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International Journal of Systematic and Evolutionary Microbiology, Vol 52, 1267-1276, Copyright © 2002 by Society for General Microbiology


Rhizobium sullae sp. nov. (formerly 'Rhizobium hedysari'), the root-nodule microsymbiont of Hedysarum coronarium L

A. Squartini, P. Struffi, H. Doring, S. Selenska-Pobell, E. Tola, A. Giacomini, E. Vendramin, E. Velazquez, P. F. Mateos, E. Martinez-Molina, F. B. Dazzo, S. Casella and M. P. Nuti
Dipartimento di Biotecnologie Agrarie, Universita di Padova, Agripolis, Strada Romea 16, 35020 Legnaro, Padova, Italy

This work is the completion of a series of reports describing the nitrogen-fixing bacterial symbionts of sulla (Hedysarum coronarium L., Leguminosae) and providing the grounds for their proposal as a new taxon. The introduction summarizes a large amount of previous evidence gathered on the physiology, genetics and ecology of such organisms, which have in the past been referred to provisionally as 'Rhizobium hedysari'. Upon adding 16S RNA sequencing, amplified rDNA restriction analysis of the rrn operon, DNA--DNA hybridization homology and analysis of low-molecular-mass RNA species, it is concluded that the group of strains that specifically nodulate sulla consists of a coherent set of isolates that differ from previously described rhizobia to an extent that warrants the constitution of the species boundary. The name Rhizobium sullae sp. nov. is proposed, with isolate IS123(T) (=USDA 4950(T) =DSM 14623(T)) as the type strain.


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