Paracoccus bengalensis sp. nov., a novel sulfur-oxidizing chemolithoautotroph from the rhizospheric soil of an Indian tropical leguminous plant

Syst Appl Microbiol. 2006 Jul;29(5):396-403. doi: 10.1016/j.syapm.2005.10.004. Epub 2005 Nov 4.


Paracoccus versutus-like isolates from the rhizosphere of Clitoria ternatea, a slender leguminous herb (family--Papilionaceae), found ubiquitously in waste places and village forests of the Lower Gangetic plains of India, presented a case of graduated infraspecific variation that was capped by the identification of a new species Paracoccus bengalensis (type strain JJJ(T) = LMG 22700(T) = MTCC 7003(T)). The diverged phenetic and genetic structure of these sulfur-oxidizing chemolithoautotrophs presented a case of apparent nonconformity of 16S rRNA gene sequence similarities with results of DNA-DNA hybridization. Despite high 16S rRNA gene sequence similarity with P. versutus one of the newly isolated strains, viz., JJJ(T) was identified as a new species of Paracoccus by virtue of its explicitly low DNA-DNA hybridization (42-45%) with the type strain of the closest species P. versutus (), distinct G + C content (65.3 mol%), physiological and biochemical differences amounting to <60% phenetic similarity with strains of P. versutus as well as new isolates akin to the species. The newly described species also had a unique fatty acid profile that was distinguished by the absence of 18:1 omega9c, unique possession of Summed feature 3 (16:1omega7c & 15:0 iso 2-OH), 19:0 10 methyl, and a much higher concentration of 19:0 cycloomega8c.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Fabaceae / microbiology
  • Fatty Acids / analysis
  • Paracoccus / isolation & purification*
  • Paracoccus / metabolism
  • RNA, Ribosomal, 16S / analysis
  • Rhizome / microbiology
  • Sequence Homology, Nucleic Acid
  • Soil Microbiology
  • Sulfur / metabolism
  • Tetrathionic Acid / metabolism


  • Fatty Acids
  • RNA, Ribosomal, 16S
  • Sulfur
  • Tetrathionic Acid