title: Identification of pink-pigmented bacteria isolated from environmental water samples and their biofilm formation abilities.
abstract: Sixty-seven strains of pink-pigmented bacteria, which were isolated from environmental water samples collected nationwide, were identified by partial 16S rDNA sequence analysis. In addition, the biofilm formation ability of the isolates was experimentally investigated. We could identify only 2 strains at the species level: Pedobacter roseus HS-38 and Runella slithyformis HS-77. The results showed that of the strains tested, 22 strains (32.8%) were Pedobacter spp., which was most frequently identified, followed by 19 strains (28.4%) of Arcicella spp., 16 strains (23.9%) of Deinococcus spp., 5 strains (7.5%) of Roseomonas spp., 4 strains (6.0%) of Flectobacillus spp. and 1 strain (1.5%) of Runella sp. Most isolates showed low similarity values to previously known species, and they were found to be novel species. At a result, it was difficult to identify environmental water-derived pink-pigmented bacteria at the species level. On the other hand, when we measured the absorbance by the crystal violet staining to examine the quantities of biofilm formation of these strains, fifty-five (82.0%) of the 67 isolates formed biofilm. The absorbance of Deinococcus sp. HS-75 was the highest (3.56). When comparing the absorbance values among the genera, Roseomonas spp. showed the highest absorbance (mean:1.62), followed by Deinococcus spp. (mean: 1.03), and Arcicella spp. (mean: 1.01). Strains of Flectobacillus spp. (mean: 0.48) and Pedobacter spp. (mean: 0.42) showed lower absorbance values. As above, it was shown that, at the species level, the pink-pigmented bacteria in the water in the Japanese environment had various levels of ability to form biofilm.
authors.affiliation: School of Life and Environmental Science, Azabu University, 1-17-71, Fuchinobe, Sagamihara, Kanagawa 229-8501, Japan.
authors.forename: Katsunori
authors.initials: K
authors.lastname: Furuhata
authors.forename: Yuko
authors.initials: Y
authors.lastname: Kato
authors.forename: Keiichi
authors.initials: K
authors.lastname: Goto
authors.forename: Keiko
authors.initials: K
authors.lastname: Saitou
authors.forename: Jun-Ichi
authors.initials: J
authors.lastname: Sugiyama
authors.forename: Motonobu
authors.initials: M
authors.lastname: Hara
authors.forename: Masahumi
authors.initials: M
authors.lastname: Fukuyama
mesh_terms: D001419:Bacteria / Q000235:genetics / Q000302:isolation & purification*; D018441:Biofilms / Q000254:growth & development*; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000737:chemistry / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D014871:Water Microbiology
chemical_list: D004269:DNA, Bacterial; D012336:RNA, Ribosomal, 16S