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

Volume 76, Issue 2

gen. nov. sp. nov., a novel chitin-degrading bacterium of family isolated from the mangrove sediment No Access

Abstract

A novel bacterial strain with chitin-degrading ability, designated strain HSL-7, was isolated from a mangrove sediment in Guangxi, PR China. Cells of strain HSL-7 were Gram-stain-positive, aerobic, rod-shaped bacteria with a single polar flagellum. The strain grew at concentrations of 0–1% (w/v) NaCl (optimum at 0.5%), at pH 6.0–10.0 (optimum at 7.0) and in a temperature range of 15–37 °C (optimum at 20 °C). Strain HSL-7 shared the highest 16S rRNA gene sequence percentage with BCRC 17254 (94.4%). Phylogenetic analyses based on 16S rRNA gene and genome sequences showed that strain HSL-7 formed a distinct cluster in the family . The genome-relatedness indices between strain HSL-7 and other type species of the family were in the ranges of 75.61–79.73% for average nucleotide identity, 65.50–70.65% for average amino acid identity and 12.7–17.4% for digital DNA–DNA hybridization, which were significantly below the cut-off values for the genus delineation. The genome comprised 3,144,197 bp with a genomic DNA G+C content of 61.5 mol%. The major isoprenoid quinone was ubiquinone-8. The predominant fatty acids were summed feature 3 (C ω and/or C ω), summed feature 8 (C ω and/or C ω) and C. The polar lipids comprised aminolipid, aminophospholipid, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phospholipid and an unidentified lipid. The polyphasic taxonomic properties indicated that the strain represents a novel genus and species in the family for which the name gen. nov., sp. nov. is proposed. The type strain is HSL-7 (=JCM 37906=MCCC 1K09933).

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  • Accepted:
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Keyword(s): chitin-degrading , Chitinirhabdus sediminis , HSL-7T and novel bacterial taxa
Funding
This study was supported by the:
  • the Natural Science Foundation of Guangxi Province (Award Grant No. 2025GXNSFAA069035)
    • Principal Award Recipient: LiyanYang
  • the Guangxi Science and Technology Program (Award Gui Ke Fa [2024] 102-4)
    • Principal Award Recipient: LixiaPan
  • the Basic Science and Research Foundation of Guangxi Academy of Sciences (Award CQ-C-202302)
    • Principal Award Recipient: DengfengYang
  • the National Natural Science Foundation of China (Award Grant No. 32360244)
    • Principal Award Recipient: DengfengYang
  • the National Natural Science Foundation of China (Award Grant No. 32360227)
    • Principal Award Recipient: LixiaPan
  • Science and Technology Major Project of Guangxi (Award Guike AA24206044)
    • Principal Award Recipient: DengfengYang
© 2026 The Authors
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/content/journal/ijsem/10.1099/ijsem.0.007035
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Chitinirhabdus sediminis gen. nov. sp. nov., a novel chitin-degrading bacterium of family Chitinibacteraceae isolated from the mangrove sediment
Int J Syst Evol Microbiol 76, 007035 (2026); https://doi.org/10.1099/ijsem.0.007035
/content/journal/ijsem/10.1099/ijsem.0.007035
/content/journal/ijsem/10.1099/ijsem.0.007035
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