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Pseudacidovorax intermedius gen. nov., sp. nov., a novel nitrogen-fixing betaproteobacterium isolated from soil

¹ Institut für Angewandte Mikrobiologie, Universität Giessen, Giessen, Germany
² College of Agriculture and Natural Resources, Department of Soil & Environmental Sciences, National Chung Hsing University, Taichung, 402 Taiwan, ROC
³ Laboratory of Microbiology, Department of Seafood Science, National Kaohsiung Marine University, No. 142 Hai-Chuan Road, Nan-Tzu, Kaohsiung City 811, Taiwan, ROC

Correspondence
Chiu-Chung Young
ccyoung{at}mail.nchu.edu.tw

A Gram-negative, short rod-shaped, nitrogen-fixing bacterium (CC-21^T) was isolated from a soil sample collected from the regional agricultural research station in Kaohsiung County (Taiwan). Using 16S rRNA gene sequence analysis, it could be clearly demonstrated that this isolate was novel: it showed <97 % similarity to species of the genera Acidovorax, Alicycliphilus, Giesbergeria, Simplicispira and Diaphorobacter. The organism used several organic acids, but only a few sugars as substrates. The fatty acid profile differed from those reported for members of the genera Acidovorax, Alicycliphilus, Giesbergeria, Simplicispira and Diaphorobacter. On the basis of 16S rRNA gene sequence analysis in combination with physiological data, strain CC-21^T represents a novel species in a new genus, for which the name Pseudacidovorax intermedius gen. nov., sp. nov. is proposed; the type strain is CC-21^T (=CCUG 54492^T=CIP 109510^T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA and nifH gene sequences of strain CC-21^T are EF469609 and EU008822, respectively.

A nifH gene sequence-based phylogenetic tree generated by using the neighbour-joining method, showing the relationship between strain CC-21^T and other dinitrogen-fixing bacteria, is available as a supplementary figure with the online version of this paper.