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Mesorhizobium thiogangeticum sp. nov., a novel sulfur-oxidizing chemolithoautotroph from rhizosphere soil of an Indian tropical leguminous plant

Department of Microbiology, Bose Institute, P-1/12, CIT Scheme VII-M, Kolkata – 700 054, India

Correspondence
Wriddhiman Ghosh
Wriman{at}rediffmail.com

The bacterial strain SJT^T, along with 15 other mesophilic, neutrophilic and facultatively sulfur-oxidizing chemolithotrophic isolates, was isolated by enrichment on reduced sulfur compounds as the sole energy and electron source from soils immediately adjacent to the roots of Clitoria ternatea, a slender leguminous herb of the Lower Gangetic plains of India. Strain SJT^T was able to oxidize thiosulfate and elemental sulfur for chemolithoautotrophic growth. 16S rRNA and recA gene sequence-based phylogenetic analyses showed that the Gram-negative rod-shaped bacterium belonged to the genus Mesorhizobium and was most closely related to Mesorhizobium loti, Mesorhizobium plurifarium, Mesorhizobium amorphae and Mesorhizobium chacoense. Unequivocally low 16S rRNA (<97 %) and recA (88 %) gene sequence similarities to all existing species of the most closely related genera, a unique fatty acid profile, a distinct G+C content (59·6 mol%) and phenotypic characteristics all suggested that strain SJT^T represents a novel species. DNA–DNA hybridization and SDS-PAGE analysis of whole-cell proteins also confirmed the taxonomic uniqueness of SJT^T. It is therefore proposed that isolate SJT^T (=LMG 22697^T=MTCC 7001^T) be classified as the type strain of a novel species, Mesorhizobium thiogangeticum sp. nov.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA and recA gene sequences of the strain SJT^T are AJ864462 and AM040610, respectively.

Fatty acid profiles, a phenogram derived from UPGMA/S_SM analysis and SDS-PAGE analysis of whole-cell proteins of strain SJT^T and related species are available as supplementary material in IJSEM Online.

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