- Volume 72, Issue 6, 2022
Volume 72, Issue 6, 2022
- New Taxa
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- Proteobacteria
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Aurantiacibacter sediminis sp. nov., a marine bacterium isolated from a tidal flat
A yellow-coloured bacterium, designated as strain JGD-13T, was isolated from a tidal flat in the Republic of Korea. Cells were Gram-stain-negative, aerobic, non-flagellated and rod-shaped. Growth was observed at 4–42 °C (optimum, 30 °C), at pH 6.0–12.0 (pH 7.0–8.0) and at 1–7 % (w/v) NaCl concentration (3 %). The 16S rRNA gene sequence analysis indicated that strain JGD-13T was closely related to Aurantiacibacter gangjinensis K7-2T with a sequence similarity of 98.2 %, followed by Aurantiacibacter aquimixticola JSSK-14T (98.1 %), Aurantiacibacter atlanticus s21-N3T (97.6 %), Aurantiacibacter zhengii V18T (97.6 %) and Aurantiacibacter luteus KA37T (97.5 %). The average nucleotide identity and digital DNA–DNA hybridization values with related strains were 70.3–76.2 % and 18.5–20.3 %. The genomic DNA G+C content was 60.2 mol%. Phylogenetic analysis using the maximum-likelihood method showed that strain JGD-13T formed a clade with A. aquimixticola JSSK-14T and A. gangjinensis K7-2T. The major fatty acids were summed feature 8 (39.7 %) and C17 : 1 ω6c (14.4 %). The predominant respiratory quinone was ubiquinone-10. The polar lipids were phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, one sphingoglycolipid and three unidentified lipids. On the basis of phylogenetic, phenotypic and chemotaxonomic characteristics, strain JGD-13T represents a novel species within the genus Aurantiacibacter , for which the name Aurantiacibacter sediminis JGD-13Tsp. nov. is proposed. The type strain is JGD-13T (=KCTC 72892T=KACC 21676T=JCM 33995T).
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Fourteen new Polynucleobacter species: P. brandtiae sp. nov., P. kasalickyi sp. nov., P. antarcticus sp. nov., P. arcticus sp. nov., P. tropicus sp. nov., P. bastaniensis sp. nov., P. corsicus sp. nov., P. finlandensis sp. nov., P. ibericus sp. nov., P. hallstattensis sp. nov., P. alcilacus sp. nov., P. nymphae sp. nov., P. paludilacus sp. nov. and P. parvulilacunae sp. nov.
More LessFourteen strains, all isolated from the surface of freshwater habitats, were genomically, phylogenetically and phenotypically characterized. The strains were obtained from geographically and climatically broadly scattered sites. This included two lakes in Antarctica, one arctic pond located on the Svalbard archipelago (Norway), a tropical habitat located in Uganda, some lakes in Southern Europe (Spain and France), lakes, ponds and a puddle in Central Europe (Austria, Czech Republic and Germany), and lakes in Northern Europe (Finland). Most of the investigated strains were characterized by rather small cell sizes and rather slow growth on media such as nutrient broth–soyotone–yeast extract (NSY) medium. Phylogenomic analyses indicated that all fourteen strains are affiliated with the genus Polynucleobacter ( Burkholderiaceae , Pseudomonadota ). Thirteen of the strains were found to be affiliated with subcluster PnecC of the genus. All these strains were characterized by genome sizes in the range of 1.7–2.3 Mbp and G+C values of 44.9–46.5 mol%. Furthermore, all PnecC-affiliated strains shared 16S rRNA gene sequence similarities >99 %. Only one strain characterized by a larger genome size of 2.9 Mbp and a lower G+C value of 41.0 mol% was found to be affiliated with subcluster PnecA. Whole genome sequence comparisons revealed that all 14 strains shared among each other, as well as with the type strains of the previously described 17 Polynucleobacter species, whole-genome average nucleotide identities values <95 %. This suggested that the 14 investigated strains represent 14 different new species. We propose the establishment of 14 new Polynucleobacter species represented by the following type strains: UB-Domo-W1T (=DSM 103491T=CIP 111598T=JCM 32562T), VK13T (=DSM 103488T=JCM 32564T), LimPoW16T (=DSM 24085T=CIP 111098T), UK-Long2-W17T (=DSM 103489T=CIP 111328T=JCM 32563T), UK-Pondora-W15T (=DSM 103423T=JCM 32939T), MWH-Mekk-B1T (=DSM 106779T=JCM 32556T), MWH-Mekk-C3T (=DSM 103415T=JCM 32557T), Ross1-W9T (=DSM 103416T=JCM 32561T), MWH-Hall10T (=DSM 107042T=JCM 32938T), AP-Basta-1000A-D1T (=DSM 107039T=JCM 32933T), AP-Melu-1000-A1T (=DSM 107036T=JCM 32935T), es-MAR-2T (=DSM 103424T=JCM 32554T), AP-Mumm-500A-B3T (=DSM 107037T=JCM 32936T), MWH-UH21BT (=DSM 23884T=LMG 29707T).
