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Abstract

Two Gram-stain-negative, Fe(III)-reducing, facultatively anaerobic, motile via a single polar flagellum, rod-shaped bacterial strains, designated IMCC35001 and IMCC35002, were isolated from tidal flat sediment and seawater, respectively. Results of 16S rRNA gene sequence analysis showed that IMCC35001 and IMCC35002 shared 96.6 % sequence similarity and were most closely related to FUT3661 (98.6 %) and Asr22-7 (96.8 %), respectively. Draft genome sequences of IMCC35001 and IMCC35002 revealed 4.0 and 4.8 Mbp of genome size with 61.0 and 51.8 mol% of DNA G+C content, respectively. Average nucleotide identity (ANI) and digital DNA–DNA hybridization (dDDH) values between the two strains were 73.1 and 19.8 %, respectively, indicating that they are separate species. The two genomes showed ≤84.4 % ANI and ≤27.8 % dDDH to other species of the genus , suggesting that the two strains each represent novel species. The two strains contained both menaquinone (MK-7) and ubiquinones (Q-7 and Q-8). Major fatty acids of strain IMCC35001 were iso-C, C 9, C 8 and C and those of strain IMCC35002 were C 9, C and summed feature 3 (C 7 and/or C 6). Major polar lipids in both strains were phosphatidylethanolamine, phosphatidylglycerol, unidentified phospholipid, unidentified aminophospholipid and unidentified lipids. The two strains reduced Fe(III) citrate, Fe(III) oxyhydroxide, Mn(IV) oxide and sodium selenate but did not reduce sodium sulfate. They were also differentiated by several phenotypic characteristics. Based on the polyphasic taxonomic data, IMCC35001 and IMCC35002 were considered to represent each novel species in the genus , for which the names sp. nov. (IMCC35001=KACC 21161=NBRC 113699) and (IMCC35002=KACC 21162=NBRC 113700) sp. nov. are proposed.

Funding
This study was supported by the:
  • Ministry of Oceans and Fisheries (Award 20180430)
    • Principle Award Recipient: Juchan Hwang
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2020-07-31
2024-12-03
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