Applied and Environmental Microbiology, May 2002, p. 2555-2561, Vol. 68, No. 5
0099-2240/02/$04.00+0 DOI: 10.1128/AEM.68.5.2555-2561.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
Conservation of Plasmid-Encoded Traits among Bean-Nodulating Rhizobium Species
Susana Brom,1* Lourdes Girard,1 Alejandro García-de los Santos,1 Julio M. Sanjuan-Pinilla,2 José Olivares,2 and Juan Sanjuan2
Programa de Genética Molecular de Plásmidos Bacterianos, Centro de Investigación sobre Fijación de Nitrógeno, UNAM, Cuernavaca, Morelos, Mexico,1
Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, E-18008, Granada, Spain2
Received 11 October 2001/
Accepted 5 February 2002
Rhizobium etli type strain CFN42 contains six plasmids. We analyzed the distribution of genetic markers from some of these plasmids in bean-nodulating strains belonging to different species (Rhizobium etli, Rhizobium gallicum, Rhizobium giardinii, Rhizobium leguminosarum, and Sinorhizobium fredii). Our results indicate that independent of geographic origin, R. etli strains usually share not only the pSym plasmid but also other plasmids containing symbiosis-related genes, with a similar organization. In contrast, strains belonging to other bean-nodulating species seem to have acquired only the pSym plasmid from R. etli.
* Corresponding author. Mailing address: Centro de Investigación sobre Fijación de Nitrógeno, UNAM, Ap. P. 565-A, Cuernavaca, Morelos, Mexico. Phone: 52 (7773) 29 16 91 or 52 (7773) 17 58 67. Fax: 52 (7773) 17 55 81. E-mail: sbrom{at}cifn.unam.mx.
Applied and Environmental Microbiology, May 2002, p. 2555-2561, Vol. 68, No. 5
0099-2240/02/$04.00+0 DOI: 10.1128/AEM.68.5.2555-2561.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
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Copyright © 2002 by the American Society for Microbiology. All rights reserved.