1887

Abstract

Several strains of phototrophic purple nonsulfur bacteria were isolated from colored blooms occurring in tidal and seawater pools in Japan. All of these isolates had ovoid to rod-shaped cells that were motile by means of single polar flagella and contained vesicular intracytoplasmic membranes together with bacteriochlorophyll and carotenoids of the spheroidene series. They produced ubiquinone 10 as the major quinone and contained straight-chain fatty acids, with Cpredominating. They were mesophilic, halophilic, and photoheterotrophic, utilized sulfide and thiosulfate as electron donors for phototrophic growth, and photoassimilated a wide variety of organic compounds as carbon sources. Our results suggested that all of these isolates are members of the recently described genus . The isolates were classified into four groups (designated groups I through IV) on the basis of phenotypic and genotypic data. The group I isolates, which were the most abundant purple nonsulfur bacteria recovered from the blooms, grew in the presence of NaCl concentrations ranging from 0.5 to 3.0% (optimum NaCl concentration, 0.8%) and at pH values ranging from 7.5 to 9.0 (optimum pH, 8.0 to 8.5). On the basis of these unique physiological traits, together with genotypic and phylogenetic data, we propose that the group I isolates should be classified as members of a new species, . The group II isolates were identified definitely as , and the group III and IV isolates were phenotypically most similar to . and , respectively, but could be differentiated from these specks by DNA-DNA pairing data.

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1995-04-01
2022-09-27
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