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Int J Syst Evol Microbiol 59 (2009), 367-372; DOI  10.1099/ijs.0.000521-0
© 2009 International Union of Microbiological Societies

Rhizobium alamii sp. nov., an exopolysaccharide-producing species isolated from legume and non-legume rhizospheres

Odile Berge1,2,3, Asma Lodhi1,2,3,{dagger}, Géraldine Brandelet1,2,3, Catherine Santaella1,2,3, Marie-Anne Roncato1,2,3, Richard Christen4,5, Thierry Heulin1,2,3 and Wafa Achouak1,2,3

1 CEA, DSV, IBEB, SBVME, Laboratoire d'Écologie Microbienne de la Rhizosphère et d'Environnements Extrêmes (LEMiRE), F-13108 Saint-Paul-lez-Durance, France
2 CNRS, UMR 6191, F-13108 Saint-Paul-lez-Durance, France
3 Aix-Marseille Université, F-13108 Saint-Paul-lez-Durance, France
4 CNRS, UMR 6543, Laboratoire de Biologie Virtuelle, Parc Valrose, F-06108 Nice, France
5 Université de Nice, Parc Valrose, Centre de Biochimie, F-06108 Nice, France

Correspondence
Odile Berge
odile.berge{at}cea.fr

A group of exopolysaccharide-producing bacteria was isolated from the root environment of Arabidopsis thaliana. The genetic diversity revealed by REP-PCR fingerprinting indicated that the isolates correspond to different strains. 16S rRNA gene sequence analysis showed that the isolates are closely related to the strains Rhizobium sp. YAS34 and USDA 1920, respectively isolated from sunflower roots and Medicago ruthenica nodules. These bacteria belong to the Rhizobium lineage of the Alphaproteobacteria, and the closest known species was Rhizobium sullae. DNA–DNA hybridization experiments and biochemical analysis demonstrated that the nine strains isolated from A. thaliana and Rhizobium strains YAS34 and USDA 1920 constitute a novel species within the genus Rhizobium, for which the name Rhizobium alamii sp. nov. is proposed. The type strain is GBV016T (=CFBP 7146T =LMG 24466T).

Abbreviations: EPS, exopolysaccharide

{dagger}Present address: Nuclear Institute for Agriculture and Biology, PO Box 128, Jhang Road, Faisalabad 38000, Pakistan.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain GBV016T is AM931436.

A photograph of colonies of one of the novel strains showing EPS production and details of DNA–DNA hybridization results are available as supplementary material with the online version of this paper.






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