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Abstract

A novel alphaproteobacterium, strain LD81, was isolated from the marine macroalga . The bacterium is mesophilic and shows a typical marine growth response. It is a chemoheterotrophic aerobe with the potential for denitrification. Growth optima are 25 °C, pH 5.5 and 3 % NaCl. Strain LD81 has a unique phylogenetic position, not fitting any of the known families of the . The 16S rRNA gene sequence revealed a distant relationship to species of several orders of the , with less than 90 % sequence similarity. Phylogenetically, strain LD81 is related to the type strains of (88.4 % 16S rRNA gene sequence similarity) and the three species (88.9–89.2 %). It forms a cluster with these bacteria and a novel as-yet undescribed isolate (KOPRI 13522; 96.6 % sequence similarity). Strain LD81 has a relatively low DNA G+C content (51.1 mol%) and, due to its distant phylogenetic position from all other alphaproteobacteria, strain LD81 (=NCIMB 14374 =JCM 14845) is considered as the type strain of a novel species within a new genus, for which the name gen. nov., sp. nov. is proposed. The genus represents the type of the new family fam. nov. and order ord. nov.

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2009-02-01
2024-03-28
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vol. , part 2, pp. 350 - 356

16S rRNA gene sequence similarity between strain LD81 and type strains of related species of the . [PDF](16 KB)



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