Sphingomonas panaciterrae sp. nov., a plant growth-promoting bacterium isolated from soil of a ginseng field
2015
Sukweenadhi, Johan | Kim, Yeon-Ju | Kang, Chang Ho | Farh, Mohamed El-Agamy | Nguyễn, Ngọc Lan | Hoang, Van-An | Choi, Eul-Su | Yang, Deok-Chun
Strain DCY91ᵀ, a Gram-stain-negative, rod-shaped, aerobic, non-motile bacterium, was isolated from soil of ginseng field in Gyeonggi province, South Korea. Strain DCY91ᵀ shared the highest 16S rRNA gene sequence similarity with Sphingomonas mucosissima DSM 17494ᵀ (98.55 %), Sphingomonas dokdonensis KACC 17420ᵀ (98.11 %) and Sphingomonas xinjiangensis DSM 26736ᵀ (96.68 %). The strain DCY91ᵀ was found to able to grow best in trypticase soy agar at 28 °C, at pH 7 and at 0.5 % NaCl. Ubiquinone 10 was identified as the isoprenoid quinone. The major polar lipids were identified as sphingoglycolipid, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol and phosphatidylcholine. The major fatty acids of strain DCY91ᵀ were identified as unsaturated C₁₈:₁ ω7c and saturated C₁₆:₀. The major polyamine content was sym-homospermidine. The DNA G + C content was determined to be 65.8 mol% (HPLC). After 6 days of incubation, strain DCY91ᵀ produced 9.64 ± 1.73 and 33.73 ± 4.66 µg/ml indole-3-acetic acid, using media without L-tryptophan and supplemented with L-tryptophan, respectively. Strain DCY91ᵀ was also weakly solubilized phosphate and produced siderophores. On the basis of the phenotypic characteristics, genotypic analysis and chemotaxonomic characteristics, strain DCY91ᵀ is considered to represent a novel species of the genus Sphingomonas, for which the name Sphingomonas panaciterrae sp. nov. is proposed. The type strain is DCY91ᵀ (=KCTC 42346ᵀ =JCM 30807ᵀ).
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