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Abstract
A Gram-stain-positive, aerobic, endospore-forming, moderately halophilic rod, designated strain R1T, was isolated from rice husks and subjected to a taxonomic study using a polyphasic approach. Strain R1T produced spherical or ellipsoidal endospores at a subterminal position in swollen sporangia, and was catalase- and oxidase-positive. The isolate grew optimally at 37 °C and pH 6.0–7.0, and could grow in the presence of up to 9 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain R1T belongs to the genus Bacillus . The closest relatives of strain R1T were Bacillus subtilis subsp. subtilis NCIB 3610T, Bacillus aquimaris TF-12T, and Bacillus marisflavi TF-11T, with 16S rRNA gene sequence similarities of 96.0 %, 98.4 %, and 98.7 %, respectively. DNA–DNA relatedness values between the isolate and the reference strains were ≤42±3 %. The predominant menaquinones were MK-5 (50 %) and MK-7 (50 %). The major polar lipids were phosphatidylglycerol, diphosphatidylglycerol, and phosphatidylethanolamine. The major cellular fatty acids were iso-C15 : 0 (48.6 %) and anteiso-C15 : 0 (20.6 %), and the cell-wall diamino acid was meso-diaminopimelic acid. On the basis of 16S rRNA gene sequence analyses and chemotaxonomic and phenotypic characteristics, it is concluded that strain R1T represents a novel species of the genus Bacillus , for which we propose the name Bacillus oryzaecorticis sp. nov. The type strain is R1T ( = KACC 17217T = KCCM 90231T = JCM 19602T).
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Funding
- Yonsei University Research Fund of 2012 and 2013
- Postdoctoral Fellowship Program of National Institute of Animal Science, Rural Development Administration, Republic of Korea