Halorhabdus

Antunes, André, Ferrer, Manuel and Yarza, Pablo (2016) Halorhabdus. In: Whitman, William (ed). Bergey's Manual of Systematics of Archaea and Bacteria. John Wiley & Sons, Inc., pp. 1-9. ISBN 9781118960608

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Abstract

Ha.lo.rhab’dus. Gr. n. hals halos salt; Gr. n. rhabdos rod or stick; N.L. fem. n. Halorhabdus salt(-loving) rod. The genus Halorhabdus, classi ed in the family Halobacteriaceae, order Halobacteriales in the class Halobacteria, consists of highly pleomorphic, Gram- stain-negative cells. Some strains exhibit a predom- inance of cocci- or rod-shaped cells. Strains may produce red or nonpigmented colonies. They are aerobic or facultative anaerobic chemoorganotrophs; some strains display very poor growth under aero- bic conditions, and fermentative capability may be present. Some can grow only on a very narrow range of organic substrates. All are catalase positive, and some show a positive oxidase reaction. Nitrate is reduced to nitrite. Some strains also reduce nitrite. Halorhabdus spp. are extremely halophilic, and cells quickly lyse in water. Magnesium is either not required or only necessary in very small amounts (0.002M). They are thermotolerant, with growth in the range 15–57.5∘C. Poly-β-hydroxybutyrate (PHB) is produced. The res- piratory lipoquinone present is MK-8(VIII-H2); MK-8 is also present in some strains. Different types of diphytanyl ether derivatives are the major polar lipids; phosphatidylglycerol sulfate is always absent. Three species of the genus Halorhabdus have been described and were isolated from a variety of hypersaline environments: sediments in hypersaline lakes (Hrd. utahensis, the type species of the genus), deep-sea brines (Hrd. tiamatea), and salt mine boreholes (Hrd. rudnickae). DNA G+C content: 60.4–62.9% (based on genome sequence); 60.8 – 64.0 mol% (based on HPLC). Type species: Halorhabdus utahensis.

Item Type: Book Section
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Biology
Date Deposited: 30 Aug 2017 14:38
URI: http://repository.edgehill.ac.uk/id/eprint/9451

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