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Appl. Environ. Microbiol., Jul 1995, 2649-2653, Vol 61, No. 7
Copyright © 1995, American Society for Microbiology

Variability among Rhizobium Strains Originating from Nodules of Vicia faba

P van Berkum, D Beyene, FT Vera and HH Keyser
Soybean and Alfalfa Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Maryland 20705; Holetta Agricultural Research Center, Institute of Agricultural Research, Addis Ababa, Ethiopia; Servicio de Investigacion Agraria, DGIEA, Junta de Andalucia, Estacion Experimental La Rinconada, San Jose de la Rinconada, Seville, Spain; and NifTAL Project, University of Hawaii, Paia, Hawaii 96779

Rhizobium strains from nodules of Vicia faba were diverse in plasmid content and serology. Results of multilocus gel electrophoresis and restriction fragment length polymorphism indicated several deep chromosomal lineages among the strains. Linkage disequilibrium among the chromosomal types was detected and may have reflected variation of Rhizobium strains in the different geographical locations from which the strains originated. An investigation of pea strains with antibodies prepared against fava bean strains and restriction fragment length polymorphism analyses, targeting DNA regions coding for rRNA and nodulation, indicated that Rhizobium strains from V. faba nodules were distinguishable from those from Pisum sativum, V. villosa, and Trifolium spp.

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