- Volume 58, Issue 12, 2008
Volume 58, Issue 12, 2008
- New Taxa
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- Other Bacteria
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Rubidibacter lacunae gen. nov., sp. nov., a unicellular, phycoerythrin-containing cyanobacterium isolated from seawater of Chuuk lagoon, Micronesia
More LessA unicellular cyanobacterium, designated KORDI 51-2T, was isolated from surface seawater of Chuuk lagoon, Micronesia. The cells were wine-coloured rods and emitted red fluorescence under green excitation of an epifluorescence microscope. Thus, morphologically, the strain resembled Synechococcus species. However, based on 16S rRNA gene sequence similarities between strain KORDI 51-2T and related strains belonging to cyanobacteria, the novel strain was distantly related to members of the ‘Halothece’ cluster. However, sequence similarities between strain KORDI 51-2T and members of the ‘Halothece’ cluster were very low, ranging from 90.7 to 92.1 %, and phylogenetic analyses showed that the strain formed a distinct branch. Therefore, a polyphasic characterization including morphology, physiology and pigment composition was conducted to elucidate the taxonomic position of strain KORDI 51-2T. The strain grew within a temperature range of 25–35 °C and a salinity range of 2–7 %. The optimal temperature and salinity were about 30 °C and 5 %, respectively. Strain KORDI 51-2T contained phycoerythrin, and the dominant carotenoid pigments were zeaxanthin, β-carotene and echinenone. The DNA G+C content was 60.5 mol%. Based on phylogenetic analysis of the 16S rRNA gene sequence, and the physiological data and pigment compositions, strain KORDI 51-2T is considered to represent a new genus and novel species of cyanobacteria for which the name Rubidibacter lacunae gen. nov., sp. nov. is proposed. The type strain is KORDI 51-2T (=KCTC 40015T=UTEX L2944T).
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Megamonas rupellensis sp. nov., an anaerobe isolated from the caecum of a duck
More LessWe report here the identification, characterization and culture of a Gram-negative to Gram-variable, rod-shaped, non-spore-forming anaerobic bacterium (strain FM1025T) isolated from the caecum of a duck. Phylogenetic analysis based on comparative 16S rRNA gene sequencing showed that this strain clustered with species of the family ‘Acidaminococcaceae’, with 94.9 % similarity to Megamonas hypermegale DSM 1672T and less than 91 % similarity with type strains of Pectinatus species. Sequence similarities of at least 98–99 % were observed with numerous sequences deposited in GenBank of uncultured strains from human and chicken caecal contents, but this strain is the first isolate of this taxon to be cultivated and described. On the basis of morphological, physiological and phylogenetic features, this strain should be assigned to a novel species in the genus Megamonas, for which the name Megamonas rupellensis sp. nov. is proposed. The type strain is strain FM1025T (=DSM 19944T =CIP 109788T).
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- Proteobacteria
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Vogesella perlucida sp. nov., a non-pigmented bacterium isolated from spring water
More LessA transparent, non-pigmented, Gram-negative, rod-shaped bacterium, designated strain DS-28T, was isolated from water samples collected from a spring located in Tainan County, Taiwan. 16S rRNA gene sequence analysis indicated that the novel strain formed a monophyletic branch at the periphery of the evolutionary radiation occupied by the genus Vogesella; the only sole close neighbour of the novel strain was Vogesella indigofera ATCC 19706T (97.4 % 16S rRNA gene sequence similarity). The isolate was distinguished from V. indigofera on the basis of genotypic data, several phenotypic properties and an inability to produce characteristic blue-pigmented colonies on peptone agar. The fatty acid profile was slightly different from that reported for V. indigofera ATCC 19706T. It was evident from the genotypic and phenotypic data that strain DS-28T represents a novel species of the genus Vogesella, for which the name Vogesella perlucida sp. nov. is proposed. The type strain is DS-28T (=BCRC 17730T=LMG 24214T).
