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Pedobacter terrae sp. nov., isolated from soil

Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Korea

Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr

A Gram-negative, non-motile, rod-shaped bacterial strain, DS-57^T, was isolated from soil from Dokdo, Korea, and its taxonomic position was investigated using a polyphasic approach. It grew optimally at 25 °C and in trypticase soy broth without NaCl and trypticase soy broth with 0.5 % NaCl. Strain DS-57^T contained MK-7 as the predominant menaquinone and iso-C_{15 : 0}, C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH and iso-C_{17 : 0} 3-OH as the major fatty acids. The DNA G+C content was 39.7 mol%. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain DS-57^T was most closely related to the genus Pedobacter of the family Sphingobacteriaceae, clustering coherently with Pedobacter suwonensis, Pedobacter roseus and Pedobacter sandarakinus. Strain DS-57^T exhibited 16S rRNA gene sequence similarity values of 99.2, 97.9 and 97.2 % with respect to the type strains of P. suwonensis, P. roseus and P. sandarakinus, respectively, and values less than 95.6 % with respect to the type strains of other Pedobacter species. Strain DS-57^T exhibited levels of DNA–DNA relatedness of 45, 17 and 15 % with respect to the type strains of P. suwonensis, P. roseus and P. sandarakinus, respectively. Differential phenotypic properties, together with the phylogenetic distinctiveness and the DNA–DNA relatedness data, were sufficient to allow the classification of strain DS-57^T as a species that is separate from recognized Pedobacter species. On the basis of phenotypic properties and phylogenetic distinctiveness, therefore, strain DS-57^T represents a novel species of the genus Pedobacter, for which the name Pedobacter terrae sp. nov. is proposed. The type strain is DS-57^T (=KCTC 12762^T=DSM 17933^T).

The cellular fatty acid content of strain DS-57^T and phylogenetically related Pedobacter species is presented in a supplementary table available with the online version of this paper.