Halanaerobium sehlinense sp. nov., an extremely halophilic, fermentative, strictly anaerobic bacterium from sediments of the hypersaline lake Sehline Sebkha

Author:

Abdeljabbar Hedi12,Cayol Jean-Luc1,Ben Hania Wajdi1,Boudabous Abdellatif2,Sadfi Najla2,Fardeau Marie-Laure1

Affiliation:

1. Laboratoire de Microbiologie IRD235, MEB, UMR7294, Aix-Marseille Université, ESIL, Case 925, 163 Avenue de Luminy, 13288 Marseille Cedex 9, France

2. Laboratoire Microorganismes et Biomolécules Actives, Faculté des Sciences de Tunis, Université de Tunis El Manar 2092, Tunisia

Abstract

A strictly anaerobic, extremely halophilic, Gram-positive, rod-shaped bacterium was isolated from the hypersaline (>20 % NaCl) surface sediments of Sehline Sebkha in Tunisia. The strain, designated 1SehelT, was strictly halophilic and proliferated at NaCl concentrations of between 5 % and 30 % (saturation), with optimal growth at 20 % NaCl. Strain 1SehelT was non-spore-forming, non-motile, appearing singly or in pairs, or occasionally as long chains and measured 0.5–0.8 µm by 3–10 µm. Strain 1SehelT grew optimally at pH values of 7.4 but had a very broad pH range for growth (pH 5.2–9.4). It grew at temperatures between 20 and 50 °C with an optimum at 43 °C. Strain 1SehelT required yeast extract for growth. The isolate fermented glucose, galactose, fructose, glycerol, mannose, maltose, ribose, pyruvate and sucrose. The fermentation products from glucose utilization were lactate, acetate, formate, ethanol, CO2 and H2. The G+C ratio of the DNA was 32.7 mol%. The major fatty acids were C15 : 1ω6c/7c, C16 : 1ω7c, C16 : 0 and C15 : 0. On the basis of phylogenetic and physiological properties, strain 1SehelT ( = DSM 25582T = JCM 18213T) is proposed as the type strain of Halanaerobium sehlinense sp. nov., within the family Halanaerobiaceae .

Funder

Ministry for Scientific, Technology and Development

Publisher

Microbiology Society

Subject

General Medicine,Ecology, Evolution, Behavior and Systematics,Microbiology

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