Sphingomonas deserti sp. nov., isolated from Mu Us Sandy Land soil

Massilia phyllostachyos sp. nov., Isolated from the Roots of Moso Bamboo in China

A Gram-negative, strictly aerobic, motile, and rod-shaped bacterial strain G4R7^T was isolated from the roots of moso bamboo (Phyllostachys edulis) in Zhejiang, Hangzhou Province, China. After comparing 16S rRNA gene sequences, strain G4R7^T exhibited the highest similarities with Massilia neuiana PTW21^T (98.3%), followed by M. agri K-3-1^T (98.3%), M. consociate CCUG 58010^T (97.7%), M. niastensis 5516S-1^T (97.7%) and M. yuzhufengensis ZD1-4^T (97.6%). The phylogenetic analysis revealed that strain G4R7^T belonged to the genus Massilia. The draft genome of strain G4R7^T was 5.81 Mb, and the G+C content was 64.4%. The average nucleotide identity values between G4R7^T and another related member of the genus Massilia ranged from 76.6 to 87.2%, and the digital DNA-DNA hybridization ranged from 20.7 to 27.9%. Strain G4R7^T grew at 15-37 °C (optimum 25-30 °C) and pH 6.0-9.0 (optimum pH 7.0) in the presence of 0-3% (w/v) NaCl (optimum 0%). The respiratory quinone was Q-8, and the major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, and aminophospholipid. The major cellular fatty acids were C_10:0 3OH, C_12:0, C_12:0 2OH, and C_16:0, summed feature 3 (C_16:1 ω6c and/or C_16:1 ω7c). As per the data from chemotaxonomic, phylogenetic, and phenotypic evidence, strain G4R7^T represents a new species of genus Massilia, for which the name Massilia phyllostachyos sp. nov. is proposed. The type strain is G4R7^T (=ACCC 61911^T=GDMCC 1.2961^T=JCM 35225^T).

Sphingomonas baiyangensis sp. nov., isolated from water in Baiyang Lake

A novel Gram-stain-negative, short-rod-shaped, orange-pigmented bacterial strain, designated L-1–4 w-11T, was isolated from Baiyang Lake in China. The strain grew at 15–35 °C (optimum 30 °C) and pH 7–8 (optimum pH 7) in TSA medium. The predominant polar lipids of strain L-1–4 w-11T were sphingoglycolipid, phosphatidylethanolamine, phosphatidylcholine, phosphatidylglycerol, diphosphatidylglycerol, one unidentified glycolipid and three unidentified lipids; the major cellular fatty acids were C17 : 1ω6c and summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c); and the major respiratory quinone was ubiquinone 10 (Q-10). Strain L-1–4 w-11T showed the highest 16S rRNA gene sequence similarity to Sphingomonas japonica JCM 15438T (98.3 %) and S. spermidinifaciens GDMCC 1.657T (98.0 %). The draft genome size of strain L-1–4 w-11T was 3.3 Mbp, and the G+C content was 67.8 mol%. Digital DNA–DNA hydridization and average nucleotide identity values between the genome sequences of strain L-1–4 w-11T and S. spermidinifaciens GDMCC 1.657T (76.9 and 21.0 %), S. japonica JCM 15438T (76.0 and 19.9 %) and S. paucimobilis CGMCC 1.12825T (72.8 and 19.6 %) were far below the thresholds for prokaryotic conspecific assignment. With the evidence from the phylogenetic, chemotaxonomic and genotypic analyses, we propose that strain L-1–4 w-11T represents a novel Sphingomonas species with the name S. baiyangensis sp. nov. The type strain is L-1–4 w-11T (=CGMCC 1.13572T=JCM 33962T).

Arthrobacter crusticola sp. nov., Isolated from Biological Soil Crusts in the Mu Us Sandy Land, China

Mu Us Sandy Land in China is a very fragile ecological environment due to serious desertification. While attempting to gain insights into the biodiversity of biological soil crusts of Mu Us Sandy Land, a novel bacterial strain, SLN-3^T, was isolated. It was phylogenetically placed into the genus Arthrobacter within the family Micrococcaceae based on its 16S rRNA gene sequence. The most closely related species were Arthrobacter ruber MDB1-42^T (98.6%) and Arthrobacter agilis DSM 20550^T (98.3%). Cells of the novel species were Gram-stain-positive, aerobic, and non-endospore-forming. The values of average nucleotide identity and the digital DNA-DNA hybridization between SLN-3^T and MDB1-42^T were 84.9% and 21.3%, respectively. The draft genome size of strain SLN-3^T was 3.67 Mb, and its genomic G+C content was 68.1%. The predominant cellular fatty acids were anteiso-C_15:0 and C_17:0 anteiso. Glucose, galactose, and ribose were the whole-cell sugars. The polar lipids consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, glycolipid, and phospholipid. The peptidoglycan contained lysine, glutamic acid, and alanine. The predominant menaquinone was MK-9(H₂). Based on the data from the chemotaxonomic, phylogenetic, and phenotypic evidence, a novel species named Arthrobacter crusticola sp. nov is proposed, whose type strain is SLN-3^T (= ACCC 61595^T = JCM 33723^T).

Sphingomonas suaedae sp. nov., a chitin-degrading strain isolated from rhizosphere soil of Suaeda salsa

A Gram-stain-negative, aerobic, chitin-degrading, motile bacterial strain with a single polar flagellum, designated XS-10T, was isolated from saline soil sampled from the rhizosphere of Suaeda salsa, Tumd Right Banner, Inner Mongolia, PR China. Strain XS-10T grew at 10–40 °C (optimum, 35 °C), pH 5.0–9.0 (optimum, pH 8.0) and 0–12.5% NaCl (optimum 2.0 %). The phylogenetic analysis based on both the 16S rRNA gene and the phylogenomic tree revealed that strain XS-10T formed a clade with Sphingomonas turrisvirgatae MCT13T and Sphingomonas koreensis JSS-26T, sharing 98.4 and 97.5 % 16S rRNA gene similarities to S. koreensis JSS-26T and S. turrisvirgatae MCT13T, respectively. Spermidine and Q-10 were the major polyamine and the major respiratory quinone, respectively. The major polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, sphingoglycolipid, two unidentified lipids and an unidentified aminophospholipid. The major fatty acids were summed feature 8 (C18 : 1  ω7c and/or C18 : 1  ω6c), C16 : 0 and C17 : 1  ω6c. The genome of strain XS-10T consisted of a 4 154 291 bp chromosome with a DNA G+C content of 65.5 mol%. The average nucleotide identity, average amino acid identity and digital DNA–DNA hybridization values of strain XS-10T with S. turrisvirgatae MCT13T and S. koreensis JSS-26T were 77.8 and 78.6 %, 75.9 and 76.3 %, and 22.0 and 22.9 %, respectively. Based on the phylogenetic, phenotypic, and genotypic characteristics, strain XS-10T is considered to represent a novel species of the genus Sphingomonas , for which the name Sphingomonas suaedae sp. nov. is proposed. The type strain is XS-10T (=CGMCC 1.17078T=JCM 33850T).