Description of Fabibacter halotolerans gen. nov., sp. nov. and Roseivirga spongicola sp. nov., and reclassification of [Marinicola] seohaensis as Roseivirga seohaensis comb. nov

Stanley C K Lau, Mandy M Y Tsoi, Xiancui Li, Ioulia Plakhotnikova, Sergey Dobretsov, Madeline Wu, Po Keung Wong, Joseph R. Pawlik, Pei Yuan Qian

Research output: Contribution to journalArticle

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Abstract

Bacterial strains UST030701-097T and UST030701-084T were isolated from a marine sponge in the Bahamas. Both strains were pink-pigmented, Gram-negative, strictly aerobic and chemo-organotrophic. Cells of strain UST030701-097T were short, curved rods with fast-gliding motility, whereas those of strain UST030701-084T were straight rods with a less rapid gliding motion. The two strains had MK-7 as the major respiratory quinone and did not produce flexirubin-type pigments. The DNA G + C contents of strains UST030701-097Tand UST030701-084T were 42.5 and 43.7 mol%, respectively. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the two strains belonged to the family 'Flexibacteraceae' of the phylum Bacteroidetes. 16S rRNA gene sequence similarity between strains UST030701-097T and UST030701-084T was 95-0 %; their closest relative was [Marinicola) seohaensis, with 93.3 % and 96-0% sequence similarity, respectively. Phylogenetic tree topology indicated that the two strains belonged to the same lineage, but were on separate branches. Whilst strain UST030701-084T and [Marinicola] seohaensis were found on one branch, strain UST030701-097T was in another branch that had no species with validly published names. Based on the polyphasic taxonomic data obtained in the present study, we propose that strain UST030701-097T represents a novel genus and that strain UST030701-084T represents a novel species in the phylum Bacteroidetes. The genus Fabibacter gen. nov. is proposed, with strain UST030701-097T (= NRRL B-41220T =JCM 13334T) as the type strain of the type species, Fabibacter halotolerans sp. nov. Strain UST030701-084T (= NRRL B-41219T=JCM 13337T) is proposed as the type strain of Roseivirga spongicola sp. nov. In an earlier study, it was suggested that the genus Marinicola is a later heterotypic synonym of the genus Roseivirga. However, a formal proposal to reclassify [Marinicola] seohaensis, the only member of the genus Marinicola, has not yet been made. The results of phylogenetic analyses in this study support the reclassification of [Marinicola] seohaensis as Roseivirga seohaensis comb. nov.

Original languageEnglish
Article number64104
Pages (from-to)1059-1065
Number of pages7
JournalInternational Journal of Systematic and Evolutionary Microbiology
Volume56
Issue number5
DOIs
Publication statusPublished - May 2006

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Bacteroidetes
Comb and Wattles
taxonomic revisions
rRNA Genes
Cytophagaceae
gliding
Bahamas
phylogenetics
new species
Base Composition
Porifera
Names
gene
motility
sponge
topology
pigment
DNA
phylogeny
ribosomal RNA

ASJC Scopus subject areas

  • Microbiology
  • Applied Microbiology and Biotechnology
  • Ecology, Evolution, Behavior and Systematics
  • Immunology

Cite this

Description of Fabibacter halotolerans gen. nov., sp. nov. and Roseivirga spongicola sp. nov., and reclassification of [Marinicola] seohaensis as Roseivirga seohaensis comb. nov. / Lau, Stanley C K; Tsoi, Mandy M Y; Li, Xiancui; Plakhotnikova, Ioulia; Dobretsov, Sergey; Wu, Madeline; Wong, Po Keung; Pawlik, Joseph R.; Qian, Pei Yuan.

In: International Journal of Systematic and Evolutionary Microbiology, Vol. 56, No. 5, 64104, 05.2006, p. 1059-1065.

Research output: Contribution to journalArticle

Lau, Stanley C K ; Tsoi, Mandy M Y ; Li, Xiancui ; Plakhotnikova, Ioulia ; Dobretsov, Sergey ; Wu, Madeline ; Wong, Po Keung ; Pawlik, Joseph R. ; Qian, Pei Yuan. / Description of Fabibacter halotolerans gen. nov., sp. nov. and Roseivirga spongicola sp. nov., and reclassification of [Marinicola] seohaensis as Roseivirga seohaensis comb. nov. In: International Journal of Systematic and Evolutionary Microbiology. 2006 ; Vol. 56, No. 5. pp. 1059-1065.
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abstract = "Bacterial strains UST030701-097T and UST030701-084T were isolated from a marine sponge in the Bahamas. Both strains were pink-pigmented, Gram-negative, strictly aerobic and chemo-organotrophic. Cells of strain UST030701-097T were short, curved rods with fast-gliding motility, whereas those of strain UST030701-084T were straight rods with a less rapid gliding motion. The two strains had MK-7 as the major respiratory quinone and did not produce flexirubin-type pigments. The DNA G + C contents of strains UST030701-097Tand UST030701-084T were 42.5 and 43.7 mol{\%}, respectively. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the two strains belonged to the family 'Flexibacteraceae' of the phylum Bacteroidetes. 16S rRNA gene sequence similarity between strains UST030701-097T and UST030701-084T was 95-0 {\%}; their closest relative was [Marinicola) seohaensis, with 93.3 {\%} and 96-0{\%} sequence similarity, respectively. Phylogenetic tree topology indicated that the two strains belonged to the same lineage, but were on separate branches. Whilst strain UST030701-084T and [Marinicola] seohaensis were found on one branch, strain UST030701-097T was in another branch that had no species with validly published names. Based on the polyphasic taxonomic data obtained in the present study, we propose that strain UST030701-097T represents a novel genus and that strain UST030701-084T represents a novel species in the phylum Bacteroidetes. The genus Fabibacter gen. nov. is proposed, with strain UST030701-097T (= NRRL B-41220T =JCM 13334T) as the type strain of the type species, Fabibacter halotolerans sp. nov. Strain UST030701-084T (= NRRL B-41219T=JCM 13337T) is proposed as the type strain of Roseivirga spongicola sp. nov. In an earlier study, it was suggested that the genus Marinicola is a later heterotypic synonym of the genus Roseivirga. However, a formal proposal to reclassify [Marinicola] seohaensis, the only member of the genus Marinicola, has not yet been made. The results of phylogenetic analyses in this study support the reclassification of [Marinicola] seohaensis as Roseivirga seohaensis comb. nov.",
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AU - Lau, Stanley C K

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AU - Li, Xiancui

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AU - Dobretsov, Sergey

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AU - Wong, Po Keung

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