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Microvirga roseola sp. nov. and Microvirga lenta sp. nov., isolated from Taklamakan Desert soil
More LessTwo Gram-negative, rod-shaped, non-spore-forming bacteria, designated SM9T and SM2T, were isolated from Taklamakan Desert soil samples. Phylogenetic analysis based on the 16S rRNA gene sequences showed that strains SM9T and SM2T had the highest sequence similarity to the type strains Microvirga indica BCRC 80972T and Microvirga soli NBRC 112417T with similarity values of 98.2 and 97.7 %, respectively, and Microvirga was among the predominant genera in the desert soil. The draft genomes of these two strains were 4.56 Mbp (SM9T) and 5.08 Mbp (SM2T) long with 65.1 mol% (SM9T) and 63.5 mol% (SM2T) G+C content. To adapt to the desert environment, these two strains possessed pathways for the synthesis of stress metabolite trehalose. The major fatty acids (>5 %) included C18 : 1 ω9c in SM2T, but C16 : 0, C18 : 0 and C19 : 0 cyclo ω8c in SM9T, while the major menaquinone was ubiquinone 10 in both strains. The major polar lipids of SM9T and SM2T were phosphatidylglycerol, phosphatidylethanolamine and phospholipid. The average nucleotide identity and digital DNA–DNA hybridization results further indicated that strains SM9T and SM2T were distinguished from phylogenetically related species and represented two novel species within the genus Microvirga , for which the names Microvirga roseola sp. nov. (type strain SM2T=KCTC 72792T=CGMCC 1.17776T) and Microvirga lenta sp. nov. (type strain SM9T=KCTC 82729T=CCTCC AB 2021131T) are proposed.
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Chromobacterium alticapitis sp. nov. and Chromobacterium sinusclupearum sp. nov. isolated from wild cranberry bogs in the Cape Cod National Seashore, USA
More LessTwo non-pigmented strains in the genus Chromobacterium , MWU14-2602T and MWU13-2610T, were isolated from wild cranberry bogs in the Cape Cod National Seashore, USA. The isolates were characterized by genomic and phenotypic analyses, the results of which indicated that they represent two novel species. Based on total genome sequences, the closest relatives were in the Chromobacterium amazonense group, which includes the recently described Chromobacterium paludis . Whole genome sequences were compared by genome blast distance phylogeny, digital DNA–DNA hybridization and average nucleotide identity analyses with each other and with the type strains of their nearest species. MWU14-2602T and MWU13-2610T fell well below the accepted cutoff values for species relatedness, clearly indicating that they represent novel species. Although little is known about these organisms in situ, under laboratory conditions, MWU13-2610T produced a modest amount of HCN and was strongly positive for exoprotease activity, whereas MWU14-2602T did not produce HCN or exoproteases. The predominant fatty acids for both isolates were summed C16 : 1ω7cis/C16 : 1ω6cis. Both isolates produced siderophores and pyomelanin pigment on rich media, and neither was haemolytic on sheep blood agar. We propose the names Chromobacterium alticapitis sp. nov. (type strain MWU14-2602T=ATCC TSD 260T=CCOS 1979T) and Chromobacterium sinusclupearum sp. nov. (type strain MWU13-2610T=ATCC TSD-259T=CCOS 1981T) for these taxa.
