1887

Abstract

An extremely halophilic archaeon, strain IC35, was isolated from a mud sample of the Aran-Bidgol salt lake in Iran. The novel strain was cream, non-motile, rod-shaped and required at least 2.5 M NaCl, but not MgCl, for growth. Optimal growth was achieved with 3.4 M NaCl and 0.1 M MgCl. The optimum pH and temperature for growth were pH 7.0 (grew over a pH range of 6.5–9.0) and 40 °C (grew over a temperature range of 30–50 °C), respectively. Analysis of 16S rRNA gene sequences revealed that strain IC35 clustered with species of the genus , with sequence similarities of 97.3 %, 96.6 % and 96.3 %, respectively, to IC38, EJ-46 and XH-70. The rpoB′ gene similarities between the novel strain and IBRC-M 10022, JCM 13892 and JCM 14624 were 90.2 %, 90.2 % and 89.9 %, respectively. The polar lipid pattern of strain IC35 consisted of phosphatidylglycerol and phosphatidylglycerol phosphate methyl ester; six unknown glycolipids and two minor phospholipids were also observed. The only quinone present was MK-8 (II-H). The GC content of the genomic DNA was 63.2 mol%. DNA–DNA hybridization studies (29 % hybridization with IBRC-M 10022), as well as biochemical and physiological characterization, allowed strain IC35 to be differentiated from other species of the genus . A novel species, sp. nov., is therefore proposed to accommodate this strain. The type strain is IC35 ( = IBRC-M 10256 = KCTC 4050).

Funding
This study was supported by the:
  • Research Council, University of Tehran and Iranian Biological Resource Centre (IBRC) (Award MI-1388-01)
  • Spanish Ministerio de Economía y Competitividad
  • European Funds (FEDER) (Award CGL2013-46941-P)
  • Junta de Andalucía (Award P10-CVI-6226)
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2015-01-01
2024-04-24
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