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Journal of Bacteriology, November 1998, p. 6052-6053, Vol. 180, No. 22
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Three Replicons of Rhizobium sp. Strain NGR234 Harbor Symbiotic Gene Sequences

Margarita Flores,1 Patrick Mavingui,1 Lourdes Girard,1 Xavier Perret,2 William J. Broughton,2 Esperanza Martínez-Romero,1 Guillermo Dávila,1 and Rafael Palacios1,*

Centro de Investigación sobre Fijación de Nitrógeno, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, Mexico,1 and Laboratoire de Biologie Moléculaire des Plantes Supérieures, Université de Genève, 1292 Chambésy/Geneva, Switzerland2

Received 23 June 1998/Accepted 9 September 1998

Rhizobium sp. strain NGR234 contains three replicons: the symbiotic plasmid or pNGR234a, a megaplasmid (pNGR234b), and the chromosome. Symbiotic gene sequences not present in pNGR234a were analyzed by hybridization. DNA sequences homologous to the genes fixLJKNOPQGHIS were found on the chromosome, while sequences homologous to nodPQ and exoBDFLK were found on pNGR234b.

* Corresponding author. Mailing address: Centro de Investigación sobre Fijación de Nitrógeno, Universidad Nacional Autónoma de México, Ap. Postal 565-A, Cuernavaca, Morelos, Mexico. Phone and fax: (73) 114660. E-mail: palacios{at}cifn.unam.mx.

Journal of Bacteriology, November 1998, p. 6052-6053, Vol. 180, No. 22
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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