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A Gram-stain-negative, heterotrophic, aerobic, non-motile, rod-shaped bacterial strain (GW1-59 T ) belonging to the genus Lysobacter was isolated from coastal sediment collected from the Chinese Great Wall Station, Antarctica. The strain was identified using a polyphasic taxonomic approach. The strain grew well on Reasoner's 2A media and could grow in the presence of 0-4 % (w/v) NaCl (optimum, 1 %), at pH 9.0-11.0 and at 15-37 °C (optimum, 30 °C). Strain GW1-59 T possessed ubiquinone-8 as the sole respiratory quinone. The major phospholipids were diphosphatidylglycerol, phosphatidylglycerol and phosphatidylethanolamine. The major fatty acids were summed feature 9 (10-methyl C 16 : 0 and/or iso-C 17 : 1  ω 9 c ), iso-C 15 : 0 , iso-C 16 : 0 , iso-C 17 : 0 , C 16 : 0 and iso-C 11 : 0 3-OH. DNA-DNA relatedness with Lysobacter concretionis Ko07 T , the nearest phylogenetic relative (98.5 % 16S rRNA gene sequence similarity) was 23.4 % (21.1-25.9 %). The average nucleotide identity value between strain GW1-59 T and L. concretionis Ko07 T was 80.1 %. The physiological and biochemical results and low level of DNA-DNA relatedness suggested the phenotypic and genotypic differentiation of strain GW1-59 T from other Lysobacter species. On the basis of phenotypic, phylogenetic and genotypic data, a novel species, Lysobacter antarcticus sp. nov., is proposed. The type strain is GW1-59 T (=CCTCC AB 2019390 T =KCTC 72831 T ).

A polyphasic taxonomic study was carried out on strains CHu50b-3-2 T and CHu40b-3-1 isolated from a 67 cm-long sediment core collected from the Daechung Reservoir at a water depth of 17 m, Daejeon, Republic of Korea. The cells of the strains were Gram-stain-negative, non-spore-forming, non-motile and rod-shaped. Comparative 16S rRNA gene sequence studies showed a clear affiliation of two strains with γ-Proteobacteria , which showed the highest pairwise sequence similarities to Lysobacter hankyongensis KTce-2 T (96.5 %), Lysobacter pocheonensis Gsoil193 T (96.3 %), Lysobacter ginsengisoli Gsoil 357 T (96.1 %), Lysobacter solanacearum T20R-70 T (96.1 %), Lysobacter brunescens KCTC 12130 T (95.4 %) and Lysobacter capsici YC5194 T (95.3 %). The phylogenetic analysis based on 16S rRNA gene sequences showed that the strains formed a clear phylogenetic lineage with the genus Lysobacter . The major fatty acids were identified as summed feature 9 (iso-C 17 : 1  ω 9 c and/or C 18 : 1 10-methyl), iso-C 15 : 0 , iso-C 16 : 0 and iso-C 17 : 0 . The respiratory quinone was identified as ubiquinone Q-8. The major polar lipids were phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine and an unidentified phospholipid. The genomic DNA G+C content was determined to be 66.8 mol% (genome) for strain CHu50b-3-2 T and 66.4 mol% (HPLC) for strain CHu40b-3-1. Based on the combined genotypic and phenotypic data, we propose that strains CHu50b-3-2 T and CHu40b-3-1 represent a novel species of the genus Lysobacter , for which the name Lysobacter profundi sp. nov. is proposed. The type strain is CHu50b-3-2 T (=KCTC 72973 T =CCTCC AB 2019129 T ). Besides Lysobacter panaciterrae Gsoil 068 T formed a phylogenetic group together with strain Luteimonas aquatica RIB1-20 T (EF626688) that is clearly separated from all other known Lysobacter strains. Based on the phylogenetic relationships together with fatty acid compositions, Lysobacter panaciterrae Gsoil 068 T should be reclassified as a member of the genus Luteimonas: Luteimonas aquatica comb. nov. (type strain Gsoil 068 T =KCTC 12601 T =DSM 17927 T ).

