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|標題:||Azonexus hydrophilus sp nov., a nifH gene-harbouring bacterium isolated from freshwater||作者:||Chou, J.H.
|關鍵字:||deoxyribonucleic-acid;pcr;proteobacteria;identification;sequences;strains||Project:||International Journal of Systematic and Evolutionary Microbiology||期刊/報告no：:||International Journal of Systematic and Evolutionary Microbiology, Volume 58, Page(s) 946-951.||摘要:||
Three Gram-negative, non-pigmented, rod-shaped, facultatively aerobic bacterial strains, designated d8-1(T), d8-2 and IMCC1716, were isolated from a freshwater spring sample and a eutrophic freshwater pond. Based on characterization using a polyphasic approach, the three strains showed highly similar phenotypic, physiological and genetic characteristics. All of the strains harboured the nitrogenase gene nifH, but nitrogen-fixing activities could not be detected in nitrogen-free culture media. The three strains shared 99.6-99.7 % 16S rRNA gene sequence similarity and showed 89-100 % DNA-DNA relatedness, suggesting that they represent a single genomic species. Phylogenetic analysis based on 16S rRNA gene sequences showed that strains d8-1(T), d8-2 and IMCC1716 formed a monophyletic branch in the periphery of the evolutionary radiation occupied by the genus Azonexus. Their closest neighbours; were Azonexus caeni Slu-05(T) (96.7-96.8% similarity) and Azonexus fungiphilus BS5-8(T) (96.3-96.6 %). The DNA-DNA relatedness of the novel strains to these two species of the genus Azonexus was less than 70%. The isolates could also be differentiated from recognized members of the genus Azonexus on the basis of phenotypic and biochemical characteristics. It is evident, therefore, that the three strains represent a novel species of the genus Azonexus, for which the name Azonexus hydrophilus sp. nov. is proposed. The type strain is d8-1(T) (=LMG 24005(T)=BCRC 17657 (T)).
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