03644165 , version 1 (18-04-2022)

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Olivier Gros, Marie-Noëlle Sylvestre, Patrick Jean-Louis, Adrien Grimonprez, Philippe Bilas, et al.. Candidatus Thiovulum sp. strain imperiosus: the largest free-living Epsilonproteobacteraeota Thiovulum strain lives in a marine mangrove environment. Canadian Journal of Microbiology, 2022, 68 (1), pp.17-30. ⟨10.1139/cjm-2021-0101⟩. ⟨hal-03644165⟩
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