Abstract
A Gram-negative, strictly aerobic, chemoorganotrophic, bacteriochlorophyll a-containing, slow-growing bacterium was isolated from the lichen Flavocetraria nivalis and designated strain BP6-180914 T. Cells of this strain were large nonmotile rods, which reproduced by binary fission. Cells grew under oxic conditions and were able to utilize sugars and several polysaccharides, including starch and pectin. Strain BP6-180914 T was psychrotolerant and moderately acidophilic growing at 4–35 °C (optimum 20–28 °C) and between pH 4.0 and 7.5 (optimum 4.5–5.5). The major fatty acids were C18:1ω7c, C19:0 cyclo, C16:0 and C18:0. The polar lipids were diphosphatidylglycerols, phosphatidylglycerols, phosphatidylethanolamines, phosphatidylcholines, unidentified aminolipids, and a number of glycolipids, the major one being an unidentified glycolipid. The quinone was Q-10. The DNA G + C content was 63.65%. Comparative 16S rRNA gene sequence analysis revealed that strain BP6-180914 T was a member of the order Hyphomicrobiales and belonged to the family Lichenihabitantaceae defined by the lichen-dwelling facultative aerobic chemo-organotroph Lichenihabitans psoromatis (92.7% sequence similarity). The results of phylogenomic and genomic relatedness analyses showed that strain BP6-180914 T could clearly be distinguished from other species in the order Hyphomicrobiales with average nucleotide identity values of < 74.05% and genome-to-genome distance values of < 21.1%. The AAI value of 65.9% between strain BP6-180914 T and L. psoromatis allowed us to assign this strain to the novel genus of the family Lichenihabitantaceae. Therefore, it is proposed that strain BP6-180914 T represents a novel species in a new genus, Lichenifustis flavocetrariae gen. nov., sp. nov.; strain BP6-180914 T (= KCTC 92872 T = VKM B-3641 T = UQM 41506 T) is the type strain.
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The authors confirm that the data supporting the findings of this study are available within the article and its supplementary materials. 16S rRNA gene sequence and draft genome are available in National Center for Biotechnology Information.
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Acknowledgements
The authors thank Dr. Evgeny S. Korchikov (Samara National Research University) for taxonomic identification of the lichen Flavocetraria nivalis; Prof. (Emeritus) Aharon Oren (Hebrew University of Jerusalem) for help with Latin transcription in preparing the protologue; participants of the “Pallada” voyage Andrey A. Feshchuk, Sergey Yu. Romashin, and Lev A. Sergeev for their assistance in collecting lichen specimens.
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TP. designed the study. TP. examined lichen samples, obtained isolates, performed growth experiments; took phase contrast and micro pictures. YML. annotated and analyzed the genome sequences; OS. collected and prepared lichen specimens; ET. prepared ultrathin sections of cells and took pictures; AA. analyzed the composition of fatty acids and quinones; E.I. received data on the composition of lipids; T.P. and Y.M.L. wrote the manuscript.
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Pankratov, T.A., Samylina, O.S., Tikhonova, E.N. et al. A novel bacteriobiont of the Arctic lichen Flavocetraria nivalis, Lichenifustis flavocetrariae gen. nov, sp. nov. demonstrating hydrolytic properties and containing a full set of the Calvin–Benson–Bassham cycle genes. Arch Microbiol 205, 232 (2023). https://doi.org/10.1007/s00203-023-03577-x
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DOI: https://doi.org/10.1007/s00203-023-03577-x