Mongoliitalea daihaiensis sp. nov., isolated from Daihai Lake in Inner Mongolia
2022
Jiang, Kai | Yuan, Bo | Cao, Chun Ling | Zhang, Chen Ying | Li, Ruo Xuan | An, Yan
A novel Gram-negative strain, designated X100-76ᵀ, was isolated from Daihai Lake in Inner Mongolia, Republic of China. The strain was non-motile, non-spore-forming, long-rod-shaped, oxidase positive and catalase positive. Colonies incubated at 33 °C on 2216 marine agar medium for 3 days were circular, smooth, transparent, convex with clear edges, orange-red in colour and approximately 1.0 mm in diameter. Growth occurred at pH 6.5–12 (optimum pH 7.5), in 0–5.0% (w/v) NaCl (optimum 1.5%, w/v) and at 4–40 °C (optimum 28–33 °C). Phylogenetic analysis based on 16S rRNA gene sequences showed that X100-76ᵀ belongs to the genus Mongoliitalea and is most closely related to Mongoliitalea lutea MIM18ᵀ with 98.3% sequence similarity. The total genome size of X100-76ᵀ was 4,816,617 bp with a G + C content of 39.6%. The digital DNA–DNA hybridization and average nucleotide identity values between strain X100-76ᵀ and M. lutea MIM18ᵀ were both below the recommended cut-off values. Chemotaxonomic analysis revealed iso-C₁₅:₀, Sum Feature 4 (anteiso-C₁₇:₁ B and/or iso-C₁₇:₁ I), C₁₅:₁ω6c, Sum Feature 9 (C₁₆:₀ 10-methyl and/or iso-C₁₇:₁ω9c), C₁₆:₀ and iso-C₁₅:₁ G as the major fatty acids, menaquinone MK-7 as the major isoprenoid quinone, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine and phosphatidylinositol as the major cellular polar lipids. The results of polyphasic analysis demonstrated that X100-76ᵀ represents a novel species within the genus Mongoliitalea, for which the name Mongoliitalea daihaiensis sp. nov. is proposed. The type strain is X100-76ᵀ (= CGMCC 1.18762ᵀ = KCTC 82458ᵀ).
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