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A Gram-reaction-negative, yellow-pigmented strain, designated EX36T, was characterized using a polyphasic approach comprising phylogenetic, morphological and genotypic analyses. The endophytic strain was isolated from Zn/Cd-accumulating Salix caprea in Arnoldstein, Austria. Analysis of the 16S rRNA gene demonstrated that the novel strain is most closely related to members of the genus Spirosoma (95 % sequence similarity with Spirosoma linguale ). The genomic DNA G+C content was 47.2 mol%. The predominant quinone was and the major cellular fatty acids were summed feature 3 (iso-C15 : 0 2-OH and/or C16 : 1ω7c), C16 : 1ω5c, iso-C17 : 0 3-OH and iso-C15 : 0. On the basis of its phenotypic and genotypic properties, strain EX36T should be classified as a novel species of the genus Spirosoma , for which the name Spirosoma endophyticum sp. nov. is proposed. The type strain is EX36T ( = DSM 26130T = LMG 27272T).
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