Planococcus halophilus sp.nov., a Facultatively Halophilic Coccus

Novitsky, Thomas J.; Kushner, D. J.

doi:10.1099/00207713-26-1-53

Cited by 42 publications

(12 citation statements)

References 17 publications

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“…The genus Marinococcus was proposed to accommodate two species, Marinococcus albus and Marinococcus halophilus; both species were formerly classified as Planococcus species (Novitsky & Kushner, 1976;Hao et al, 1984). They have meso-diaminopimelic acid in the cell wall, a DNA G+C content ranging between 43?9 and 46?6 mol%, a menaquinone system with MK-7, grow at a concentration of 20 % NaCl, and are motile cocci.…”

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Marinococcus halotolerans sp. nov., isolated from Qinghai, north-west China

Schümann

Zhang

et al. 2005

International Journal of Systematic and Evolutionary Microbiology

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Marinococcus halotolerans sp. nov., isolated from Qinghai, north-west China

Schümann

Zhang

et al. 2005

International Journal of Systematic and Evolutionary Microbiology

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“…The lack of systematic studies of isolates from natural sources has resulted in a scarcity of taxonomic information concerning moderate halophiles. Most of the descriptions refer to organisms isolated from salted food (Buchanan & Gibbons, 1974) or found as accidental laboratory contaminants (Novitsky & Kushner, 1976).…”

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Numerical Taxonomy of Moderately Halophilic Gram-negative Bacteria from Hypersaline Soils

et al. 1983

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A total of 132 moderately halophilic bacteria were isolated from hypersaline soils with a C1-content between 2-36 and 12.72% (w/v) located near Alicante (S.E. Spain) and examined for 98 phenotypic characteristics including their response to cytological, physiological, biochemical and nutritional tests. They were submitted to a numerical analysis together with six reference strains using both simple matching (SsM) and Jaccard (S,) coefficients, and cluster analysis was carried out by the unweighted pair group method of association (UPGMA), single linkage and complete linkage. With the S, coefficient and UPGMA clustering, eight phenons were obtained at the 65% similarity level. From each phenon representative strains were chosen for the determination of DNA base composition and for electron microscopy. Bacteria belonging to phenons D, E, and F were assigned to the genus Alcaligenes. Phenon G included 27 strains assigned to Acinetobacter, but the high G + C composition (58.9 mol%) of a representative strain of this phenon suggests that it may represent a new taxon. Phenons A, B, and C were designated Flavobacterium and phenon H was Pseudomonas. The bacteria found in these environments are not related to those from hypersaline waters or normal soils.

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“…Similarly, "Pseudomonas halosaccharolytica" (proposed name) grew faster with elevated salinities at elevated temperatures (51). Growth curves of a facultatively halophilic coccoid bacterium isolated from salted mackerel (ultimately classified as Marinococcus halophilus [23,49]) likewise showed that the T opt was 35°C with 1.0 M NaCl but that the T max with 0.1 M NaCl was only 30°C (48). This salinity-temperature relationship, however, is sometimes observed only for a single cardinal growth parameter or not at all (8,21,29,47,75,78).…”

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Synchronous Effects of Temperature, Hydrostatic Pressure, and Salinity on Growth, Phospholipid Profiles, and Protein Patterns of Four Halomonas Species Isolated from Deep-Sea Hydrothermal-Vent and Sea Surface Environments

Kaye

Baross

2004

Appl Environ Microbiol

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Four strains of euryhaline bacteria belonging to the genus Halomonas were tested for their response to a range of temperatures (2, 13, and 30°C), hydrostatic pressures (0.1, 7.5, 15, 25, 35, 45, and 55 MPa), and salinities (4, 11, and 17% total salts). The isolates were psychrotolerant, halophilic to moderately halophilic, and piezotolerant, growing fastest at 30°C, 0.1 MPa, and 4% total salts. Little or no growth occurred at the highest hydrostatic pressures tested, an effect that was more pronounced with decreasing temperatures. Growth curves suggested that the Halomonas strains tested would grow well in cool to warm hydrothermal-vent and associated subseafloor habitats, but poorly or not at all under cold deep-sea conditions. The intermediate salinity tested enhanced growth under certain high-hydrostatic-pressure and low-temperature conditions, highlighting a synergistic effect on growth for these combined stresses. Phospholipid profiles obtained at 30°C indicated that hydrostatic pressure exerted the dominant control on the degree of lipid saturation, although elevated salinity slightly mitigated the increased degree of lipid unsaturation caused by increased hydrostatic pressure. Profiles of cytosolic and membrane proteins of Halomonas axialensis and H. hydrothermalis performed at 30°C under various salinities and hydrostatic pressure conditions indicated several hydrostatic pressure and salinity effects, including proteins whose expression was induced by either an elevated salinity or hydrostatic pressure, but not by a combination of the two. The interplay between salinity and hydrostatic pressure on microbial growth and physiology suggests that adaptations to hydrostatic pressure and possibly other stresses may partially explain the euryhaline phenotype of members of the genus Halomonas living in deep-sea environments.Euryhaline bacteria, which can grow over an extremely wide salt range, are nearly ubiquitous in marine environments and are often cultured from deep-sea sediments and hydrothermal vents (32,52,70,76). These microorganisms are also abundant; bacteria capable of growth on media with 17% total salts, including primarily members of the genera Halomonas and Marinobacter, were found to comprise a remarkably high percentage (up to Ͼ10%) of the total microbial community in hydrothermal-vent habitats and the overlying water column in the North and South Pacific ocean (32). Several recently characterized Halomonas strains isolated from low-temperature hydrothermal fluids, hydrothermal plumes, and sulfide rock, including those from 1:50 to 1:500 fluid dilution enrichments, were found to have a minimum growth temperature of Ϫ1 to 2°C at 0.1 MPa and 4% total salts (33), similar to Antarctic Halomonas isolates (38,58,76). This low minimum temperature for growth closely matches the temperature of the deep sea below 1,500 m (and shallower towards the poles) and leaves open the question of whether Halomonas strains collected from the deep sea, despite their numerical significance, are able to grow in situ in ...

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Planococcus halophilus sp.nov., a Facultatively Halophilic Coccus

Cited by 42 publications

References 17 publications

Marinococcus halotolerans sp. nov., isolated from Qinghai, north-west China

Marinococcus halotolerans sp. nov., isolated from Qinghai, north-west China

Numerical Taxonomy of Moderately Halophilic Gram-negative Bacteria from Hypersaline Soils

Synchronous Effects of Temperature, Hydrostatic Pressure, and Salinity on Growth, Phospholipid Profiles, and Protein Patterns of Four Halomonas Species Isolated from Deep-Sea Hydrothermal-Vent and Sea Surface Environments

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