title: Halogeometricum rufum sp. nov., a halophilic archaeon from a marine solar saltern, and emended description of the genus Halogeometricum.
abstract: Two halophilic archaea, strains RO1-4(T) and RO1-64, were isolated from a marine solar saltern in Jiangsu, China. Cells of the two strains were pleomorphic, motile, and stained Gram-negative. Colonies were red-pigmented. Strains RO1-4(T) and RO1-64 were able to grow at 25-55 °C (optimum 40-42 °C), at 2.1-5.1 M NaCl (optimum 3.9 M NaCl), at 0.05-0.7 M MgCl(2) (optimum 0.3 M MgCl(2)) and at pH 6.0-8.5 (optimum pH 7.0). Cells lyse in distilled water and the minimal NaCl concentration to prevent cell lysis is 12 % (w/v). On the basis of 16S rRNA gene sequence analysis, strains RO1-4(T) and RO1-64 were closely related to Halogeometricum borinquense PR3(T) (98.0 and 98.2 % similarity, respectively) and Halosarcina pallida BZ256(T) (97.8 and 97.9 %). The major polar lipids of the two strains were phosphatidylglycerol, phosphatidylglycerol phosphate methyl ester and two glycolipids (S-DGD-1 and DGD-1). The DNA G+C contents of strains RO1-4(T) and RO1-64 are 64.9 and 62.4 mol%, respectively. The DNA-DNA hybridization value between strains RO1-4(T) and RO1-64 was 83.0 % and both strains showed low DNA-DNA relatedness with Halogeometricum borinquense PR3(T) (42.5 and 50.1 % relatedness, respectively) and Halosarcina pallida BZ256(T) (37.6 and 42.1 % relatedness). It was concluded that strains RO1-4(T) and RO1-64 represent a novel species of the genus Halogeometricum, for which the name Halogeometricum rufum sp. nov. is proposed. The type strain is RO1-4(T) (=CGMCC 1.7736(T) =JCM 15770(T)).
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China.
authors.forename: Heng-Lin
authors.initials: HL
authors.lastname: Cui
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China.
authors.forename: Xin
authors.initials: X
authors.lastname: Yang
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China.
authors.forename: Xia
authors.initials: X
authors.lastname: Gao
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China.
authors.forename: Xin-Yi
authors.initials: XY
authors.lastname: Li
authors.affiliation: Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, PR China.
authors.forename: Xue-Wei
authors.initials: XW
authors.lastname: Xu
authors.affiliation: Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China.
authors.forename: Yu-Guang
authors.initials: YG
authors.lastname: Zhou
authors.affiliation: Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China.
authors.forename: Hong-Can
authors.initials: HC
authors.lastname: Liu
authors.affiliation: Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China.
authors.forename: Pei-Jin
authors.initials: PJ
authors.lastname: Zhou
mesh_terms: D019641:DNA, Archaeal / Q000235:genetics; D006216:Halobacteriaceae / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012623:Seawater / Q000382:microbiology*; D012965:Sodium Chloride / Q000378:metabolism*
chemical_list: D019641:DNA, Archaeal; D012336:RNA, Ribosomal, 16S; D012965:Sodium Chloride