Thermomonas mangrovi sp. nov., isolated from soil of a mangrove nature reserve

A Gram-stain-negative, non-motile, aerobic and ovoid-rod-shaped bacterial strain, designated as 2C3345^T, was isolated from soil of a mangrove nature reserve in Shenzhen, PR China and its taxonomic position was investigated. The 16S rRNA gene sequence of strain 2C3345^T exhibited the highest similarity value to that of the type strains Thermomonas aquatica NBRC 113114^T (98.4 %), Thermomonas carbonis KCTC 42013^T (98.1 %), Thermomonas brevis DSM 15422^T (98.0 %) and Thermomonas haemolytica DSM 13605^T (97.9 %). Strain 2C3345^T grew optimally at 28-30 °C, pH 7.0 and without NaCl. The predominant ubiquinone in 2C3345^T was identified as Q-8. The major fatty acids of 2C3345^T were iso-C_15 : 0, iso-C_16 : 0 and summed feature 9 (is0-C_17:1ω9c and/or 10-methyl C_16:0). The major polar lipids of 2C3345^T were phosphatidylcholine (PC), phosphatidylglycerol (PG), diphosphatidglycerol (DPG), phosphatidylethanolamine (PE), an unidentified phospholipid, an unidentified aminolipid and two unidentified lipids. The DNA G+C content of strain 2C3345^T was 69.9 %. The draft genome sequence of 2C3345^T included 2 888 645 bp in total (N50=310 730 bp) with a medium read coverage of 388.6×and 21 scaffolds. In silico DNA-DNA hybridisation with type strains of species of the genus Thermomonas showed 24.4, 22.4, 24.1 and 23.2% relatedness to T. aquatica NBRC 113114^T, T. carbonis KCTC 42013^T, T. brevis DSM 15422^T and T. haemolytica DSM 13605^T, respectively. And the average nucleotide identity by blast (ANIb) values between 2C3345^T and these four reference strains were 81.9, 80.0, 81.2 and 80.6 %, respectively, lower than the 95-96% threshold value for dividing prokaryotic species. On the basis of its phenotypic, chemotaxonomic, phylogenetic and phylogenomic properties, strain 2C3345^T is considered to represent a novel species within the genus Thermomonas, for which the name Thermomonas mangrovi sp. nov. is proposed. The type strain is 2C3345^T (=KCTC 92730^T =MCCC 1K08335^T).

Thermomonas paludicola sp. nov., isolated from a lotus wetland

A Gram-stain-negative, aerobic, rod-shaped and motile bacterium, designated IMCC34681^T, was isolated from a lotus wetland in the Republic of Korea. Cellular growth occurred at 10-37 °C (optimum, 30 °C), pH 6-9 (optimum, pH 7) and with 0-2 % (w/v) NaCl (optimum, 0.5 % NaCl). The results of 16S rRNA gene sequence analysis indicated that IMCC34681^T represented a member of the genus Thermomonas, sharing 95.3-96.9 % similarities with type strains of species of the genus. The whole-genome sequence of IMCC34681^T was 2.72 Mbp in size with 66.2 % DNA G+C content. The IMCC34681^T genome shared the highest average nucleotide identity (ANI) value, 82.8 %, with that of Thermomonas brevis KACC 16975^T among species of the genus Thermomonas, indicating that the strain represents a novel genomic species. The major respiratory quinone of the strain was ubiquinone-8 (Q-8) and the predominant cellular fatty acids were iso-C_15 : 0 (25.7 %) and iso-C_14 : 0 (20.8 %). The strain harboured diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine and an unidentified lipid as major fatty polar lipids. On the basis of the phylogenetic, phenotypic, chemotaxonomic and genomic characteristics, IMCC34681^T was assigned to the genus Thermomonas as the type strain of a novel species, for which the name Thermomonas paludicola sp. nov. is proposed. The type strain is IMCC34681^T (=KACC 21793^T=NBRC 114635^T).