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Amorphus coralli gen. nov., sp. nov., a marine bacterium isolated from coral mucus, belonging to the order Rhizobiales
More LessA bacterial strain, designated RS.Sph.026T, was isolated from mucus of the coral Fungia granulosa collected from the northern Red Sea (Gulf of Eilat, Israel). The bacterium was found to be Gram-negative, non-motile, halotolerant and heterotrophic. Comparative 16S rRNA gene sequence analyses showed that strain RS.Sph.026T belonged to the order Rhizobiales, with the highest levels of 16S RNA gene sequence similarity with Rhodobium orientis (92 %). Strain RS.Sph.026T grew optimally at a salinity of 3–4 %, pH 7.5–8 and 25–30 °C. The major cellular fatty acids were cis-7-octadecenoic acid (C18 : 1 ω7с; 57.2 %) and C19 : 0 cyclo ω8с (15.5 %). The DNA G+C content of strain RS.Sph.026T was 67.1 mol%. On the basis of its phenotypic properties and phylogenetic distinctiveness, strain RS.Sph.026T represents a novel genus and species in the order Rhizobiales, for which the name Amorphus coralli gen. nov., sp. nov. is proposed. The type strain is RS.Sph.026T (=LMG 24307T=DSM 19760T).
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Ruegeria scottomollicae sp. nov., isolated from a marine electroactive biofilm
Seventy isolates were obtained from a marine electroactive biofilm that was generated on a cathodically polarized stainless steel electrode (Genoa, Italy). The genetic diversity was investigated by means of BOX-PCR fingerprinting and two clusters of isolates with similar BOX-PCR profiles were delineated. Whole-cell fatty acid methyl ester analysis and 16S rRNA gene sequence analysis showed that the isolates belonged to the Roseobacter lineage of the class Alphaproteobacteria. DNA–DNA hybridization experiments and a biochemical analysis demonstrated that four isolates belonged to the species Ruegeria mobilis. However, 66 isolates from the second BOX-PCR cluster constituted a novel species within the genus Ruegeria, for which the name Ruegeria scottomollicae sp. nov. is proposed. The DNA G+C content was 61.0±0.4 %. The type strain is LMG 24367T (=CCUG 55858T).
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Marinomonas basaltis sp. nov., a marine bacterium isolated from black sand
A Gram-negative, aerobic, slightly halophilic, rod-shaped bacterium was isolated from black sand in Soesoggak, Jeju island, Korea. The strain, designated J63T, was oxidase- and catalase-positive and arginine dihydrolase-negative. The isolate required Na+ for growth and differed from phenotypically related species by being able to utilize sucrose and d-galactose as a carbon source. Phylogenetic analysis based on the sequence of the 16S rRNA gene revealed that strain J63T belongs to the genus Marinomonas. It exhibited 16S rRNA gene sequence similarities of 97.6–98.7 % to the closely related species Marinomonas communis, Marinomonas ostreistagni, Marinomonas aquimarina and Marinomonas vaga. The phylogenetic analysis revealed that strain J63T comprised a relatively long subline of descent, shared a branch point with the outlying species Marinomonas communis and occupied a phylogenetically distant position on the main Marinomonas branch. Based on DNA–DNA hybridization, the levels of relatedness between strain J63T and M. communis NBRC 102224T, M. aquimarina CIP 108405T and M. vaga JCM 20774T were 56.2, 45.1 and 51.3 %, respectively. On the basis of the phenotypic, genetic and phylogenetic data, strain J63T should be placed in the genus Marinomonas as representing a novel species, for which the name Marinomonas basaltis sp. nov. is proposed. The type strain is J63T (=KCTC 22118T=JCM 14948T).
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Leisingera aquimarina sp. nov., isolated from a marine electroactive biofilm, and emended descriptions of Leisingera methylohalidivorans Schaefer et al. 2002, Phaeobacter daeponensis Yoon et al. 2007 and Phaeobacter inhibens Martens et al. 2006
More LessStrain LMG 24366T was isolated from a marine electroactive biofilm grown on a stainless steel cathode (Genova, Italy) and was investigated by using a polyphasic taxonomic approach. This study demonstrated that strain LMG 24366T represents a novel species within the genus Leisingera, which shared 98.9 % 16S rRNA gene similarity with its nearest phylogenetic neighbour, Leisingera methylohalidivorans. Strain LMG 24366T grew on betaine (1 mM) as a sole carbon source, whereas no growth was observed on l-methionine (10 mM). The phenotypic and genotypic analyses showed that strain LMG 24366T could be differentiated from established Leisingera species and that it represented a novel species, for which the name Leisingera aquimarina sp. nov. is proposed. The type strain is LMG 24366T (=CCUG 55860T) and has a DNA G+C content of 61.4 mol%.
