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Ramlibacter tataouinensis gen. nov., sp. nov., and Ramlibacter henchirensis sp. nov., cyst-producing bacteria isolated from subdesert soil in Tunisia

Thierry Heulin¹, Mohamed Barakat¹, Richard Christen², Maurice Lesourd³, Laurent Sutra^4,, Gilles De Luca¹ and Wafa Achouak¹

¹ CEA/Cadarache, DSV-DEVM, Laboratoire d'Ecologie Microbienne de la Rhizosphère UMR 163 CNRS-CEA–Univ. Méditerranée, F-13108 Saint-Paul-lez-Durance, France
² UMR 6078 CNRS–Université de Nice Sophia-Antipolis, Bât. Jean Maetz, F-06230 Villefranche-sur-mer, France
³ Service Commun de Microscopie Electronique, CNRS & Université d'Angers, rue Haute de Reculée, F-49045 Angers, France
⁴ UMR 077 de Pathologie Végétale, INRA-INH-Université d'Angers, 42 rue Georges-Morel, BP 57, F-49071 Beaucouzé Cedex, France

Correspondence
Thierry Heulin
thierry.heulin{at}cea.fr

Ramlibacter gen. nov. is proposed for two aerobic, chemo-organotrophic, cyst-producing soil bacterial strains. These bacteria are Gram-negative, non-flagellated rods or cysts, isolated from subdesert soil in Tataouine, Tunisia. Phylogenetic analyses of the rrs sequences of the two strains showed that they do not constitute a robust clade at the genus level with any previously described bacteria and that they are a deep branch of a clade also grouping the genera Acidovorax and Hydrogenophaga within the -Proteobacteria. They belong to two different species, as verified by DNA–DNA hybridization (23·5 % reassociation). The type species of the genus is Ramlibacter tataouinensis sp. nov., with the type strain TTB310^T (=DSM 14655^T =ATCC BAA-407^T =LMG 21543^T). The second species is Ramlibacter henchirensis sp. nov., with the type strain TMB834^T (=DSM 14656^T =ATCC BAA-408^T =LMG 21542^T). The G+C contents of R. tataouinensis and R. henchirensis are 69·6 and 66·6 mol%, respectively.

Published online ahead of print on 23 August 2002 as DOI 10.1099/ijs.0.02482-0.

The GenBank/EMBL accession numbers for the rrs sequences of Ramlibacter tataouinensis strain TTB310^T and Ramlibacter henchirensis strain TMB834^T are AF144383 and AF439400, respectively.

Deceased 16 December 2002; this paper is dedicated to his memory.

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