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  • Title: Halomonas rituensis sp. nov. and Halomonas zhuhanensis sp. nov., isolated from natural salt marsh sediment on the Tibetan Plateau.
    Author: Gao P, Lu H, Xing P, Wu QL.
    Journal: Int J Syst Evol Microbiol; 2020 Oct; 70(10):5217-5225. PubMed ID: 32816656.
    Abstract:
    Two novel Gram-stain-negative, aerobic and non-motile rods bacteria, designated TQ8ST and ZH2ST, were isolated from salt marsh sediment collected from the Tibetan Plateau. Strain TQ8ST was found to grow at 10-40 °C (optimum, 30 °C), pH 6.0-11.0 (optimum, pH 8.0-9.0) and in the presence of 2-12 % (w/v) NaCl (optimum, 6-8 %). Strain ZH2ST was found to grow at 15-40 °C (optimum, 30 °C), pH 7.0-10.0 (optimum pH 9.0) and in the presence of 2-10 % (w/v) NaCl (optimum, 4-6 %). Phylogenetic analysis based on the 16S rRNA gene sequences showed that strains TQ8ST and ZH2ST shared 99.07 % sequence similarity between each other and were affiliated with the genus Halomonas, sharing 97.48 % and 97.41 % of sequence similarity to their closest neighbour Halomonas sulfidaeris Esulfide1T, respectively. DNA-DNA hybridization analyses showed 61.0 % relatedness between strains TQ8ST and ZH2ST. The average nucleotide identity and the average amino acid identity values between the two genomes were 92.33 and 92.84 %, respectively. The values between the two strains and their close phylogenetic relatives were all below 95 %. The major respiratory quinones of strain TQ8ST were Q-9 and Q-8, while that of ZH2ST was Q-9. The main fatty acids shared by the two strains were C18 : 1  ω6c and/or C18 : 1  ω7c, C16 : 1  ω6c and/or C16 : 1  ω7c, C16 : 0 and C12 : 0 3-OH. Strain ZH2ST can be distinguished from TQ8ST by a higher proportion of C19 : 0 cyclo ω8c. The G+C content of the genomic DNA of strains TQ8ST and ZH2ST were 57.20 and 57.14 mol%, respectively. On the basis of phenotypic distinctiveness and phylogenetic divergence, the two isolates are considered to represent two novel species of the genus Halomonas, for which the names Halomonas rituensis sp. nov (type strain TQ8ST=KCTC 62530T=CICC 24572T) and Halomonas zhuhanensis sp. nov (type strain ZH2ST=KCTC 62531T=CICC 24505T) are proposed.
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