Genetic diversity and relationships among isolates of Rhizobium leguminosarum biovar phaseoli.

Applied and Environmental Microbiology
D PiñeroR K Selander

Abstract

Fifty-one isolates of Rhizobium leguminosarum biovar phaseoli from various geographic and ecological sources, largely in Mexico, were characterized by the electrophoretic mobilities of 15 metabolic enzymes, and 46 distinctive multilocus genotypes (electrophoretic types [ETs]) were distinguished on the basis of allele profiles at the enzyme loci. Mean genetic diversity per enzyme locus among the 46 ETs was 0.691, the highest value yet recorded for any species of bacterium. The occurrence of strong nonrandom associations of alleles over loci suggested a basically clonal population structure, reflecting infrequent recombination of chromosomal genes. Multilocus genotypic diversity was unusually high, with the most strongly differentiated pairs of ETs having distinctive alleles at all 15 loci and major clusters of ETs diverging at genetic distances as large as 0.89. This great diversity in the chromosomal genome raises the possibility that R. leguminosarum biovar phaseoli is a polyphyletic assemblage of strains. As other workers have suggested, the inclusion of all strains capable of nodulating beans in a single biovar or species is genetically unrealistic and taxonomically misleading. A biologically meaningful classification of Rhi...Continue Reading

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Citations

Mar 28, 2002·Applied and Environmental Microbiology·Matthew A Parker
Nov 5, 2005·Applied and Environmental Microbiology·Hong GuoJianping Xu
Apr 11, 2006·Canadian Journal of Microbiology·Frédéric Zakhia, Philippe de Lajudie
Jun 3, 2009·DNA and Cell Biology·Esperanza Martínez-Romero
Jan 6, 2010·Applied and Environmental Microbiology·Víctor GonzálezGuillermo Dávila
Jul 29, 2017·Genome Announcements·Rosa Isela SantamaríaVíctor González
Apr 27, 2002·Applied and Environmental Microbiology·Susana BromJuan Sanjuan
Sep 1, 1994·World Journal of Microbiology & Biotechnology·S PooyanD Borthakur
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Feb 1, 1996·Evolution; International Journal of Organic Evolution·Jill M SpoerkeMatthew A Parker
Mar 17, 2021·FEMS Microbiology Ecology·Ashenafi Hailu GunnaboJoost van Heerwaarden
Jun 1, 1995·Applied and Environmental Microbiology·S M LohrkeM J Sadowsky
Aug 1, 1995·Applied and Environmental Microbiology·J Caballero-MelladoE Martinez-Romero
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