- Ten Novel Species Belonging to the Genus Flavobacterium, Isolated from Freshwater Environments: F. praedii sp. nov., F. marginilacus sp. nov., F. aestivum sp. nov., F. flavigenum sp. nov., F. luteolum sp. nov., F. gelatinilyticum sp. nov., F. aquiphilum sp. nov., F. limnophilum sp. nov., F. lacustre
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Hyunyoung Jo , Miri S. Park , Yeonjung Lim , Ilnam Kang , Jang-Cheon Cho
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J. Microbiol. 2023;61(5):495-510. Published online May 23, 2023
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DOI: https://doi.org/10.1007/s12275-023-00054-4
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Abstract
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Eleven bacterial strains were isolated from freshwater environments and identified as Flavobacterium based on 16S rRNA
gene sequence analyses. Complete genome sequences of the 11 strains ranged from 3.45 to 5.83 Mb with G + C contents
of 33.41–37.31%. The average nucleotide identity (ANI) values showed that strains IMCC34515T
and IMCC34518 belonged to the same species, while the other nine strains represented each separate species. The ANI values between
the strains and their closest Flavobacterium species exhibited ≤ 91.76%, indicating they represent each novel species. All
strains had similar characteristics such as being Gram-stain-negative, rod-shaped, and contained iso-C15:0 as the predominant
fatty acid, menaquinone-6 as the respiratory quinone, and phosphatidylethanolamine and aminolipids as major polar
lipids. Genomic, phylogenetic, and phenotypic characterization confirmed that the 11 strains were distinct from previously
recognized Flavobacterium species. Therefore, Flavobacterium praedii sp. nov. (IMCC34515T = KACC 22282T = NBRC 114937T),
Flavobacterium marginilacus sp. nov. (IMCC34673T = KACC 22284T = NBRC 114940T), Flavobacterium aestivum sp. nov.
(IMCC34774T = KACC 22285T = NBRC 114941T), Flavobacterium flavigenum sp. nov. (IMCC34775T = KACC22286T = NBRC 114942T),
Flavobacterium luteolum sp. nov. (IMCC34776T = KACC 22287T = NBRC 114943T), Flavobacterium gelatinilyticum sp. nov.
(IMCC34777T = KACC 22288T = NBRC 114944T), Flavobacterium aquiphilum sp.nov. (IMCC34779T = KACC 22289T = NBRC 114945T),
Flavobacterium limnophilum sp. nov. (IMCC36791T = KACC22290T = NBRC 114947T), Flavobacterium lacustre sp. nov.
(IMCC36792T = KACC 22291T = NBRC 114948T), and Flavobacterium eburneipallidum sp. nov. (IMCC36793T = KACC 22292T = NBRC 114949T)
are proposed as novel species.
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Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology
.2023;[Epub] CrossRef
- Isolation and genome analysis of Winogradskyella algicola sp. nov., the dominant bacterial species associated with the green alga Dunaliella tertiolecta
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Jaeho Song , Yeonjung Lim , Hye-Jin Jang , Yochan Joung , Ilnam Kang , Seong-Joo Hong , Choul-Gyun Lee , Jang-Cheon Cho
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J. Microbiol. 2019;57(11):982-990. Published online October 28, 2019
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DOI: https://doi.org/10.1007/s12275-019-9378-y
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Abstract
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Microalgae and bacteria are known to be closely associated in
diverse environments. To isolate dominant bacterial species
associated with a green alga, Dunaliella tertiolecta, a photoreactor
culture of the microalga was investigated using culture-
based and culture-independent approaches. The bacterial
community structure of the algal culture showed that
the most abundant bacterial species under the culture conditions
was related to the genus Winogradskyella. The closely
related amplicon sequences, showing ≥ 99.5% 16S rRNA gene
sequence similarity to one of the isolates, designated IMCC-
33238T, constituted > 49% of the bacterial community and
was therefore regarded as the most dominant species in the
algal culture. Strain IMCC33238T was characterized by Gramstaining-
negative and orange-colored rods. Phylogenetic analyses
of the 16S rRNA genes as well as whole genome sequences
revealed that strain IMCC33238T belonged to Winogradskyella
and shared more than 97.2% 16S rRNA gene sequence
similarity with Winogradskyella species. The strain
contained iso-C15:1 G, iso-C15:0, iso-C15:0 3-OH, and summed
feature 3 (C16:1 ω6c and/or C16:1 ω7c) as major fatty acids and
MK-6 as the predominant quinone. The polar lipids found
in strain IMCC33238T were phosphatidylethanolamine, two
unidentified aminolipids, and three unidentified lipids. The
genome of strain IMCC33238T was 3.37 Mbp in size with
33.9 mol% G + C content and proteorhodopsin. Many genes
encoding folate and vitamin production are considered to play
an important role in the bacteria-algae interaction. On the
basis of phylogenetic and phenotypic characteristics, strain
IMCC33238T represents a novel species in the genus Winogradskyella,
for which the name Winogradskyella algicola sp.
nov. is proposed. The type strain is IMCC33238T (= KACC
21192T = NBRC 113704T).
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International Journal of Systematic and Evolutionary Microbiology
.2023;[Epub] CrossRef - List of new names and new combinations previously effectively, but not validly, published
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International Journal of Systematic and Evolutionary Microbiology
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