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1Laboratoire de Microbiologie des Sols, ORSTOM BP 1386, Dakar, Senegal, West Africa
2Department of Applied Chemistry & Microbiology, University of Helsinki, PO Box 56, Biocentre 1, Viikinkaari 9, FIN-00014 Helsinki, Finland
3Laboratorium voor Microbiologie, Universiteit Gent, K.-L. Ledeganckstraat 35, B-9000 Ghent, Belgium
4Microbiology Department, Reading Laboratory, Institute of Food Research, Whiteknights Road, Reading RG6 6BZ, UK
5Escola Superior de Agricultura de Lavras, Caixa postal 37, CEP 37200-970, Lavras MG, Brazil
Author for correspondence: Monique Gillis. Tel: +32 9 264 5117. Fax: +32 9 264 5092. e-mail: Moniek.Gillis{at}rug.ac.be
ABSTRACT
A collection of strains isolated from root nodules of Acacia species in Senegal was analysed previously by electrophoresis of total cell protein, auxanographic tests, rRNA-DNA hybridization, 16S rRNA gene sequencing, DNA base composition and DNA-DNA hybridization [de Lajudie, P., Willems, A., Pot, B. & 7 other authors (1994). Int J Syst Bacteriol 44, 715–733]. Strains from Acacia were shown to belong to two groups, Sinorhizobium terangae, and a so-called gel electrophoretic cluster U, which also included some reference strains from Brazil. Further taxonomic characterization of this group using the same techniques plus repetitive extragenic palindromic-PCR and nodulation tests is presented in this paper. Reference strains from Sudan and a number of new rhizobia isolated from nodules of Acacia Senegal, Acacia tortilis subsp. raddiana and Prosopis juliflora in Senegal were included. As a result of this polyphasic approach, the creation of a new species, Mesorhizobium plurifarium, is proposed for a genotypically and phenotypically distinct group corresponding to the former cluster U and containing strains isolated from Acacia, Leucaena, Prosopis and Chamaecrista in West Africa (Senegal), East Africa (Sudan) and South America (Brazil). The type strain of Mesorhizobium plurifarium ORS 1032 has been deposited in the LMG collection as LMG 11892.
Key Words: tropical tree rhizobia • Acacia • Mesorhizobium plurifarium sp. nov. • polyphasic taxonomy
The EMBL accession numbers for the new sequence data are Y14158 for M. plurifarium LMG 11892T, Y14161 for W. plurifarium LMG 10056, Y14159 for M. loti LMG 6123 and Y14160 for M. loti LMG 6124.
Present address: LSTM ORSTOM/CIRAD-Forêt, Baillarguet, BP 5035, 34032 Montpellier Cedex 1, France.
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