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Laboratory of Bioresources, Institute of Molecular and Cellular Biosciences, The University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
Correspondence
Linxian Ding
ding-lin-xian{at}nite.go.jp
Two strains of curved bacteria, 7-1T and 7-2T, isolated from well water, were phylogenetically examined to determine their taxonomic position. Strain 7-1T is a Gram-negative, slightly curved rod. Analysis of the 16S rRNA gene sequence showed that strain 7-1T formed a cluster with [Aquaspirillum] delicatum and [Pseudomonas] lanceolata. It has some similar characteristics to [A.] delicatum and [P.] lanceolata, but has sufficient distance to separate it from other genera. DNA–DNA hybridization analysis, as well as chemotaxonomic and morphological studies, demonstrated that strain 7-1T, [A.] delicatum and [P.] lanceolata belong to a new genus, Curvibacter gen. nov. Strain 7-1T (=IAM 15033T=ATCC BAA-807T) is classified as the type strain of Curvibacter gracilis gen. nov., sp. nov., and [A.] delicatum and [P.] lanceolata are classified as Curvibacter delicatus comb. nov. and Curvibacter lanceolatus comb. nov., respectively. Strain 7-2T is a Gram-negative spirillum. Phylogenetic study based on the 16S rRNA gene sequences showed that it formed a cluster with the members of the genus Herbaspirillum, [Pseudomonas] huttiensis and [Aquaspirillum] autotrophicum. The classification is therefore proposed of strain 7-2T (=IAM 15032T=ATCC BAA-806T) as the type strain of Herbaspirillum putei sp. nov., and [P.] huttiensis and [A.] autotrophicum are transferred to the genus Herbaspirillum as Herbaspirillum huttiense comb. nov. and Herbaspirillum autotrophicum comb. nov., respectively.
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains 7-1T and 7-2T are AB109890 and AB109889.
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