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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo International Journal of Systematic and Evolutionary Microbiology

Volume 75, Issue 4

sp. nov., with yellow diffusible pigment No Access

Abstract

An actinomycete, designated strain Q6, was isolated from tea plant rhizosphere soil sample in Hefei, China. Strain Q6 produced straight chains of smooth-surfaced spores and grew well on International Project 1–7 media. Phenotypic and genotypic analyses indicated that strain Q6 represented a member of the genus . The 16S rRNA gene sequence data of strain Q6 indicated that strain Q6 had the highest sequence similarity to CRXT-Y-14 (98.9%), JCM 4913 (98.9%) and NRRL B-24165 (98.9%), followed by WH-9 (98.8%), MA-4680 (98.6%) and NBRC 14463 (98.6%). The phylogenomic tree, using the genome blast distance phylogeny method, showed that strain Q6 represents a new branch among the and has the closest genetic relationship with 80–3024. The diagnostic diamino acid was -diaminopimelic acid. The major menaquinones were MK-9 (H), MK-9 (H) and MK-8 (H). The dominant fatty acids were C (18.6%), iso-C (18.3%), anteiso-C (15.4%) and summed feature 3 (C 7c and/or C 6c; 13.8%). The main polar lipids were diphosphatidylglycerol, phosphatidylinositol, phosphatidylethanolamine (PE) and phosphatidylinositol mannoside. The DNA G+C content of strain Q6 was 71.3 mol%. Average nucleotide identity and digital DNA–DNA hybridization values between the genome sequence of strain Q6 and its closely related type strains were 77.0–87.5% and 22.4–29.7%, respectively. On the basis of these data, strain Q6 represents a novel species within the genus , for which the name sp. nov. is proposed. The type strain is strain Q6 (=CGMCC 4.7886=NBRC 116061).

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): new taxa , Streptomyces , Streptomyces citrinus and taxonomy
Funding
This study was supported by the:
  • State Key Laboratory of Tea Plant Biology and Utilization (Award SKLTOF20220119)
    • Principal Award Recipient: EndongYang
  • the Natural Science Foundation of the Higher Education Institutions of Anhui Province, China (Award KJ2021A0169)
    • Principal Award Recipient: Le-NiSun
  • the Natural Science Foundation of the Higher Education Institutions of Anhui Province, China (Award 2024AH050477)
    • Principal Award Recipient: EndongYang
© 2025 The Authors
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Streptomyces citrinus sp. nov., with yellow diffusible pigment
Int J Syst Evol Microbiol 75, 006745 (2025); https://doi.org/10.1099/ijsem.0.006745
/content/journal/ijsem/10.1099/ijsem.0.006745
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