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  • Title: Streptomyces longhuiensis sp. nov, a novel species isolated from soil of Lilium brownii in Hunan Province, PR China.
    Author: Li K, Man Y, Chen X, Liu J, Jiang H, Liu Z, Ma H, Zhu H, Zhou Y, Zhang C, Zhou X.
    Journal: Int J Syst Evol Microbiol; 2023 Mar; 73(3):. PubMed ID: 37000634.
    Abstract:
    An actinobacterium strain, designated BH-MK-02T, was isolated from the soil of Lilium brownii. The taxonomic position was determined using a polyphasic approach. Strain BH-MK-02T grew well on International Streptomyces Project series media and formed well-developed, branched substrate hyphae and aerial mycelium that differentiated into straight spore chains with a wrinkled surface. The diagnostic diamino acid was ll-diaminopimelic acid. The major menaquinones were MK-9(H4), MK-9(H6) and MK-9(H8). The polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylinositol mannosides, phosphatidylglycerol and unidentified lipid spots. The predominant fatty acids were anteiso-C15 : 0, iso-C16 : 0, C16 : 0 and C16 : 1  ω7c/C16 : 1  ω6c. The phenotypic characteristics of strain BH-MK-02T indicated that it belonged to the genus Streptomyces. Phylogenetic analysis based on the 16S rRNA gene sequence indicated that strain BH-MK-02T was most closely related to Streptomyces aureus CGMCC 4.1833T (99.7 %). However, the average nucleotide identity and digital DNA-DNA hybridization values between the whole-genome sequences of strain BH-MK-02T and S. aureus CGMCC 4.1833T were 78.1 and 23.2 %, respectively, below the 96.7 and 70 % cut-off points respectively recommended for delineating Streptomyces species. Furthermore, the novel isolate could be distinguished from S. aureus CGMCC 4.1833T by morphological, physiological and biochemical characteristics. Based on all these data, strain BH-MK-02T (=MCCC 1K06237T=JCM 34789T) clearly represents a novel species within the genus Streptomyces, for which the name Streptomyces longhuiensis sp. nov. is proposed.
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