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Characterization of ‘Candidatus Neoehrlichia lotoris’ (family Anaplasmataceae) from raccoons (Procyon lotor)
Recently, a novel ehrlichial organism was isolated from a raccoon (Procyon lotor) and the isolate (RAC413) was infectious to two naïve raccoons but not laboratory mice, rats or rabbits. In this study, amplification and sequencing of four gene targets (16S rRNA gene, groESL, gltA and rpoB) confirmed that the novel ehrlichial organism was a member of the family Anaplasmataceae and was most closely related to, but distinct from, ‘Candidatus Neoehrlichia mikurensis’ TK4456R and IS58. RAC413 shared the highest sequence similarity with members of the genus Ehrlichia (94.2–95.1, 80.9–83.1, 67.9–71.9 and 39.9–40.7 % similarity for the 16S rRNA gene, groESL, gltA and rpoB, respectively). No sequence variation in three sequences (16S rRNA gene, groESL and gltA) was observed between the RAC413 isolate and five additional sequences amplified from blood of naturally infected raccoons from several geographically isolated populations in the south-eastern USA. Serum samples from four experimentally infected raccoons did not react to Ehrlichia canis, Ehrlichia chaffeensis, Anaplasma marginale or Anaplasma phagocytophilum antigens in an immunofluorescence assay or an Ehrlichia ewingii peptide in an ELISA format. On the basis of the distinctive molecular and serological characteristics and apparent host specificity of this ehrlichial organism, it is proposed that this organism be designated ‘Candidatus Neoehrlichia lotoris’ (reference strain RAC413R).
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Amphritea japonica sp. nov. and Amphritea balenae sp. nov., isolated from the sediment adjacent to sperm whale carcasses off Kagoshima, Japan
Two novel species were isolated from the sediment adjacent to sperm whale carcasses off Kagoshima, Japan, at a depth of about 230 m. The isolated strains, JAMM 1866T, JAMM 1548 and JAMM 1525T, were Gram-negative, rod-shaped, non-spore-forming and motile by means of a single polar or bipolar flagellum. Phylogenetic analysis based on 16S rRNA gene sequences of strains JAMM 1866T and JAMM 1548 indicated a relationship to the symbiotic bacterial clone R21 of Osedax japonicus (100 % sequence similarity) and all three isolates were closely related to Amphritea atlantica (97.7–97.8 % similarity) within the class Gammaproteobacteria. The novel isolates were able to produce isoprenoid quinone Q-8 as the major component. The predominant fatty acids were C16 : 0, C16 : 1 and C18 : 1, with C12 : 1 3-OH present in smaller amounts. The DNA G+C contents of the three isolated strains were about 47 mol%. Based on differences in taxonomic characteristics, the three isolated strains represent two novel species of the genus Amphritea for which the names Amphritea japonica sp. nov. (type strain JAMM 1866T=JCM 14782T=ATCC BAA-1530T; reference strain JAMM 1548) and Amphritea balenae sp. nov. (type strain JAMM 1525T=JCM 14781T=ATCC BAA-1529T) are proposed.
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Halomonas salifodinae sp. nov., a halophilic bacterium isolated from a salt mine in China
More LessA Gram-negative, aerobic, motile, halophilic bacterium, designated strain BC7T, was isolated from a salt mine in north-western China and was subjected to a polyphasic taxonomic characterization. The isolate was able to grow in the presence of 0.5–20 % (w/v) NaCl and at pH 6.0–9.0 and 4–48 °C; optimum growth was observed with 3 % (w/v) NaCl and at pH 7.0 and 30 °C. Cells were long rods, 0.8–1.2 μm wide and 4.0–6.0 μm long. The major fatty acids were C18 : 1 ω7c, C16 : 0 and C16 : 0 ω7c. The DNA G+C content was 65.5 mol%. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain BC7T belonged to the genus Halomonas and showed highest sequence similarity to the type strain of Halomonas pacifica (99.2 %). Levels of DNA–DNA relatedness between strain BC7T and H. pacifica CGMCC 1.2314T and Halomonas taeanensis DSM 16463T were 51 and 38 %, respectively. On the basis of phenotypic and genotypic data, strain BC7T is considered to represent a novel species of the genus Halomonas, for which the name Halomonas salifodinae sp. nov. is proposed. The type strain is BC7T (=CGMCC 1.6774T =JCM 14803T).