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Methylophaga pinxianii sp. nov., isolated from the Mariana Trench
More LessTwo strains, TMB456T and TMB1265, were isolated from different locations in the Mariana Trench. Analysis of the 16S rRNA gene and genomic rRNA sequences indicated that they were from the same novel species and were affiliated with the genus Methylophaga of the class Gammaproteobacteria . Phylogenetic analysis based on 16S rRNA gene sequences indicated that the most closely related validly published species were Methylophaga muralis Kr3T (98.1 % similarity) and Methylophaga nitratireducenticrescens JAM1T (97.3 % similarity). Digital DNA–DNA hybridization values of TMB456T with M. muralis Kr3T and M. nitratireducenticrescens JAM1T were <25 %. The average nucleotide identity value between strain TMB456T and M. muralis Kr3T was 80.9 %. The genomic DNA G+C contents of strains TMB456T and TMB1265 were both 44.9 mol %. Strains TMB456T and TMB1265 could grow at 4–37 °C (optimum at 20–28 °C), at pH 3–10 (optimum at pH 7–9) and in the presence of 0–10 % (w/v) NaCl (optimum at 0–1 %). Cells of strains TMB456T and TMB1265 were Gram-negative rods (0.3–0.6 µm×0.7–1.3 µm). Chemotaxonomic analysis showed that ubiquinone 8 was the sole quinone produced by strain TMB456T and that the major cellular fatty acids were iso-C16 : 0, summed feature 3 (C16 : 1 ω7c and/or C16 : 1 ω6c) and summed feature 8 (C18 : 1 ω7c and/or C18 : 1 ω6c). The polar lipid profile of this strain included phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, phosphoglycolipids and two unidentified polar lipids. Based on the phenotypic, chemotaxonomic and molecular features, strains TMB456T and TMB1265 belong to a novel species within the genus Methylophaga , for which the name Methylophaga pinxianii sp. nov. is proposed. The type strain is TMB456T (=KCTC 82622T= MCCC 1K05898T).
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Xanthomonas bonasiae sp. nov. and Xanthomonas youngii sp. nov., isolated from crown gall tissues
The genus Xanthomonas contains a set of diverse bacterial strains, most of which are known for their pathogenicity on annual crops and fruit trees causing economically important plant diseases. Recently, five Xanthomonas strains were isolated from Agrobacterium -induced crown gall tissues of amaranth (Amaranthus sp.) and weeping fig (Ficus benjamina) plants in Iran. Phenotypic characteristics (i.e. biochemical tests and pathogenicity features) and whole genome sequence-based core-genome phylogeny followed by average nucleotide identity and digital DNA–DNA hybridization calculations suggested that these gall-associated strains belong to two new species within the genus Xanthomonas . In this study, we provide a formal species description for these new species where Xanthomonas bonasiae sp. nov. is proposed for the strains isolated from weeping fig with FX4T (=CFBP 8703T=DSM 112530T) as type strain. The name Xanthomonas youngii sp. nov. is proposed for the strains isolated from amaranth with AmX2T (=CFBP 8902T=DSM 112529T) as type strain.
