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Correspondence
B. J. Tindall
bti{at}dsmz.de
ABSTRACT
The Judicial Commission affirms that the genus name Sinorhizobium Chen et al. 1988 is a later synonym of Ensifer Casida 1982, and that the former genus name is not conserved over the latter genus name. The species name ‘Sinorhizobium adhaerens’ is not validly published.
At its meetings in July 2005 at the IUMS Congress in San Francisco, the Judicial Commission of the International Committee on Systematics of Prokaryotes ruled on the Requests for an Opinion of Willems et al. (2003)
and Young (2003), both dealing with the synonymy of the genus names Sinorhizobium Chen et al. 1988 and Ensifer Casida 1982, together with the status of the proposed species name ‘Sinorhizobium adhaerens’ Willems et al. 2003.
The genus name Ensifer Casida 1982 has priority over the genus name Sinorhizobium Chen et al. 1988, and the two names have been shown by Willems et al. (2003) to be synonyms. It was generally felt that the transfer of the members of the genus Sinorhizobium to the genus Ensifer would not cause confusion and, therefore, the Judicial Commission denied the request to conserve the genus name Sinorhizobium Chen et al. 1988 over the genus name Ensifer Casida 1982. A direct result of this ruling is that the name ‘Sinorhizobium adhaerens’ Willems et al. 2003 is also not validly published, since it was proposed in anticipation of this Opinion. The Judicial Commission also noted that the Request for an Opinion of Willems et al. (2003) had not interpreted Principle 9 correctly. In this case, further taxonomic studies have shown that there is reason to consider the names Sinorhizobium Chen et al. 1988 and Ensifer Casida 1982 to be synonyms, and the Rules of the Bacteriological Code (Lapage et al., 1992) indicate that the principle of priority would result in the members of the genus Sinorhizobium being transferred to the genus Ensifer, as proposed by Young (2003).
REFERENCES
Lapage, S. P., Sneath, P. H. A., Lessel, E. F., Skerman, V. B. D., Seeliger, H. P. R. & Clark, W. A. (editors) (1992). International Code of Nomenclature of Bacteria (1990 Revision). Bacteriological Code. Washington, DC: American Society for Microbiology.
Willems, A., Fernández-López, M., Muñoz-Adelantado, E., Goris, J., De Vos, P., Martínez-Romero, E., Toro, N. & Gillis, M. (2003). Description of new Ensifer strains from nodules and proposal to transfer Ensifer adhaerens Casida 1982 to Sinorhizobium as Sinorhizobium adhaerens comb. nov. Request for an Opinion. Int J Syst Evol Microbiol 53, 1207–1217.
Young, J. M. (2003). 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 53, 2107–2110.
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