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1Laboratoire de Microbiologie des Sols, ORSTOM BP 1386, Dakar, Senegal, West Africa
2Laboratorium voor Microbiologie, Universiteit Gent, B-9000 Ghent, Belgium
3Microbiology Department, Reading Laboratory, Agricultural and Food Research Council Institute of Food Research, Earley Gate, Reading, RG6 2EF, United Kingdom
* Corresponding author. Mailing address: Laboratorium voor Microbiologie, Universiteit Gent, K.-L. Ledeganckstraat, 35, B-9000 Ghent, Belgium. Phone: 32 9 264 5117. Fax: 32 9 264 5346. Electronic mail address: Moniek.Gillis{at}rug.ac.be.
ABSTRACT
A total of 80 bacterial strains isolated from different Sesbania and Acacia species growing in various sites in Senegal (West Africa) were compared with 35 reference strains of Rhizobium, Bradyrhizobium, Azorhizobium, and Agrobacterium species and with 33 representative strains of the different groups of Brazilian isolates described on the basis of the results of a numerical analysis of the whole-cell protein patterns obtained by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Fifty-two strains could be placed in three protein electrophoretic clusters, two of which were different from the clusters containing various reference or representative strains, while 30 other strains could not be placed in any group. The strains belonging to the three clusters were studied by determining their nodulation host ranges and their morphological, physiological, and auxanographic characteristics. Representative strains of the three clusters were also genotypically characterized by determining their DNA base compositions, by performing DNA-DNA and DNA-rRNA hybridization experiments, and by determining their 16S rRNA gene sequences. Our results showed that two of the clusters identified on the basis of SDS-PAGE data are genotypically and phenotypically distinct groups that belong on the Rhizobium meliloti-Rhizobium fredii rRNA branch. The third cluster is localized on the Rhizobium loti rRNA branch in the vicinity of Rhizobium huakuii and contains strains isolated in Africa, in Brazil, and in New Zealand from different leguminous species. On the basis of the results of the present study, we propose to emend the genus Sinorhizobium and to reclassify R. meliloti as Sinorhizobium meliloti comb. nov. In addition, two new species, Sinorhizobium saheli and Sinorhizobium teranga, are proposed for isolates from Senegal.
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