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Description of two novel species, Sphingomonas abaci sp. nov. and Sphingomonas panni sp. nov.

¹ Institut für Bakteriologie, Mykologie und Hygiene, Veterinärmedizinische Universität, Veterinärplatz 1, A-1210 Vienna, Austria
² Institut für Angewandte Mikrobiologie, Justus-Liebig-Universität Giessen, D-35392 Giessen, Germany

Correspondence
Hans-Jürgen Busse
hans-juergen.busse{at}vu-wien.ac.at

Two Gram-negative, rod-shaped, non-spore-forming bacterial strains designated C42^T and C52^T were isolated in the Medical Clinic for Small Animals and Ungulates at the University for Veterinary Medicine Vienna, Austria. On the basis of 16S rRNA gene sequence similarity, both strains were shown to belong to the genus Sphingomonas. Strain C42^T showed the greatest levels of sequence similarity with Sphingomonas melonis DSM 14444^T and Sphingomonas aquatilis KCTC 2881^T (both 97·7 %). Strain C52^T showed the greatest levels of sequence similarity with Sphingomonas koreensis KCTC 2882^T (97·2 %), Sphingomonas aquatilis KCTC 2881^T (97·1 %) and S. melonis DSM 14444^T (97·0 %). The presence of Q-10 as the main ubiquinone, the predominance of the compound sym-homospermidine in the polyamine patterns, the presence of a Sphingomonadaceae-specific sphingoglycolipid in the polar lipid patterns, the presence of the fatty acid 2-OH C_{14 : 0} and the lack of 3-hydroxy fatty acids supported the identification of the two novel strains as members of the genus Sphingomonas sensu stricto. Unique physiological characteristics, protein patterns, quantitative differences in their fatty acid profiles and the results of genomic fingerprinting and DNA–DNA hybridizations differentiated strains C42^T and C52^T from closely related Sphingomonas species. Hence, the two strains are described as novel species of the genus Sphingomonas sensu stricto. The names Sphingomonas abaci sp. nov. (type strain C42^T=LMG 21978^T=DSM 15867^T) and Sphingomonas panni sp. nov. (type strain C52^T=LMG 21979^T=DSM 15761^T) are proposed.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of Sphingomonas abaci C42^T and Sphingomonas panni C52^T are AJ575817 and AJ575818, respectively.

The fatty acid content, polar lipid profiles, protein patterns and genomic fingerprints of strains C42^T and C52^T are available as supplementary data in IJSEM Online.

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