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Published online ahead of print on 23 October 2009 as doi:ijs.0.011718-0
Int J Syst Evol Microbiol (2009); DOI 10.1099/ijs.0.011718-0
© 2009 International Union of Microbiological Societies
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Rhodobacter johrii sp. nov., an endospore producing cryptic Rhodobacter species isolated from semi-arid tropical soils

K. R. Girija1, Ch. Sasikala1, Ch. V. Ramana2,6, C. Spröer3, S. Takaichi4, V. Thiel5 and J. F. Imhoff5

1 JNT University, Hyderabad;
2 University of Hyderabad;
3 DSMZ, Germany;
4 Nippon Medical School, Japan;
5 IFM-GEOMAR, Kiel, Germany

6 E-mail: r449{at}sify.com

An oval to rod shaped phototrophic purple nonsulfur bacterium, strain JA192T was isolated from an enrichment culture of a pasteurized rhizosphere soil sample of jowar crop collected from Godumakunta village, near Hyderabad, India. Strain JA192T is Gram-negative, motile and produces endospores. Phylogenetic analysis on the basis of 16S rRNA gene sequences showed that the strain JA192T is closely related to Rhodobacter sphaeroides DSM 158T (99.9% sequence similarity), Rhodobacter megalophilus JA194T (99.8%) and Rhodobacter azotoformans JCM 9340T (98.1%) and clusters with other species of the genus Rhodobacter of the family Rhodobacteraceae. However, DNA-DNA hybridization with Rba. sphaeroides DSM 158T, Rba. megalophilus JA194T and Rba. azotoformans JCM 9320T showed a relatedness of only 38-57% with respect to JA192T. On the basis of 16S rRNA gene sequence analysis, DNA-DNA hybridization data, morphological, physiological and chemotaxanomic characters, strain JA192T represents a novel species of the genus Rhodobacter, for which the name Rhodobacter johrii sp. nov. is proposed. The type strain is JA192T (= DSM 18678T = JCM 14543T = MTCC 8172T).






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