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1 Laboratorium voor Microbiologie, Vakgroep Biochemie, Fysiologie, Microbiologie, Faculteit Wetenschappen, Universiteit Gent, Ledeganckstraat 35, B-9000 Belgium
2 Grupo de Ecología Genética, Estación Experimental del Zaidin, CSIC, E-18008, Granada, Spain
3 Centro de Investigación sobre Fijación de Nitrógeno, Universidad Nacional Autónoma de México, Ap. P. 565-A, Cuernavaca, Mexico
Correspondence
Anne Willems
anne.willems{at}ugent.be
A group of four diverse rhizobial isolates and two soil isolates that are highly related to Ensifer adhaerens were characterized by a polyphasic approach. On the basis of DNA–DNA hybridizations and phenotypic features, these strains cannot be distinguished clearly form Ensifer adhaerens, a soil bacterium that was described in 1982, mainly on the basis of phenotypic characteristics. Phylogenetically, Ensifer and Sinorhizobium form a single group in the 16S rDNA dendrogram of the 
-Proteobacteria, as well as in an analysis of partial recA gene sequences. They may therefore be regarded as a single genus. Because Sinorhizobium was proposed in 1988, according to the Bacteriological Code (1990 Revision) the older name, Ensifer, has priority. However, there are several reasons why a change from Sinorhizobium to Ensifer may not be the best solution and making an exception to Rule 38 may be more appropriate. We therefore propose the species Sinorhizobium adhaerens comb. nov. and put forward a Request for an Opinion to the Judicial Commission regarding the conservation of Sinorhizobium adhaerens over Ensifer adhaerens.
The GenBank/EMBL/DDBJ accession numbers for the new 16S rDNA sequences are AJ420773 (strain 5D19), AJ420774 (HAMBI 1631), AJ420775 (LMG 20582) and AJ420776 (LMG 20571) and for new recA gene sequences: AJ505595 (ATCC 33212T), AJ505596(LMG 20582), AJ505597 (5D19), AJ505598 (HAMBI 1631), AJ505599 (BR819), AJ505600 (BR8606) and AJ505601 (LMG 21331T).
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Judicial Commission of the International Committee The genus name Sinorhizobium Chen et al. 1988 is a later synonym of Ensifer Casida 1982 and is not conserved over the latter genus name, and the species name 'Sinorhizobium adhaerens' is not validly published. Opinion 84 Int J Syst Evol Microbiol, August 1, 2008; 58(8): 1973 - 1973. [Abstract] [Full Text] [PDF]
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J. M. Young The genus name Ensifer Casida 1982 takes priority over Sinorhizobium Chen et al. 1988, and Sinorhizobium morelense Wang et al. 2002 is a later synonym of Ensifer adhaerens Casida 1982. Is the combination 'Sinorhizobium adhaerens' (Casida 1982) Willems et al. 2003 legitimate? Request for an Opinion Int J Syst Evol Microbiol, November 1, 2003; 53(6): 2107 - 2110. [Abstract] [Full Text] [PDF]
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