- Rasiella rasia gen. nov. sp. nov. within the family Flavobacteriaceae isolated from seawater recirculating aquaculture system
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Seong-Jin Kim , Young-Sam Kim , Sang-Eon Kim , Hyun-Kyoung Jung , Jeeeun Park , Min-Ju Yu , Kyoung-Ho Kim
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J. Microbiol. 2022;60(11):1070-1076. Published online October 17, 2022
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DOI: https://doi.org/10.1007/s12275-022-2099-7
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A novel bacterium designated RR4-40T was isolated from a
biofilter of seawater recirculating aquaculture system in Busan,
South Korea. Cells are strictly aerobic, Gram-negative, irregular
short rod, non-motile, and oxidase- and catalase-negative.
Growth was observed at 15–30°C, 0.5–6% NaCl (w/v),
and pH 5.0–9.5. The strain grew optimally at 28°C, 3% salinity
(w/v), and pH 8.5. The phylogenetic analysis based on
16S rRNA gene sequences showed that strain RR4-40T was
most closely related to Marinirhabdus gelatinilytica NH83T
(94.16% of 16S rRNA gene similarity) and formed a cluster
with genera within the family Flavobacteriaceae. The values
of the average nucleotide identity (ANI), digital DNA-DNA
hybridization (dDDH), and average amino acid identity (AAI)
between genomes of strain RR4-40T and M. gelatinilytica
NH83T were 72.91, 18.2, and 76.84%, respectively, and the
values against the strains in the other genera were lower than
those. The major fatty acids were iso-C15:0 (31.34%), iso-C17:0
3-OH (13.65%), iso-C16:0 3-OH (10.61%), and iso-C15:1 G
(10.38%). The polar lipids comprised phosphatidylglycerol,
diphosphatidylglycerol, aminophospholipid, aminolipid, glycolipid,
and sphingolipid. The major respiratory quinone was
menaquinone-6 (MK-6) and the DNA G + C content of strain
RR4-40T was 37.4 mol%. According to the polyphasic analysis,
strain RR4-40T is considered to represent a novel genus within
the family Flavobacteriaceae, for which the name Rasiella
rasia gen. nov, sp. nov. is proposed. The type strain is RR4-40T
(= KCTC 52650T = MCCC 1K04210T).
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Citations
Citations to this article as recorded by  - Robiginitalea rubriflava sp. nov. and Robiginitalea insularis sp. nov., isolated from coastal seawaters of the Yellow Sea
Seungyeop Oh, Yeonjung Lim, Meora Rajeev, Jang-Cheon Cho
Journal of Microbiology.2026; 64(2): e2512009. CrossRef -
Mesohalobacter salilacus sp. nov., a novel halotolerant, flexirubin-type pigment-producing bacterium of the family Flavobacteriaceae
Shuai-Bo Han, Yang-Huan Yu, Xiao-Long He, Jin-Jia Liang, Min Wu, Can Chen, Xue-Wei Xu
International Journal of Systematic and Evolutionary Microbiology
.2025;[Epub] CrossRef - Rhodobacteraceae are Prevalent and Ecologically Crucial Bacterial Members in Marine Biofloc Aquaculture
Meora Rajeev, Jang-Cheon Cho
Journal of Microbiology.2024; 62(11): 985. CrossRef - Validation List no. 215. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology
.2024;[Epub] CrossRef
- Pikeienuella piscinae gen. nov., sp. nov., a novel genus in the family Rhodobacteraceae
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Jeeeun Park , Young-Sam Kim , Seong-Jin Kim , Sang-Eon Kim , Hyun-Kyoung Jung , Min-Ju Yu , Young Jae Jeon , Kyoung-Ho Kim
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J. Microbiol. 2021;59(6):546-551. Published online April 20, 2021
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DOI: https://doi.org/10.1007/s12275-021-0678-7
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1,081
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A novel bacterium, designated strain RR4-56T, was isolated
from a biofilter of a seawater recirculating aquaculture system.
The 16S rRNA gene sequence analysis showed that the
isolate was closely related to Halovulum dunhuangense YYQ-
30T (92.6%), Albimonas donghaensis DS2T (91.3%), Pontivivens
insulae GYSW-23T (91.3%), and Monaibacterium marinum
C7T (90.9%), belonging to the family Rhodobacteraceae.
The strain was aerobic, Gram-negative, rod-shaped, oxidasepositive,
and catalase-negative. Its optimum temperature,
pH, and salinity for growth were 25–30°C, pH 8.5, and 2–3%
NaCl (w/v), respectively. Its growth occurred at 15–35°C, pH
5.0–9.5, and 0–7% NaCl (w/v). It contained ubiquinone-10
(Q-10), a respiratory quinone, and the major cellular fatty
acids were 11-methyl C18:1 ω7c (31.9%), C18:1 ω6c (30.4%),
and C19:0 cyclo ω8c (16.1%). The polar lipids present in the
strain were phosphatidylglycerol, an unidentified phospholipid,
and an unidentified aminolipid. The strain had one
4,373,045 bp circular chromosome with G + C contents of
65.9 mol% including 4,169 genes, 4,118 coding sequences
(CDSs), 3 rRNAs, and 45 tRNAs. Genome annotation predicted
some gene clusters related to the degradation of several
types of organic matter such as protocatechuate, catechol,
and phthalate. Based on the polyphasic characteristics,
RR4-56T represents a novel genus and species in the family
Rhodobacteraceae, for which the name Pikeienuella piscinae
gen. nov., sp. nov. was proposed. The type strain is RR4-56T
(= KCTC 52648T = DSM 107918T).
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Citations
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Lin Lin, Jia Ning, Chunhui Li, Linlin Zhang, Yu Gao, Wang Bo, Ke Shi
Environmental Technology.2025; 46(5): 752. CrossRef -
Paludibacillus litoralis gen. nov., sp. nov.: a novel species of a novel genus in the family Paracoccaceae, isolated from the sediment of a tidal flat located in Zhoushan, China
Dong-yan He, Jia-wei Gao, Yu-ruo Wang, Ke Cao, Yun-fei Cao, Yang Li, Lu-yao Wang, Xing-cheng Wang, Lin Xu, Cong Sun
International Journal of Systematic and Evolutionary Microbiology
.2025;[Epub] CrossRef - Comparing the indigenous microorganism system in typical petroleum-contaminated groundwater
Jili Wang, Yuling Zhang, Yang Ding, Hewei Song, Ting Liu, Yi Zhang, Weiqing Xu, Yujia Shi
Chemosphere.2023; 311: 137173. CrossRef - Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, George Garrity
International Journal of Systematic and Evolutionary Microbiology
.2022;[Epub] CrossRef
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