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A Gram-negative-staining, non-spore-forming bacterium devoid of flagella, designated strain B9T, was isolated from rice paddy soil associated with the roots of Oryza sativa collected from Jinju, South Korea. Cells were straight rods, were catalase- and oxidase-positive and were able to hydrolyse pectin, xylan and laminarin. Growth of strain B9T was observed between 15 and 35 °C (optimum 25–30 °C) and between pH 5.0 and 8.0 (optimum pH 6.5–7.5). Strain B9T contained menaquinone-7 (MK-7) as a major isoprenoid quinone and summed feature 3 (C16 : 1 ω7c and/or iso-C15 : 0 2-OH), iso-C15 : 0 and C16 : 0 as major fatty acids. The G+C content of the genomic DNA was 44.4 mol%. Comparative 16S rRNA gene sequence analysis showed that strain B9T belonged to the genus Mucilaginibacter, a member of the family Sphingobacteriaceae, and was most closely related to Mucilaginibacter kameinonensis SCKT (95.9 % sequence similarity). On the basis of chemotaxonomic data and molecular properties, strain B9T represents a novel species of the genus Mucilaginibacter, for which the name Mucilaginibacter oryzae sp. nov. is proposed. The type strain is B9T (=KACC 12816T =DSM 19975T).
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International Journal of Systematic and Evolutionary Microbiology vol. 59 , part 6, pp. 1451 - 1454
Supplementary Fig. S1. Transmission electron micrograph showing the general morphology of a negatively stained cell of strain B9 Tafter growth for 3 days at 30 °C on R2A agar. Bar, 700 nm.