Abstract
A white-coloured bacterium, designated strain GTJR-20T, was isolated from a stem of Phytolacca acinosa Roxb. collected from Taibai Mountain in Shaanxi Province, north-west China, and was subjected to a taxonomic study by using a polyphasic approach. The novel isolate was found to grow optimally at 28–30 °C, at pH 7.5–8.0 and in the absence of NaCl. Cells were observed to be Gram-stain positive, strictly aerobic, rod-shaped and non-motile. The predominant respiratory quinone was identified as MK-7(H4) and the major cellular fatty acids were identified as iso-C16:0 (35.8 %), C18:1 ω9c (17.7 %), C17:1 ω6c (11.0 %), C17:1 ω8c (7.8 %) and C18:3 ω6c (6, 9, 12) (7.2 %). The DNA G+C content was determined to be 71.6 mol %. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain GTJR-20T is a member of the genus Solirubrobacter and is closely related to Solirubrobacter phytolaccae GTGR-8T (16S rRNA gene sequence similarity, 98.4 %), Solirubrobacter soli KCTC 12628T (97.8 %), Solirubrobacter pauli KCTC 9974T (97.7 %) and Solirubrobacter ginsenosidimutans KCTC 19420T (97.6 %). No other recognized bacterial species showed more than 94.6 % 16S rRNA gene sequence similarity to the novel isolate. DNA–DNA relatedness values for strain GTJR-20T with respect to its closely related neighbours S. phytolaccae GTGR-8T, S. soli KCTC 12628T, S. pauli KCTC 9974T and S. ginsenosidimutans KCTC 19420T were 48.3 ± 8.6, 21.3 ± 5.2, 36.8 ± 6.2 and 36.0 ± 5.5 %, respectively. Based on the phenotypic, phylogenetic and genotypic data, strain GTJR-20T is considered to represent a novel species of the genus Solirubrobacter, for which the name Solirubrobacter taibaiensis sp. nov. is proposed. The type strain is GTJR-20T (=CCTCC AB 2013308T = KCTC 29222T).
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This work was supported by the National High Technology Research and Development Program of China (863 program, Grant 2013AA102802), the National Natural Science Foundation of China (Grant No. 31100001) and the Natural Science Foundation of Shaanxi Province, China (Grant No. 2012JQ3006).
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Lei Zhang and Lingfang Zhu have contributed equally to this work.
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Zhang, L., Zhu, L., Si, M. et al. Solirubrobacter taibaiensis sp. nov., isolated from a stem of Phytolacca acinosa Roxb.. Antonie van Leeuwenhoek 106, 279–285 (2014). https://doi.org/10.1007/s10482-014-0194-4
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DOI: https://doi.org/10.1007/s10482-014-0194-4