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Arthrobacter oryzae sp. nov. and Arthrobacter humicola sp. nov.

Akiko Kageyama¹, Kurimi Morisaki¹, Satoshi mura^1,2 and Yoko Takahashi¹

¹ Kitasato Institute for Life Sciences, Kitasato University, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan
² The Kitasato Institute, 5-9-1 Shirokane, Minato-ku, Tokyo 108-8641, Japan

Correspondence
Yoko Takahashi
ytakaha{at}lisci.kitasato-u.ac.jp

Two novel bacterial strains were isolated from a paddy soil sample collected in Japan using GPM agar plates supplemented with superoxide dismutase and/or catalase. The strains were Gram-positive, catalase-positive and motile, with lysine as the peptidoglycan diagnostic diamino acid and acetyl as the peptidoglycan acyl type. The major menaquinone was MK-9(H₂). Mycolic acids were not detected. The G+C content of the DNA was 66–68 mol%. On the basis of phenotypic analysis, 16S rRNA gene sequence comparisons and DNA–DNA hybridization data, it is proposed that these strains represent two novel species, Arthrobacter oryzae sp. nov. (type strain is KV-651^T=NRRL B-24478^T=NBRC 102055^T) and Arthrobacter humicola sp. nov. (type strain is KV-653^T=NRRL B-24479^T=NBRC 102056^T), respectively.

Supplementary tables detailing 16S rRNA gene sequence similarity values and DNA–DNA relatedness values between the two isolated strains and related species and scanning electron micrographs (Fig. S1) and transmission electron micrographs (Fig. S2) of cells of strain KV-653^T are available with the online version of this paper.

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