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Halomonas daqingensis sp. nov., a moderately halophilic bacterium isolated from an oilfield soil
A Gram-negative, moderately halophilic, short rod-shaped, aerobic bacterium with peritrichous flagellae, strain DQD2-30T, was isolated from a soil sample contaminated with crude oil from the Daqing oilfield in Heilongjiang Province, north-eastern China. The novel strain was capable of growth at NaCl concentrations of 1–15 % (w/v) [optimum at 5–10 % (w/v)]. Phylogenetic analyses based on 16S rRNA gene sequences showed that the novel strain belonged to the genus Halomonas in the class Gammaproteobacteria; the highest 16S rRNA gene sequence similarities were with Halomonas desiderata DSM 9502T (98.8 %), Halomonas campisalis A4T (96.6 %) and Halomonas gudaonensis CGMCC 1.6133T (95.1 %). The major cellular fatty acids of strain DQD2-30T were C18 : 1 ω7c (43.97 %), C19 : 0 cyclo ω8c (23.37 %) and C16 : 0 (14.83 %). The predominant respiratory lipoquinone was ubiquinone with nine isoprene units (Q9). The DNA G+C content was 67.0 mol%. The DNA–DNA hybridization values of strain DQD2-30T with the most closely related species of the genus Halomonas were 51.8 %, 28.4 % and 23.5 % for H. desiderata, H. campisalis and H. gudaonensis, respectively. Based on these analyses, strain DQD2-30T (=CGMCC 1.6443T=LMG 23896T) is proposed to represent the type strain of a novel species, Halomonas daqingensis sp. nov.
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Marinobacter goseongensis sp. nov., from seawater
A Gram-negative marine bacterium, designated strain En6T, was isolated from seawater of the East Sea of Korea. The organism grew in 1–25 % (w/v) NaCl and at 10–37 °C and pH 5.3–9.3, with optimal growth occurring in 4–5 % NaCl and at 25–30 °C and pH 7.5. Phylogenetic analysis of the 16S rRNA gene sequence of strain En6T placed this bacterium in the clade Marinobacter within the class Gammaproteobacteria. The 16S rRNA gene sequence similarity between strain En6T and Marinobacter lipolyticus SM19T, the most closely related species, was 98.4 %, and the level of DNA–DNA relatedness between the two strains was 22 %. On the basis of the phylogenetic analysis and phenotypic and chemotaxonomic data, strain En6T is considered to represent a novel species of the genus Marinobacter. The name Marinobacter goseongensis sp. nov. is proposed, with strain En6T (=KCTC 12515T=DSM 19471T) as the type strain.
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Rhizobium fabae sp. nov., a bacterium that nodulates Vicia faba
Six strains were isolated from root nodules of Vicia faba grown in Nanchang, Yifeng, Taihu, Huaibei, Bengbu and Lujiang, in the middle and lower reaches of the Yangtze River. According to phylogenetic analyses of 16S rRNA gene, atpD and recA sequences, these strains belong to the genus Rhizobium, with Rhizobium etli and Rhizobium leguminosarum as the closest related species. CCBAU 33202T, a representative of these novel isolates, showed sequence similarity to its closest relatives R. etli CFN 42T and R. leguminosarum USDA 2370T of 99.5 and 99.1 % for the 16S rRNA gene, 91.9 and 91.9 % for atpD and 90.3 and 93.2 % for recA. The strains from this study could also be differentiated from R. etli CFN 42T and R. leguminosarum USDA 2370T by 16S–IGS RFLP and SDS-PAGE of whole-cell proteins, fatty acid profiles and several phenotypic characteristics. DNA–DNA hybridization yielded relatedness of 19 and 14–43 %, respectively, with R. etli CFN 42T and strains representing different biovars of R. leguminosarum. All data obtained in this study showed that these V. faba isolates belong to a novel species, for which the name Rhizobium fabae sp. nov. is proposed. The type strain, CCBAU 33202T (=LMG 23997T =JCM 14381T), was isolated from Nanchang.
