1887

Abstract

Three bacterial strains, designated SSBR10-3, SSTM10-2 and SSHM10-5, were isolated from saltern soil sampled in Jeollanam-do, Republic of Korea. Cells were aerobic, Gram-stain-positive, flagellated and rod-shaped. The strains grew optimally at 28°C and at pH 7.0. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strains SSBR10-3, SSTM10-2 and SSHM10-5 were placed within the genus , showing the highest similarity to FP5 (98.6 %), ‘’ Marseille-Q1234 (98.5 %) and MSS-155 (98.6 %), respectively. The genomic similarity values between strains SSBR10-3, SSTM10-2 and SSHM10-5 and their related species were 17.6–22.6 % for digital DNA–DNA hybridization (dDDH) and 69.6–78.5 % for orthologous average nucleotide identity (OrthoANI), which were lower than the thresholds recommended for species delineation. The dDDH and OrthoANI values among the three strains were below 38.3 and 89.4 %, respectively. Besides the differences in genomic features, strains SSBR10-3, SSTM10-2 and SSHM10-5 were distinct from each other and from members of the genus in terms of phenotypic traits related to substrate assimilation. The cell-wall peptidoglycan contained -diaminopimelic acid, the major fatty acids were anteiso-C, iso-C and anteiso-C, and the predominant menaquinone was MK-7 for all three strains. Diphosphatidylglycerol, phosphatidylglycerol and an unidentified phospholipid were present in their polar lipid profiles. Based on a polyphasic approach incorporating genomic data, strains SSBR10-3, SSTM10-2 and SSHM10-5 represent novel species, for which the names sp. nov. (SSBR10-3=DSM 114353=KACC 21935=NBRC 115504), sp. nov. (SSTM10-2=DSM 114354=KACC 21936=NBRC 115505) and sp. nov. (SSHM10-5=DSM 114355= KACC 21937=NBRC 115506) are proposed.

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2023-10-26
2024-05-08
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