1887

Abstract

An aerobic, Gram-stain-negative, rod-shaped and non-motile strain (XY-359) was isolated from the mouth of a marine invertebrate species from the South China Sea. It grew at pH 6.0–8.5 (optimum, pH 7.5), at 15−37 °C (optimum, 30 °C) and in the presence of 0.5–4.5 % (w/v) NaCl (optimum, 2.5 %). It could not hydrolyse Tweens 20, 40, 60 or 80 and no flexirubin-type pigments were produced. The major polar lipids were phosphatidylethanolamine, one unidentified aminolipid, six unidentified phospholipids and two unidentified polar lipids. The major fatty acids were iso-C 3-OH, iso-C G and iso-C 3-OH. The respiratory quinone was MK-6. Strain XY-359 showed the greatest degree of 16S rRNA sequence similarity to AsT0115 (96.54 %), followed by DSM 22638 (96.27 %). Phylogenetic analysis based on 16S rRNA gene sequences and 31 core genes indicated that strain XY-359 belongs to the genus . The genome size of strain XY-359 was 4 207 872 bp, with 39.1 mol% of DNA G+C content. The average nucleotide identity and digital DNA–DNA hybridization values between strain XY-359 and AsT0115 were 74.58 % and 18.5 %, respectively, and those between strain XY-359 and DSM 22638 were 74.2 % and 18.3 %. The combined phenotypic, chemotaxonomic and phylogenetic data suggest that strain XY-359 represents a novel species of the genus , for which the name sp. nov. is proposed. The type strain is XY-359 (=MCCC 1K03658 =KCTC 72218). Moreover, based on the proposal of nesting and within by García (Validation List No. 193) and the analyses of phylogenetic trees and average amino acid identities in this study, the transfers of , and to the genus as comb. nov., nom. nov. and nom. nov., respectively, are proposed, with an emended description of the genus .

Funding
This study was supported by the:
  • the Scientific and Technical Innovation Council of Shenzhen (Award JCYJ20180305123932369)
    • Principle Award Recipient: NotApplicable
  • the Shenzhen Science and Technology Application Demonstration Project (Award KJYY20180201180253571)
    • Principle Award Recipient: ApplicableNot
  • the 62st-class General Financial Grant from the China Postdoctoral Science Foundation (Award No. 2017M622754)
    • Principle Award Recipient: NotApplicable
  • Scientific and Technical Innovation Council of Shenzhen (Award KQJSCX20170727101743831)
    • Principle Award Recipient: NotApplicable
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2021-09-13
2021-09-24
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