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Rheinheimera maricola sp. nov., isolated from seawater of the Yellow Sea
More LessA Gram-negative and facultative aerobic strain, designated as strain MA-13T, was isolated from seawater in the Yellow Sea Republic of Korea. Cells were oxidase- and catalase-positive and non-motile short rods. Growth of strain MA-13T was observed over a range of 10–37 °C (optimum, 30 °C), pH 6.0–11.0 (optimum, pH 7.0) and in the presence of 0–5.5 % (w/v) sodium chloride (optimum, 1.0–2.0 %). Strain MA-13T contained ubiquinone-8 as the respiratory quinone, phosphatidylethanolamine, an unidentified aminolipid, an unidentified phospholipid and four unidentified lipids as major polar lipids and C16 : 0, C12 : 0 3-OH and summed feature 3 (C16 : 1 ω7c and/or C16 : 1 ω6c) as major cellular fatty acids. The G+C content of the genomic DNA was 48.3 mol%. Phylogenetic analyses based on the 16S rRNA gene and whole-genome sequences revealed that strain MA-13T formed a distinct phyletic lineage in the genus Rheinheimera . Strain MA-13T was most closely related to Rheinheimera lutimaris YQF-2T, Rheinheimera aquimaris SW-353T, Rheinheimera pacifica KMM 1406T and Rheinheimera baltica DSM 14885T with 98.10, 98.08, 98.07 and 97.94 % 16S rRNA gene sequence similarities. Average nucleotide identity and DNA–DNA hybridization values between strain MA-13T and R. aquimaris KCTC 12840T, R. pacifica DSM 17616T and R. baltica DSM 14885T were 76.3, 78.6 and 76.9 % and 19.5, 21.3 and 20.5 %, respectively. Based on the phenotypic, chemotaxonomic and molecular features, strain MA-13T represents a novel species of the genus Rheinheimera , for which the name Rheinheimera maricola sp. nov. is proposed. The type strain is MA-13T (=KACC 22113T=JCM 34600T).
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Pseudomonas petroselini sp. nov., a pathogen causing bacterial rot of parsley in Japan
More LessPhytopathogenic bacterial strains (MAFF 311094T, MAFF 311095, MAFF 311096 and MAFF 311097), which were isolated from rot lesions of parsley (Petroselinum crispum) sampled in Miyagi, Japan, were subjected to polyphasic characterization to determine their taxonomic position. The cells were Gram-reaction-negative, aerobic, non-spore-forming, motile with one or two polar flagella and rod-shaped. The 16S rRNA gene sequences analyses revealed that the strains belong to the genus Pseudomonas , exhibiting the highest sequence similarity to Pseudomonas sivasensis P7T (99.93% sequence similarity), Pseudomonas cyclaminis MAFF 301449T (99.93 %), Pseudomonas extremaustralis 14-3T (99.86 %), Pseudomonas kitaguniensis MAFF 212408T (99.86 %) and Pseudomonas antarctica CMS 35T (99.79 %). The genomic DNA G+C content was 60.1 mol%, and the major cellular fatty acids (>5 % of the total fatty acids) were C16:0, summed feature 3 (C16:1 ω7c/C16:1 ω6c), summed feature 8 (C18:1 ω7c/C18:1 ω6c) and C17:0 cyclo. The rpoD sequence-based phylogenetic and whole genome-based phylogenomic analyses demonstrated that the strains are a member of the Pseudomonas fluorescens subgroup, but their phylogenetic position does not match those of any members of this subgroup. The average nucleotide identity and digital DNA–DNA hybridization values between the strains and their closely related species were ≤90.64% and ≤41.9 %, respectively, which were below the thresholds for prokaryotic species delineation (95–96 and 70%, respectively). Phenotypic characteristics, pathogenicity toward parsley and cellular fatty acid composition could differentiate the strains from their closest relatives. The phenotypic, chemotaxonomic and genotypic data presented in this study revealed that the strains constitute a novel Pseudomonas species, for which we propose the name Pseudomonas petroselini sp. nov., with MAFF 311094T (=ICMP 24279T) being the type strain.
