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Haloanaerobium lacusroseus sp. nov., an Extremely Halophilic Fermentative Bacterium from the Sediments of a Hypersaline Lake

¹ Laboratoire de Microbiologic ORSTOM, Université de Provence, 13331 Marseille Cedex 3, France
³ Unité des Entérobactéries, INSERM U199, Institut Pasteur, 75724 Paris Cedex 15, France
⁴ Laboratoire de Microbiologic, Université Blaise Pascal, 63177 Aubiére Cedex, France
² Faculty of Science and Technology, Griffith University, Brisbane, Queensland 4111, Australia

^* Corresponding author. Mailing address: Laboratoire de Microbiologic ORSTOM, Université de Provence, 3 Place Victor Hugo, 13331 Marseille Cedex 3, France. Phone: (33) 91.10.64.80. Fax: (33) 91.10.64.81. Electronic mail address: rogerpa{at}loma.orstom.fr.

ABSTRACT

A new extremely halophilic chemoorganotrophic bacterium (strain H200^T [T = type strain]) was isolated from the hypersaline sediments of Retba Lake in Senegal. This organism was a sluggishly motile, rod-shaped, non-spore-forming, gram-negative, obligate anaerobe that grew optimally at 40°C in the presence of 180 to 200 g of NaCl per liter. The DNA base composition was 32 mol% guanine plus cytosine. The fermentation products from glucose were ethanol, acetate, H², and CO². Yeast extract was required for growth. The fermentable substrates included d-fructose, galactose, d-xylose, cellobiose, lactose, maltose, sucrose, starch, d-mannitol, glycerol, and Casamino Acids. On the basis of the results of a 16S rRNA sequence analysis, strain H200^T was found to be related to Haloanaerobium species. The 16S rRNA sequence of strain H200^T differed from the sequences of the three previously described Haloanaerobium species, and strain H200^T also differed from these organisms in its NaCl range for growth (60 to 340 g/liter); strain H200^T grew in the presence of the highest NaCl concentration recorded for any halophilic anaerobic organism, including the three previously described Haloanaerobium species. We propose that strain H200^T (= DSM 10165) belongs to a new Haloanaerobium species, Haloanaerobium lacusroseus.

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