An aerobic and Gram-stain-negative bacterial strain, designated UKS-15 T , was isolated from lake water in the Republic of Korea. Results of 16S rRNA gene sequence and phylogenetic analyses indicated that the novel isolate belongs to the genus Lysobacter and was most closely related to Lysobacter xinjiangensis RCML-52 T (98.0 %), Lysobacter mobilis 9 NM-14 T (97.4 %) and Lysobacter humi FJY8 T (97.2 %). The DNA G+C content was 69.1 mol%. Strain UKS-15 T possessed ubiquinone-8 (Q-8) as the sole respiratory quinone and the fatty acid profile comprised iso-C 15 : 0 , iso-C 17 : 0 and summed feature 9 (iso-C 17 : 1 ω9 c and/or C 16 : 0 10-methyl) as its major components. The major polar lipids were phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol and one unidentified aminophospholipid. Moreover, the physiological and biochemical results and low level of DNA-DNA relatedness (<22.0 %) allowed the phenotypic and genotypic differentiation of strain UKS-15 T from other Lysobacter species. Therefore, on the basis of the data from this polyphasic taxonomic study, strain UKS-15 T should represent a novel species of the genus Lysobacter , for which the name Lysobacter lacus sp. nov. is proposed. The type strain is UKS-15 T (=JCM 30983 T =KACC 18719 T ).

Two novel strains, designated KTCe-2T and 7C-9T, isolated from an activated sludge and freshwater sediment, respectively in South Korea, were characterized by a polyphasic approach to clarify their taxonomic positions. Phylogenetic analysis based on 16S rRNA gene sequences indicated that both isolates belong to the genus Lysobacter and are most closely related to 'Lysobacter daecheongensis' Dae 08 (98.5 % and 97.6 % similarity for strains KTCe-2T and 7C-9T, respectively), Lysobacter brunescens KCTC 12130T (98.4 % and 97.2 %), and Lysobacter oligotrophicus JCM 18257T (97.1 % and 96.8 %). The G+C content of the genomic DNA of strains KTCe-2T and 7C-9T was 68.6 % and 71.5 mol%, respectively. Strains KTCe-2T and 7C-9T possessed ubiquinone-8 as the sole respiratory quinone, and a fatty acid profile with iso-C15 : 0 and iso-C16 : 0 as the major fatty acids supported the affiliation of the two strains to the genus Lysobacter. Moreover, the physiological and biochemical results and low DNA-DNA relatedness values allowed the phenotypic and genotypic differentiation of strains KTCe-2T and 7C-9T from other species of the genus Lysobacter with validly published names. Therefore, the two isolates represent two novel species of the genus Lysobacter, for which the name Lysobacter hankyongensis sp. nov. (type strain KTCe-2T = JCM 18204T = KACC 16618T) and Lysobacter sediminicola sp. nov. (type strain 7C-9T = JCM 18205T = KACC 16617T) are proposed.

A Gram-negative, aerobic, rod shaped, non-spore-forming bacterial strain, designated Dae08(T), was isolated from sediment of the stream near Daechung dam in South Korea, and was characterized in order to determine its taxonomic position, using a polyphasic approach. Comparative 16S rRNA gene sequence analysis showed that strain Dae08(T) belongs to the family Xanthomonadaceae of the Gammaproteobacteria, and is related to Lysobacter brunescens ATCC 29482(T) (97.3%). The phylogenetic distances from any other species with validly published names within the genus Lysobacter were greater than 3.7%. The G+C contents of the genomic DNA of strain Dae08(T) was 69.3 mol%. The detection of a quinone system with Q-8 as the predominant compound and a fatty acid profile with iso-C(15:0), iso-C(17:1), omega9c, iso-C(17:0), iso-C(16:0), and iso-C(11:0) 3-OH as the major acids supported the affiliation of strain Dae08(T) to the genus Lysobacter. DNA-DNA relatedness between strain Dae08(T) and its phylogenetically closest neighbour was 28%. On the basis of its phenotypic properties and phylogenetic distinctiveness, strain Dae08(T) (= KCTC 12600(T)) should be classified in the genus Lysobacter as the novel species, for which the name Lysobacter daecheongensis sp. nov. is proposed.