Department of Microbiology and Molecular Biology, College of Bioscience and Biotechnology, Chungnam National University, 99, Daehak-ro, Yuseong, Daejeon 34134, Republic of Korea.
Int J Syst Evol Microbiol. 2021 Nov;71(11). doi: 10.1099/ijsem.0.005082.
Two Gram-staining-negative, aerobic, rod-shaped bacteria designated strains SR9 and UL070, were isolated from soil and subjected to taxonomic characterization. Strain SR9 grew at 10-37 °C (optimum 30 °C), at pH 4.0-10.0 (optimum pH 8.0) and in the presence of 0-1 % NaCl (optimum 0 %), and UL070 at 4-33 °C (optimum 30 °C), at pH 4.0-10.0 (optimum pH 7.0) and in the presence of 0-2 % NaCl (optimum 0 %), respectively. Strain UL070 was motile with flagella. Analysis of 16S rRNA gene sequences indicated that the two strains fell into phylogenetic clusters belonging to the genus . Both strains SR9 and UL070 were mostly related to S1-A32-2 with 99.70 and 99.01% sequence similarities, and the similarity between the two isolates was 98.90 %. The genome-based analyses indicated that each of the strains SR9 and UL070 was clearly separated from other species of , as the orthologous average nucleotide identity (OrthoANI) and the digital DNA-DNA hybridization (dDDH) values were no higher than 93.09 and 50.03% respectively with any related species, which were clearly below the cutoff for species distinction. The fatty acid profiles of the two strains mainly consisting of unsaturated components, the presence of ubiquinone 9 (Q-9) as the major respiratory quinone, and phosphatidylethanolamine (PE) and diphosphatidylglycerol (DPG) as the diagnostic polar lipids were consistent with their classification into . The DNA G+C contents of strains SR9 and UL070 were 63.2 mol% and 63.6 mol% respectively. On the basis of both phenotypic and phylogenetic evidences, each of the isolated strains should be classified as a novel species, for which the names sp. nov. (type strain=SR9=KCTC 82228=JCM 34509) and sp. nov. (type strain=UL070=KCTC 82229=JCM 34510) are proposed.
两株革兰氏阴性、需氧、杆状细菌,分别命名为 SR9 株和 UL070 株,从土壤中分离出来,并进行了分类鉴定。SR9 株在 10-37°C(最佳 30°C)、pH4.0-10.0(最佳 pH8.0)和 0-1%NaCl(最佳 0%)的条件下生长,UL070 株在 4-33°C(最佳 30°C)、pH4.0-10.0(最佳 pH7.0)和 0-2%NaCl(最佳 0%)的条件下生长。UL070 株具有运动性,有鞭毛。16S rRNA 基因序列分析表明,两株菌均属于 属的进化枝。菌株 SR9 和 UL070 与 S1-A32-2 的相似性最高,分别为 99.70%和 99.01%,两株菌之间的相似性为 98.90%。基于基因组的分析表明,菌株 SR9 和 UL070 与其他 属的种都明显分离,因为它们的直系同源平均核苷酸同一性(OrthoANI)和数字 DNA-DNA 杂交(dDDH)值均不高于 93.09%和 50.03%,与任何相关种均低于种间区分的界限。两株菌的脂肪酸图谱主要由不饱和成分组成,主要呼吸醌为泛醌 9(Q-9),极性脂为磷脂酰乙醇胺(PE)和双磷脂酰甘油(DPG),这与它们被归入 属的分类一致。菌株 SR9 和 UL070 的 DNA G+C 含量分别为 63.2mol%和 63.6mol%。基于表型和系统发育证据,每一株分离株都应被归类为一个新种,分别命名为 sp. nov.(模式株=SR9=KCTC 82228=JCM 34509)和 sp. nov.(模式株=UL070=KCTC 82229=JCM 34510)。