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Marinobacter mobilis sp. nov. and Marinobacter zhejiangensis sp. nov., halophilic bacteria isolated from the East China Sea
More LessThree Gram-negative, aerobic, motile, halophilic, rod-shaped strains (CN46T, CN71 and CN74T) were isolated from sediment of the East China Sea and subjected to a polyphasic taxonomic study. Strains CN46T and CN71 had identical 16S rRNA gene sequences and phenotypic characteristics. Strain CN46T was moderately halophilic. Growth of strain CN46T was observed between 0.5 and 10.0 % (w/v) NaCl (optimal growth at 3.0–5.0 %) and between pH 6.5 and 9.0. Strain CN74T grew over a wider range of pH (pH 6.0–9.5); the optimum NaCl concentration for growth was 1.0–3.0 %. The major fatty acids of strain CN46T were C16 : 1 ω9c, C16 : 0 and C12 : 0, whereas strain CN74T contained C16 : 0, C16 : 1 ω9c, C18 : 1 ω9c and C12 : 0. The DNA G+C contents of the three isolates were between 58.0 and 58.9 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed that strains CN46T, CN71 and CN74T grouped together within the cluster of Marinobacter species. 16S rRNA gene sequence similarities of the three strains with the type strains of Marinobacter species ranged from 94.0 to 97.1 %. The DNA–DNA hybridization values of strain CN74T with strains CN46T and CN71 were 35.0 and 36.0 %, respectively. Levels of DNA–DNA relatedness between strains CN46T and CN74T and Marinobacter pelagius CGMCC 1.6775T, Marinobacter gudaonensis CGMCC 1.6294T and Marinobacter koreensis DSM 17924T were 15.3–45.2 %. The results of DNA–DNA hybridizations, fatty acid analysis, and physiological and biochemical tests allowed genotypic and phenotypic differentiation of the isolates from closely related species. Two novel species are proposed, named Marinobacter mobilis sp. nov. (type strain CN46T =CGMCC 1.7059T =JCM 15154T) and Marinobacter zhejiangensis sp. nov. (type strain CN74T =CGMCC 1.7061T =JCM 15156T).
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Thiohalorhabdus denitrificans gen. nov., sp. nov., an extremely halophilic, sulfur-oxidizing, deep-lineage gammaproteobacterium from hypersaline habitats
More LessSeven strains of extremely halophilic and obligately chemolithoautotrophic sulfur-oxidizing bacteria (SOB) were enriched and isolated at 4 M NaCl from sediments of hypersaline inland lakes in south-eastern Siberia and a Mediterranean sea solar saltern. Cells of the novel isolates were spindle-like, long and non-motile rods with a Gram-negative type of cell wall. They were obligately chemolithoautotrophic SOB using thiosulfate and tetrathionate as electron donors and represent the first example of extremely halophilic chemolithoautotrophs that are able to grow anaerobically with nitrate as electron acceptor. The characteristic feature of the group was the production of large amounts of tetrathionate as an intermediate during the oxidation of thiosulfate to sulfate. With thiosulfate, the novel strains grew within the pH range from 6.5 to 8.2 (optimum at pH 7.5–7.8) and at NaCl concentrations from 1.5 to 4.0 M (optimum at 3.0 M). Cells grown at 4 M NaCl accumulated extremely high concentrations of glycine betaine as a compatible solute. The dominant cellular fatty acids were 10MeC16 : 0 and C16 : 0. Based on the DNA–DNA relatedness values, the isolates consisted of a single genomic species and had a similar phenotype. Phylogenetic analysis placed the novel bacteria in the class Gammaproteobacteria as an independent lineage with no significant relationship to any other genera in this class. On the basis of phenotypic and genotypic analysis, the group is proposed to represent a new genus, Thiohalorhabdus gen. nov., with Thiohalorhabdus denitrificans gen. nov., sp. nov. as the type species (type strain HL 19T=DSM 15699T=UNIQEM U223T).
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Luteimonas marina sp. nov., isolated from seawater
More LessA marine bacterial strain, designated FR1330T, was isolated from a seawater sample collected near Ganghwa Island, the Republic of Korea. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain FR1330T belonged to the Gammaproteobacteria and was related to the genus Luteimonas; its closest neighbours were the type strains of Luteimonas composti (97.9 % sequence similarity) and Luteimonas mephitis (95.0 %). DNA–DNA relatedness values for strain FR1330T with Luteimonas composti CC-YY255T and Luteimonas mephitis KACC 11391T were 33 and 10 %, respectively. Cells of strain FR1330T were Gram-negative, aerobic, rod-shaped and oxidase- and catalase-positive. The predominant respiratory lipoquinone was ubiquinone-8. The major fatty acids were branched-chain saturated iso-C15 : 0 (26.2 %) and unsaturated iso-C17 : 1 ω9c (26.0 %). The DNA G+C content was 67.6 mol%. On the basis of several phenotypic characteristics, strain FR1330T could be differentiated from Luteimonas composti and Luteimonas mephitis. The data obtained from the polyphasic study demonstrated clearly that strain FR1330T represents a novel species of the genus Luteimonas. The name Luteimonas marina sp. nov. is proposed, with strain FR1330T (=KCTC 12327T=JCM 12488T=IMSNU 60306T) as the type strain.
