Abstract
Four Gram-staining-negative, aerobic, yellow-pigmented and rod-shaped bacteria, named strains BD1B2-1T, NT2B1T, YF14B1 and DM2B3-1, were isolated from four rhizosphere soil samples of banana in China. Comparison of the 16S rRNA gene sequences showed that all these strains were most closely related to an invalidly published species, ‘Rhodocytophaga rosea’ 172606-1, with similarities ranging from 87.7 to 88.0%. According to the phylogenomic analysis, the four strains were clustered in an independent lineage and closely related to the genus Rhodocytophaga. The genomic sizes of these strains were approximately 9.49–9.77 Mbp with the DNA G + C contents of 38.8–39.0 mol%. They all contained C16:1 ω5c, iso-C15:0 and iso-C17:0 3-OH as the major fatty acids and menaquinone 7 as the only respiratory quinone. They all had phosphatidylethanolamine as the major polar lipids. Based on phenotypic and phylogenomic characteristics, the four strains should represent two novel species within a novel genus, for which the names Xanthocytophaga agilis gen. nov., sp. nov. (BD1B2-1T = GDMCC 1.2890T = JCM 35374T) and Xanthocytophaga flavus sp. nov. (NT2B1T = GDMCC 1.2889T = JCM 35375T) are proposed; the former is assigned as the type species of the novel genus Xanthocytophaga gen. nov. In addition, based on the phenotypic and phylogenomic data, we proposed to reclassify the existing genus Rhodocytophaga in the family Cytophagaceae into a novel family Rhodocytophagaceae fam. nov. The novel family consists of the type genus Rhodocytophaga and the novel genus Xanthocytophaga.
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Data availability
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene of strains BD1B2-1T, NT2B1T, YF14B1 and DM2B3-1 are OR024674, OR024675, OR024673 and OR024672, respectively. The whole genome shotgun projects for strains BD1B2-1T, NT2B1T, YF14B1, DM2B3-1 and Rhodocytophaga aerolata KACC 12507T have been deposited in the GenBank database under the accession numbers JASJOU000000000, JASJOR000000000, JASJOS000000000 JASJOT000000000 and JAUKPO000000000, respectively.
Abbreviations
- AAI:
-
Average amino acid identity
- ANI:
-
Average nucleotide identity
- APL:
-
Unidentified aminophospholipid
- dDDH:
-
Digital DNA-DNA hybridization
- Foc:
-
Fusarium oxysporum F. sp. cubense
- L:
-
Unidentified lipid
- MK-7:
-
Menaquinone 7
- ML:
-
Maximum likelihood
- NJ:
-
Neighbor-joining
- PE:
-
Phosphatidylethanolamine
- POCP:
-
Percentage of conserved proteins
- TSA:
-
Tryptic soy agar
- UBCG:
-
Up-to-data bacteria core genes
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Funding
This work was jointly supported by the Natural Science Foundation of China (32000007), the Science and Technology Program of Guangdong Province (2021B1212050022), the Guangdong Special Support Program (2021JC06N628), the Guangdong Strategic Special Fund for Rural Revitalization (2022-440000-43010104-9463) and the GDAS’ Special Project of Science and Technology Development (2021GDASYL-20210103020).
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HHZ designed the research and project outline. XJZ, YF, YXL and XQD: carried out the experiments. XJZ and YL: performed genome analysis. XJZ, XQD, YQ and HHZ: funding acquisition. XJZ: wrote the manuscript. GDF, YL, QY and HHZ: revised the manuscript. All authors reviewed the manuscript.
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Zhang, X., Feng, GD., Liu, Y. et al. Description of Xanthocytophaga agilis sp. nov. and Xanthocytophaga flavus sp. nov. of the new genus Xanthocytophaga gen. nov and the proposal of Rhodocytophagaceae fam. nov. within the order Cytophagales. Arch Microbiol 205, 345 (2023). https://doi.org/10.1007/s00203-023-03685-8
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DOI: https://doi.org/10.1007/s00203-023-03685-8