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Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Republic of Korea
Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr
| ABSTRACT |
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7c and/or iso-C15 : 0 2-OH. The DNA G+C content of each of the two strains was 42 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed that the two strains fall within the evolutionary radiation enclosed by the genus Algoriphagus. Strains MSS-170T and MSS-171 had identical 16S rRNA gene sequences and exhibited a mean DNADNA relatedness level of 93 %. The two strains exhibited 16S rRNA gene sequence similarity levels of 96·498·9 % with respect to the type strains of recognized Algoriphagus species. DNADNA relatedness levels between the two strains and the type strains of six Algoriphagus species were less than 35 %. On the basis of phenotypic data and phylogenetic and genetic distinctiveness, strains MSS-170T and MSS-171 were classified in the genus Algoriphagus as members of a novel species, for which the name Algoriphagus locisalis sp. nov. is proposed. The type strain is MSS-170T (=KCTC 12310T=JCM 12597T).
| MAIN TEXT |
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Sea water collected from a marine solar saltern of the Yellow Sea, Korea, was used as the source for the isolation of bacterial strains. Strains MSS-170T and MSS-171 were isolated by using the standard dilution-plating technique on marine agar 2216 (MA; Difco) at 25 °C. A. ratkowskyi CIP 107452T was obtained from the Collection de l'Institut Pasteur (Paris, France). A. aquimarinus LMG 21971T, A. chordae LMG 21970T, A. winogradskyi LMG 21969T and A. antarcticus LMG 21980T were obtained from the Laboratorium voor Microbiologie, Universiteit Gent (Ghent, Belgium). A. yeomjeoni MSS-160T was obtained from the study of Yoon et al. (2005)
. The morphological and physiological characteristics of strains MSS-170T and MSS-171 were investigated on MA at 30 °C. Cell morphology was examined by using light microscopy (E600; Nikon) and transmission electron microscopy. The presence of flagella was investigated by using transmission electron microscopy with cells from exponentially growing cultures. Gliding motility was determined as described by Bowman (2000)
. The Gram-reaction was determined by using the bioMérieux Gram Stain kit according to the manufacturer's instructions. Growth at various temperatures (440 °C) was measured on MA. The pH range for growth was determined in marine broth 2216 (Difco) that had been adjusted to various pH values (initial pH 4·5, rising to pH 10·5 at intervals of 0·5 pH units). The pH was adjusted prior to sterilization to various levels by the addition of Na2CO3. Growth under anaerobic conditions was determined after incubation in a Forma anaerobic chamber on MA and MA supplemented with nitrate, both of which had been prepared anaerobically using nitrogen. Catalase and oxidase activities and hydrolysis of casein and starch were determined as described by Cowan & Steel (1965)
. Hydrolysis of hypoxanthine, tyrosine and xanthine was tested on MA using the substrate concentrations described by Cowan & Steel (1965)
. Hydrolysis of aesculin, gelatin, urea and Tweens 20, 40, 60 and 80 and nitrate reduction were studied as described previously (Lanyi, 1987
) but with the modification that artificial sea water was used for preparation of the media. The artificial sea water contained the following (per litre distilled water): 23·6 g NaCl, 0·64 g KCl, 4·53 g MgCl2.6H2O, 5·94 g MgSO4.7H2O and 1·3 g CaCl2.2H2O (Bruns et al., 2001
). H2S production was tested as described by Bruns et al. (2001)
. The presence of flexirubin pigment was investigated as described by Reichenbach (1992)
. Susceptibility to antibiotics was tested on MA plates by using discs containing the following antibiotics: ampicillin (10 µg), benzylpenicillin (10 µg), carbenicillin (100 µg), gentamicin (10 µg), kanamycin (30 µg), lincomycin (15 µg), neomycin (30 µg), oleandomycin (15 µg), polymyxin B (300 U), streptomycin (10 µg), chloramphenicol (100 µg) or tetracycline (30 µg). Acid production from carbohydrates was determined as described by Leifson (1963)
. Utilization of various substrates for growth was determined as described by Yurkov et al. (1994)
. The morphological, cultural, physiological and biochemical characteristics of strains MSS-170T and MSS-171 are shown in Table 1
or are given in the species description (see below). The two strains were similar in most phenotypic characteristics, except for the utilization of D-trehalose and acid production from D-trehalose.
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The almost-complete 16S rRNA gene sequences of strains MSS-170T and MSS-171 determined in this study each comprised 1477 nucleotides, representing approximately 96 % of the Escherichia coli 16S rRNA gene sequence. The 16S rRNA gene sequences of strains MSS-170T and MSS-171 were identical. Comparative 16S rRNA gene sequence analyses showed that strains MSS-170T and MSS-171 are phylogenetically most related to Algoriphagus species (Fig. 1
). In the phylogenetic tree based on the neighbour-joining algorithm, strains MSS-170T and MSS-171 fell within the radiation of the cluster comprising Algoriphagus species (Fig. 1
). Similar tree topologies were found in the trees generated with the maximum-likelihood and maximum-parsimony algorithms (data not shown). Similarity values between the 16S rRNA gene sequences of the two isolates and those of recognized Algoriphagus species ranged from 96·4 % (A. halophilus IMSNU 14013T) to 98·9 % (A. winogradskyi KMM 3956T). Sequence similarities to other species included in the phylogenetic analysis were below 94·6 % (Fig. 1
).
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7c and/or iso-C15 : 0 2-OH (Table 2
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Description of Algoriphagus locisalis sp. nov.
Algoriphagus locisalis (lo.ci.sa'lis. L. n. locus place, locality; L. gen. n. salis of salt; N.L. gen. n. locisalis from a place of salt).
Cells are Gram-negative, non-flagellated rods that are 0·40·7x1·53·0 µm in size. Non-motile. Colonies are circular, convex, smooth, glistening, orange-coloured and 1·01·8 mm in diameter after 3 days incubation on MA at 30 °C. Optimum growth temperature is 30 °C; growth occurs at 4 and 35 °C, but not at 36 °C. The optimal pH for growth is between pH 7·0 and 8·0; growth is observed at pH 5·5, but not at pH 5·0. Optimal growth occurs in the presence of 2 % (w/v) NaCl; growth does not occur in the presence of >9 % (w/v) NaCl. Growth does not occur under anaerobic conditions on MA or MA supplemented with nitrate. Aesculin and Tweens 20, 40 and 60 are hydrolysed. Hypoxanthine, xanthine, tyrosine and urea are not hydrolysed. Susceptible to chloramphenicol. D-Cellobiose, D-fructose, maltose, sucrose and salicin are utilized as carbon and energy sources, but D-galactose, D-xylose, acetate, benzoate, pyruvate, succinate, formate and L-glutamate are not. Utilization of D-trehalose is variable (positive for type strain). Acid is produced from D-mannose and weakly produced from D-fructose and D-raffinose. No acid is produced from D-melezitose, D-ribose, myo-inositol, D-mannitol or D-sorbitol. Acid production from D-trehalose is variable (positive for type strain). The predominant menaquinone is MK-7. The major fatty acids are iso-C15 : 0 and C16 : 1
7c and/or iso-C15 : 0 2-OH. The DNA G+C content is 42 mol%. Other phenotypic properties are given in Table 1
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The type strain, MSS-170T (=KCTC 12310T=JCM 12597T), was isolated from sea water from a marine solar saltern of the Yellow Sea in Korea.
| ACKNOWLEDGEMENTS |
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