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sp. nov., isolated from paddy soil. | LitMetric

sp. nov., isolated from paddy soil.

Int J Syst Evol Microbiol

Institute of Microbial Ecology & Resources, Mokwon University, 88, Doanbuk-ro, Seo-gu, Daejeon, Republic of Korea.

Published: October 2020

AI Article Synopsis

  • Two new species of actinobacteria, AO-9 and AO-18, were isolated from paddy soil in Daejeon, South Korea, characterized as Gram-positive, motile, and non-spore-forming.
  • Through phylogenetic analysis using 16S rRNA gene sequences, these strains displayed high sequence similarity to known species but were determined to be novel based on DNA-DNA hybridization and average nucleotide identity.
  • Key features include their specific fatty acid composition, predominant quinone MK-9 (H), and a DNA G+C content of 72.9 mol%, leading to the proposal of the new species name.

Article Abstract

Two Gram-stain-positive, facultatively anaerobic, motile, aerobic, rod-shaped and non-spore-forming actinobacteria, strains AO-9 and AO-18, were isolated from paddy soil collected from Daejeon, Republic of Korea. Colonies were smooth, lemon-yellow and circular and 0.5-0.8×2.0-2.4 µm in diameter after 3 days of incubation at 28 °C on tryptic soy agar. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strains AO-9 and AO-18 belonged to the genus , showing the highest sequence similarities to FXJ8.089 (96.6 %), SYSUP0004 (96.5 %), DSM 20111 (96.2 %), DSM 20107 (96.1 %), NEAU-TCZ24 (96.1 %), TR7-06 (96.0 %), JCM 18111 (96.0 %) and less than 96 % to other closely related species. The DNA-DNA hybridization values between strains AO-9 and AO-18 were 87 %. The average nucleotide identity and digital DNA-DNA hybridization values between strain AO-9 and type strains of related species of the genus were 84.0-85.8 % and 20.3-20.9 %, respectively. The major cellular fatty acids are anteiso-C (49.9 %), C (12.9 %) and iso-C (12.1 %). The predominant isoprenoid quinone was MK-9 (H). The polar lipid profile consists of diphosphatidylglycerol, phosphatidylglycerol and one unidentified lipid. The DNA G+C content was 72.9 mol%. Based on its distinctive phenotypic, phylogenetic and chemotaxonomic characteristics, the two strains are considered to represent novel species of the genus , for which the name sp. nov. is proposed. The type strain is AO-9 (=KACC 19069=NBRC 112523).

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Source
http://dx.doi.org/10.1099/ijsem.0.004409DOI Listing

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