Abstract
A novel bacterial strain designated as ADMK78T was isolated from the saline desert soil. The cells were rod-shaped, Gram-stain-negative, and non-motile. The strain ADMK78T grows best at 28 °C. Phylogeny of 16S rRNA gene placed the strain ADMK78T with the members of genera Ciceribacter and Rhizobium, while the highest sequence similarity was with Rhizobium wuzhouense W44T (98.7%) and Rhizobium ipomoeae shin9-1 T (97.9%). Phylogenetic analysis based on 92 core-genes extracted from the genome sequences and average amino acid identity (AAI) revealed that the strain ADMK78T forms a distinct cluster including five species of Rhizobium, which is separate from the cluster of the genera Rhizobium and Ciceribacter. We propose re-classification of Rhizobium ipomoeae, R. wuzhouense, R. rosettiformans and R. rhizophilum into the novel genus Peteryoungia. The average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values of ADMK78T were less than 82 and 81%, respectively, among all type strains included in the genus Peteryoungia. The strain ADMK78T showed differences in physiological, phenotypic, and protein profiles estimated by MALDI-TOF MS to its closest relatives. Based on the phenotypic, chemotaxonomic properties, and phylogenetic analyses, the strain ADMK78T represents a novel species, Peteryoungia desertarenae sp. nov. The type strain is ADMK78T (= MCC 3400T; KACC 21383T; JCM 33657T). We also proposed the reclassification of Rhizobium daejeonense, R. naphthalenivorans and R. selenitireducens, into the genus Ciceribacter, based on core gene phylogeny and AAI values.
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Data availability
The GenBank accession number for the 16S rRNA gene sequence of strain ADMK78T is MK942856. The draft genome sequence has been deposited in GenBank under the accession number CP058350-CP058352.
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Acknowledgements
The authors thank Prof. Aharon Oren, Department of Plant and Environmental Sciences, The Hebrew University of Jerusalem, Israel, and Prof. Bernhard Schink, Department of Biology, University of Konstanz, Germany, for their expert suggestions concerning the correct species name, species epithet and Latin etymology. Authors also thank Prof J Peter W Young, University of York, to grant us permission to propose new genus Peteryoungia. The authors acknowledge the financial support of the Department of Biotechnology (BT/Coord. II/01/03/2016).
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Financial support by the Department of Biotechnology (BT/Coord. II/01/03/2016) and (BT/PR8218/BCE/8/1044/2013).
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MK: methodology, formal analysis, validation; AH and AP: methodology, formal analysis; AN and KJ methodology, isolation; DM and YS funding acquisition; PR conceptualization, methodology, data curation, formal analysis, supervision, and writing.
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Rahi, P., Khairnar, M., Hagir, A. et al. Peteryoungia gen. nov. with four new species combinations and description of Peteryoungia desertarenae sp. nov., and taxonomic revision of the genus Ciceribacter based on phylogenomics of Rhizobiaceae. Arch Microbiol 203, 3591–3604 (2021). https://doi.org/10.1007/s00203-021-02349-9
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DOI: https://doi.org/10.1007/s00203-021-02349-9