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Rhodospirillum sulfurexigens sp. nov., a phototrophic alphaproteobacterium requiring a reduced sulfur source for growth
More LessA Gram-negative, spiral-shaped, phototrophic, purple non-sulfur bacterial strain, JA143T, was isolated from a freshwater habitat. Strain JA143T was motile by means of bipolar tufts of flagella. Intracellular photosynthetic membranes are of the lamellar stacked type. Bacteriochlorophyll a and carotenoids of the spirilloxanthin series with rhodovibrin are present as photosynthetic pigments. Thiamine and a reduced sulfur source are required for growth. Phylogenetic analysis on the basis of 16S rRNA gene sequences showed that strain JA143T clusters with species of the genus Rhodospirillum, belonging to the class Alphaproteobacteria. The highest sequence similarities of strain JA143T were found with the type strains of Rhodospirillum rubrum (95.6 %) and Rhodospirillum photometricum (95.7 %). Based on 16S rRNA gene sequence analysis and morphological and physiological characteristics, strain JA143T was significantly different from the other two recognized species of the genus Rhodospirillum and represents a novel species, for which the name Rhodospirillum sulfurexigens sp. nov. is proposed. The type strain is JA143T (=DSM 19785T =NBRC 104433T).
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- Eukaryotic Micro-Organisms
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Metschnikowia cubensis sp. nov., a yeast species isolated from flowers in Cuba
More LessA novel yeast species is described from 19 strains isolated from flowers and insects in three provinces of Cuba. The species is so far known only from Cuba. Characteristic asci and ascospores as well as phylogenetic analysis of the rDNA sequence place the novel species in the genus Metschnikowia. The novel species belongs to the New World subclade of large-spored species of Metschnikowia. Mating tests with other members of the subclade resulted in the formation of sterile asci without ascospores, showing that the Cuban strains represent a distinct biological species. Intraspecies matings lead to the production of fertile asci containing large needle-shaped ascospores. The novel species was further distinguished from its close relatives by rDNA sequences and PCR fingerprinting using primers derived from mini- and microsatellites. We propose the name Metschnikowia cubensis sp. nov. and designate MUCL 45753T (=CRGF 279T =CBS 10832T, h+) as the type strain and MUCL 45751 (=CRGF 278 =CBS 10833, h−) as the allotype.
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Cryptococcus keelungensis sp. nov., an anamorphic basidiomycetous yeast isolated from the sea-surface microlayer of the north-east coast of Taiwan
More LessStrain SN-82T was isolated from the sea-surface microlayer at Keelung on the north-east coast of Taiwan. Sequence analysis of the D1/D2 domain of the 26S rDNA of strain SN-82T suggested that this strain is related to the aerius clade in the Filobasidiales. Phenotypic characteristics such as the absence of sexual structures and ballistoconidia, the assimilation of myo-inositol and d-glucuronate, the inability to ferment glucose, the possession of coenzyme Q-10 and positive Diazonium blue B and urease reactions also indicated that this strain belongs to the genus Cryptococcus. However, divergences of more than 3.6 % were observed in the D1/D2 domain when compared with other described Cryptococcus species, which indicated that the isolated yeast represents a previously unrecognized member of this genus. Therefore, the novel yeast species Cryptococcus keelungensis sp. nov. is proposed, with strain SN-82T (=CBS 10876T =BCRC 23107T =JCM 14893T) as the type strain.
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Mrakiella cryoconiti gen. nov., sp. nov., a psychrophilic, anamorphic, basidiomycetous yeast from alpine and arctic habitats
More LessA novel psychrophilic basidiomycetous species is described in a new anamorphic genus as Mrakiella cryoconiti gen. nov., sp. nov.; the type strain of Mrakiella cryoconiti is strain A15T (=CBS 10834T =DSM 21094T). Two representatives were isolated from alpine glacier cryoconite and from northern Siberian sediment. Physiological and biochemical properties are similar to characteristics shared by members of the genus Mrakia, although sexual reproduction is absent. Mrakiella cryoconiti strains are psychrophilic and produce cold-active pectate lyase. Sequence analyses of the ITS and 26S rRNA D1/D2 regions indicated that these strains represent a distinct taxon within the Mrakia clade of the order Cystofilobasidiales, class Tremellomycetes and phylum Basidiomycota. On the basis of phenotypic and genotypic characteristics, Cryptococcus aquaticus (a member of the Mrakia clade) is transferred to the newly described genus as Mrakiella aquatica comb. nov.
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