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Neokomagataea anthophila sp. nov., an osmotolerant acetic acid bacterium isolated in Thailand and emended description of the genus Neokomagataea
A novel Gram-stain-negative, rod-shaped, non-motile, aerobic bacterium isolated from a sea bean flower [Canavalia rosea (Sw.) DC.] collected in Surat Thani Province, Thailand, and designated as AH18T was characterized on the basis of polyphasic taxonomy. The phylogenetic analysis of 16S rRNA gene revealed that strain AH18T represented a member of the genus Neokomagataea . In the 16S rRNA gene sequence analysis, the strain's closest phylogenetic neighbour was Neokomagataea thailandica TBRC 376T. The draft genome size of strain AH18T was 2613495 bp, and its DNA G+C content was 52.0 mol%. The strain showed 90.3 and 76.3% pairwise-determined whole-genome average nucleotide identity and 39.8 and 19.6% digital DNA–DNA hybridization values with N. thailandica TBRC 376T and N. tanensis TBRC 7768T, respectively. The 16S rRNA gene sequences and phylogenomic analysis revealed that the strain clustered with the members of the genus Neokomagataea but was located in a distinct branch closely related to N. thailandica TBRC 376T. The predominant cellular fatty acids of the strain were summed feature 8 (C18:1 ω6c and/or C18:1 ω7c), C16:0 and C18:1 2OH (>5%). The major respiratory ubiquinone was Q-10. In addition, strain AH18T was substantiated by differences in several physiological characteristics and by MALDI-TOF profiling. On the basis of the results obtained from phenotypic, chemotaxonomic, phylogenetic and genomic analyses, the strain clearly represented a novel species within the genus Neokomagataea , for which the name Neokomagataea anthophila sp. nov. (AH18T=TBRC 2177T=NBRC 115156T) is proposed. An emended description of the genus Neokomagataea is also given.
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Symbiopectobacterium purcellii, gen. nov., sp. nov., isolated from the leafhopper Empoasca decipiens
More LessBacterial endosymbionts are found in multiple arthropod species, where they play crucial roles as nutritional symbionts, defensive symbionts or reproductive parasites. Recent work has highlighted a new clade of heritable microbes within the gammaproteobacteria that enter into both obligate and facultative symbioses, with an obligately required unculturable symbiont recently given the name Candidatus Symbiopectobacterium. In this study, we describe a culturable rod shaped non-flagellated bacterial symbiont from this clade isolated from the leafhopper Empoasca decipiens. The symbiont is related to the transovarially transmitted ‘BEV’ bacterium that was first isolated from the leafhopper Euscelidius variegatus by Alexander Purcell, and we therefore name the symbiont Symbiopectobacterium purcellii sp. nov., gen. nov. We further report the closed genome sequence for S. purcellii. The genome is atypical for a heritable microbe, being large in size, without profound AT bias and with little evidence of pseudogenization. The genome is predicted to encode Type II, III and VI secretion systems and associated effectors and a non-ribosomal peptide synthase array likely to produce bioactive small molecules. The predicted metabolism is more complete than for other symbionts in the Symbiopectobacterium clade, and the microbe is predicted to synthesize a range of B vitamins. However, Biolog plate results indicate that the metabolism is depauperate compared to the sister clade, represented by Pectobacterium carotovorum . A quorum-sensing pathway related to that of Pectobacterium species (containing an overlapping expI-expR1 pair in opposite directions and a “solo” expR2) is evidenced, and LC-MS/MS analysis reveals the presence of 3-hydroxy-C10-HSL as the sole N-acylhomoserine lactone (AHL) in our strain. This AHL profile is profoundly divergent from that of other Erwinia and Pectobacterium species which produce mostly 3-oxo-C6- and 3-oxo-C8-HSL and could aid group identification. Thus, this microbe denotes one that has lost certain pathways associated with a saprophytic lifestyle but represents an important baseline against which to compare other members of the genus Symbiopectobacterium that show more profound integration into host biology. The type strain of Symbiopectobacterium purcellii gen. nov., sp. nov. is SyEd1T (LMG 32449T=CECT 30436T).
