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Abstract
A light-yellow-coloured bacterium, designated strain 4T-6T, was isolated from cotton waste compost in Korea. Cells of the strain were strictly aerobic, Gram-negative, motile (by means of single polar flagella) and rod-shaped. Optimal growth occurred at 30 °C and at pH 7.0–8.0. The major fatty acids were 11-methyl C18 : 1 ω7c (23.8 %), C18 : 1 ω7c (23.2 %), C16 : 0 (19.8 %) and C17 : 0 (14.8 %). The DNA G+C content was 67.5 mol%. A phylogenetic analysis based on 16S rRNA gene sequences revealed that strain 4T-6T was a member of the genus Phenylobacterium, showing the highest sequence similarities with those of ‘Phenylobacterium zucineum’ HLK1 (98.8 %) and Phenylobacterium lituiforme DSM 14363T (98.4 %). However, the values for DNA–DNA relatedness between strain 4T-6T and ‘P. zucineum’ HLK1 and P. lituiforme DSM 14363T were 45 and 43 %, respectively. Phylogenetic characteristics, physiological properties and DNA–DNA hybridization data indicate that strain 4T-6T represents a novel species of the genus Phenylobacterium, for which the name Phenylobacterium composti sp. nov. is proposed. The type strain is 4T-6T (=KACC 12597T=DSM 19425T).
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