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. 2024 Jan 23;117(1):25.
doi: 10.1007/s10482-023-01920-2.

Polyphasic characterization and genomic insights into Nocardioides turkmenicus sp. nov. isolated from a desert soil

Hayrettin Saygin  1   2 , Kiymet Guven  3 , Demet Cetin  4 , Nevzat Sahin  5
Affiliations

Polyphasic characterization and genomic insights into Nocardioides turkmenicus sp. nov. isolated from a desert soil

Hayrettin Saygin et al. Antonie Van Leeuwenhoek. .

Abstract

Strain KC13T, a novel desert-adapted, non-motile, Gram-stain-positive, rod-shaped, aerobic bacterium, was isolated from a soil sample collected from the Karakum Desert, Turkmenistan and characterised by a polyphasic approach. Phylogenetic analysis based on 16S rRNA sequences revealed that strain KC13T was a member of the genus Nocardioides, and formed a distinct cluster with Nocardioides luteus DSM 43366T (99.3% sequence identity), Nocardioides albus DSM 43109T (98.9%), Nocardioides panzhihuensis DSM 26487T (98.3%) and Nocardioides albertanoniae DSM 25218T (97.9%). The orthologous average nucleotide identity and digital DNA-DNA hybridization values were in the range of 85.8-91.0% and 30.2-35.9%, respectively, with the type strains of closely related species. The genome size of strain KC13T was 5.3 Mb with a DNA G + C content of 69.7%. Comprehensive genome analyses showed that strain KC13T, unlike its close relatives, had many genes associated with environmental adaptation. Strain KC13T was found to have chemotaxonomic and phenotypic characteristics of members of the genus Nocardioides and some differences from phylogenetic neighbours. Based on the chemotaxonomic, genomic, phenotypic and phylogenetic data, strain KC13T represents a novel species of the genus Nocardioides, for which the name Nocardioides turkmenicus sp. nov. is proposed, and the type strain is KC13T (= JCM 33525T = CGMCC 4.7619T).

Keywords: Actinomycetota; Environmental adaptation; Karakum desert; Nocardioides sp. nov.; Whole-genome analysis.

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