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Thermomonas flagellata sp. nov. and Thermomonas alba sp. nov., two novel members of the phylum Pseudomonadota isolated from hot spring sediments
Two novel species, designated strains SYSU G04041T and SYSU G04536T, were isolated from hot spring sediments collected in Yunnan, PR China. Phenotypic and chemotaxonomic analyses, and whole-genome sequencing were used to determine the taxonomic positions of the candidate strains. Phylogenetic analysis using 16S rRNA gene sequence indicated that strain SYSU G04041T showed the highest sequence similarity to Thermomonas haemolytica A50-7-3T (97.5 %), and SYSU G04536T showed the highest sequence similarity to Thermomonas hydrothermalis SGM-6T (98.2 %). The strains could be differentiated from other species of the genus Thermomonas by their distinct phenotypic and genotypic characteristics. Cells of strains SYSU G04041T and SYSU G04536T were aerobic, motile and Gram-stain-negative. Growth both occurred optimally at 45 °C and pH 7.0 for SYSU G04041T and SYSU G04536T. In addition, the predominant respiratory quinone in both isolates was ubiquinone Q-8. The major fatty acids (>10 %) of strain SYSU G04041T were C16 : 0, iso-C15 : 0 and iso-C16 : 0, while the major fatty acids (>10 %) of strain SYSU G04536T were iso-C15 : 0 and iso-C16 : 0. The main detected polar lipids in strains SYSU G04041T and SYSU G04536T included phosphatidylethanolamine, diphosphatidylglycerol and phosphatidylglycerol. The G+C contents of the genomic DNA of strains SYSU G04041T and SYSU G04536T based on draft genomic sequences were 72.5 and 68.3 %, respectively. On the basis of phenotypic, genotypic and phylogenetic data, strains SYSU G04041T and SYSU G04536T represent two novel species of the genus Thermomonas , for which the names Thermomonas flagellata sp. nov. and Thermomonas alba sp. nov. are proposed, with the type strains SYSU G04041T (=CGMCC 1.19366T=KCTC 92228T) and SYSU G04536T (=CGMCC 1.19367T=KCTC 82839T), respectively.
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- Eukaryotic Micro-Organisms
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Magnusiomyces siamensis sp. nov., a yeast-like fungus isolated from food waste
More LessThree yeast strains, DMKU-GTSP8-6, DMKU-GTSP8-14T and DMKU-JED8-73, were isolated from food waste in Thailand. Based on the phenotypic characteristics and sequence analysis of the D1/D2 domain of the large subunit (LSU) rRNA gene and the internal transcribed spacer (ITS) region, it was revealed that the three strains clustered with the Magnusiomyces/Saprochaete clade. These strains were distinguished from the closely related species Saprochaete quercus CBS 750.85, Magnusiomyces ovetensis CBS 192.55T, Magnusiomyces starmeri CBS 780.96T, Saprochaete chiloensis CBS 8187T and Magnusiomyces ingens CBS 517.90T by 11.4, 13.1, 11.9, 11.2 and 12.6 % sequence divergence in the D1/D2 domain and by 34.6, 34.5, 33.6, 33.2 and 34.9 % sequence divergence in the ITS region, respectively. The new species, which does not produce ascospores, is described as Magnusiomyces siamensis. The holotype of Magnusiomyces siamensis is TBRC 15056T, and the isotypes are DMKU-GTSP8-14T and PYCC 9023T.
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- ICSP Matters
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International Committee on Systematics of Prokaryotes, Subcommittee on the taxonomy of Rhizobia and Agrobacteria, minutes of the annual meeting by videoconference, 5 July 2021, followed by online discussion until 31 December 2021
More LessMinutes of the closed meeting of the International Committee on Systematics of Prokaryotes Subcommittee on the Taxonomy of Rhizobia and Agrobacteria held by videoconference, 5 July 2021, followed by online discussion until 31 December 2021, and list of recent species.
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- Corrigenda
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Volumes and issues
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