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Sphingobium rhizovicinum sp. nov., isolated from rhizosphere soil of Fortunella hindsii (Champ. ex Benth.) Swingle

¹ College of Agriculture and Natural Resources, Department of Soil and Environmental Sciences, National Chung Hsing University, Taichung 402, Taiwan, ROC
² Institut für Angewandte Mikrobiologie, Universität Giessen, Giessen, Germany
³ Institut für Bakteriologie, Mykologie und Hygiene, Veterinärmedizinische Universität Wien, A-1210 Wien, Austria
⁴ Laboratory of Microbiology, Department of Sea food Science, National Kaohsiung Institute of Marine Technology, Nan-Tzu, Kaohsiung 811, Taiwan, ROC

Correspondence
P. Kämpfer
peter.kaempfer{at}umwelt.uni-giessen.de

The taxonomic status of a pale-yellow-coloured bacterial isolate from rhizosphere soil of Fortunella hindsii (Champ. ex Benth.) Swingle was characterized using a polyphasic taxonomic approach. Comparative analysis of the 16S rRNA gene sequence showed that the isolate constituted a distinct branch within the genus Sphingobium. The generic assignment was confirmed by chemotaxonomic data, which revealed the presence of a fatty acid profile that was characteristic for the genus Sphingobium, consisting of straight-chain saturated and unsaturated as well as 2-OH fatty acids and the lack of 3-OH fatty acids, ubiquinone with ten isoprene units (Q-10) as the predominant respiratory quinone, and a polar lipid pattern that consisted of the predominant compounds phosphatidylethanolamine, phosphatidylglycerol, phosphatidylmonomethylethanolamine, phosphatidyldimethylethanolamine, diphosphatidylglycerol, sphingoglycolipid and an unknown glycolipid. Spermidine was the major polyamine component. The genotypic and phenotypic data (physiology and fatty acid and polar lipid profiles) showed that the isolate merits classification as representing a novel species of the genus Sphingobium, for which the name Sphingobium rhizovicinum sp. nov. is proposed. The type strain is CC-FH12-1^T (=CCM 7941^T=BCRC 17770^T).

A figure showing the polar lipid profile of strain CC-FH12-1^T and a table showing the cellular fatty acid contents of strain CC-FH12-1^T and recognized Sphingobium species are available as supplementary material with the online version of this paper.

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