Pseudonocardia eucalypti sp. nov., an endophytic actinobacterium with a unique knobby spore surface, isolated from the surface-sterilized root of a native Australian eucalyptus tree

Onuma Kaewkla, Christopher Franco

    Research output: Contribution to journalArticle

    19 Citations (Scopus)

    Abstract

    A novel strain, designated EUM 374T, was isolated from the root of a native Australian eucalyptus tree, Eucalyptus microcarpa, and subjected to a range of morphological, phylogenetic and chemotaxonomic analyses. The strain was Gram-reaction-positive with well-developed aerial mycelia, which fragmented into rod-shaped spores that had unique knobby protrusions on the spore surface. Substrate mycelia were not present in the media used. Strain EUM 374T grew as a film on the surface of static liquid culture medium but did not grow under shaking conditions. Phylogenetic evaluation based on 16S rRNA gene sequences identified the new isolate as belonging to the family Pseudonocardiaceae with sequence similarities of 96.1 and 96.3% to Pseudonocardia acaciae GMKU095T and Pseudonocardia spinosispora LM 141T, respectively, and 93-96% sequence similarity to other members of the genus Pseudonocardia. The results of comprehensive phylogenetic analyses, including physiological and biochemical tests, differentiated strain EUM 374T from related members of the genus Pseudonocardia. Based on the phenotypic, phylogenetic and chemotaxonomic evidence, strain EUM 374T represents a novel species of the genus Pseudonocardia, for which the name Pseudonocardia eucalypti sp. nov. is proposed. The type strain is EUM 374T (=DSM 45351T =ACM 5285T).

    Original languageEnglish
    Pages (from-to)742-746
    Number of pages5
    JournalInternational Journal of Systematic and Evolutionary Microbiology
    Volume61
    Issue number4
    DOIs
    Publication statusPublished - 2011

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