Sphingobium pinisoli sp. nov., isolated from the rhizosphere soil of a Korean native pine tree
A Gram-stain negative, aromatic compound degrading bacterium, designated strain ASA28T, was isolated from the rhizosphere soil of a pine tree at Anmyon island, Taean in Korea. Strain ASA28T was found to be strictly aerobic, non-motile, short rods which can grow at 15–28 °C (optimum, 25–28 °C), at pH 5.0–11.0 (optimum, pH 7.0) and at salinities of 0–1.0% (w/v) NaCl (optimum, 0% NaCl). Phylogenetic analyses based on 16S rRNA gene sequences indicated that strain ASA28T belongs to the genus Sphingobium, showing high sequence similarity to Sphingobium scionense WP01T (97.8%), Sphingobium vermicocomposti VC-230T (96.8%), Sphingobium yanoikuyae ATCC 51230T (96.5%) and Sphingobium herbicidovorans MHT (95.6%). The predominant ubiquinone and polyamine components were identified as Q-10 and spermidine, respectively. The major fatty acids were identified as C18:1ω7c, C16:0, C14:0 2-OH and C16:1ω7c and/or C15:0 iso 2-OH. The major polar lipids were identified as diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylmonomethylethanolamine, phosphatidylcholine, sphingoglycolipid, phosphoglycolipid, four unidentified aminophospholipids, an unidentified aminolipid, two unidentified phospholipids and six unidentified lipids. The DNA G+C content of this novel isolate was determined to be 63.0 mol%. DNA–DNA relatedness between strain ASA28T and S. herbicidovorans KCTC 2939T, S. vermicocomposti DSM 21299T and S. scionense DSM 19371T was determined to be 32 ± 5%, 30 ± 4% and 25 ± 5%, respectively. On the basis of the phylogenetic, phenotypic and chemotaxonomic analyses in this study, strain ASA28T is considered to represent a novel species of the genus Sphingobium, for which the name Sphingobium pinisoli sp. nov. is proposed. The type strain is ASA28T (= KACC 18700T = NBRC 112246T).
KeywordsSphingobium pinisoli sp. nov. Forest soil Pine rhizosphere Taxonomy
This work was carried out with the support of ‘Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ01287601)’ Rural Development Administration, Republic of Korea.
Compliance with ethical standards
Conflict of interest
The authors declare that there are no conflicts of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
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