ArticleBMC microbiology2026
Genome sequencing and comparative analysis of Nocardiopsis moroccensis sp. nov., a halotolerant Actinomycetota from Moroccan hypersaline ecosystem.
Article in BMC microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Saline and arid ecosystems are recognized as promising reservoirs of novel Actinomycetota with unique adaptations and secondary metabolic potential. In this study, a halotolerant Actinomycetota strain, designated ZS3416R2A, was isolated from saline soil in the hypersaline wetland of Lake Zima, Morocco. Phylogenetic analysis based on the 16S rRNA gene sequence showed 99.03% similarity to Nocardiopsis terrae DSM 45157 T, indicating close affiliation with the genus Nocardiopsis. Whole-genome sequencing revealed a 6.1 Mb circular chromosome with a G + C content of 70.48% and 5,855 coding sequences. Genome-based metrics (ANI 95.07%, dDDH 66.4%) supported its classification as a novel species distinct from N. terrae, while AAI (95.87%) and POCP (82.4%) confirmed its placement within the genus. Comparative analyses revealed unique gene families, biosynthetic gene clusters, and regions of genomic plasticity in strain ZS3416R2A. Phenotypically, strain ZS3416R2A grew over a broad range of salinity (0–10%), temperature (16–37 °C), and pH (7.0–8.0), and formed denser aerial mycelia than strain DSM 45157 T, reflecting adaptation to the arid saline environment of Lake Zima. Chemotaxonomic characterization identified MK-10(H6), MK-10(H4) and MK-9(H4) as predominant menaquinones, iso-C16:0 and 10-methyl-C18:0 as major fatty acids, and diphosphatidylglycerol, phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, and phosphatidylinositol as major polar lipids. Based on this polyphasic evidence, strain ZS3416R2A represents a novel species within the genus Nocardiopsis, for which the name Nocardiopsis moroccensis sp. nov. is proposed. The type strain is ZS3416R2AT (= CCMM B1332T = DSM 120542 T).
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