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Int J Syst Evol Microbiol 58 (2008), 2654-2659; DOI  10.1099/ijs.0.65806-0
© 2008 International Union of Microbiological Societies

Taxonomic analysis of Sorangium strains based on HSP60 and 16S rRNA gene sequences and morphology

De-Ming Jiang, Lin Zhao, Cui-Ying Zhang, Jian Li, Zhi-Jie Xia, Jing Wang, Zhi-Hong Wu and Yue-Zhong Li

State Key Laboratory of Microbial Technology, College of Life Science, Shandong University, Jinan 250100, PR China

Correspondence
Yue-Zhong Li
lilab{at}sdu.edu.cn

The taxonomy of myxobacteria is based mainly on their morphological characteristics. The genus Sorangium belongs to the myxobacterial suborder Sorangiineae. Strains in the genus were classified either as one species, Sorangium cellulosum, by ignoring divergent morphological characteristics, or into several species; however, the latter classification is based on some dubious morphological characteristics and is inconsistent with the phylogeny constructed from 16S rRNA gene sequences. In this study, two HSP60 (groEL1 and groEL2) genes were amplified and sequenced from 22 Sorangium strains. The groEL1 and groEL2 gene sequences were highly conserved in Sorangium strains, suggesting that these two paralogous genes both play important roles in the life cycle. The phylogeny constructed by the groEL genes was rather consistent with the morphological characteristics of sporangioles. Including information from the phylogenetic analysis and morphological characteristics, it is suggested that the genus Sorangium includes two species.

The GenBank/EMBL/DDBJ accession numbers for the sequences reported in this paper are EU240489–EU240498 and EU240530–EU240533 (16S rRNA genes), EU240499–EU240520 (groEL1) and EU240521–EU240529 (groEL2).

Micrographs of Sorangium strains and an alignment of 16S rRNA gene sequences are available as supplementary material with the online version of this paper.






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