Higher diversity of Rhizobium leguminosarum biovar viciae populations in arable soils than in grass soils

Article Abstract:

Research has been conducted on the bacterial genetic diversity after long-term cultivation and under permanent grassland. Results indicate that rhizobial diversity can be affected by these management regimens.

United Kingdom, Statistical Data Included, Analysis, Genotype, Genotypes, Microbiological research

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Phylogenetic position of Rhizobium sp. strain Or 191, a symbiont of both Medicago sativa and Phaseolus vulgaris, based on partial sequences of the 16S rRNA and nifH genes

Article Abstract:

Rhizobium sp. strain Or 191 is a representatve strain of Rhizobium isolates collected from Oregon which cannodulate both alfalfa and common bean. To determine the phylogenetic status of this strain, the sequences of the 16S rRNA gene and the nifH gene were comparedto those of other Rhizobium species. The results showed that Or 191 is phylogenetically distinct, and is most closely related to a previously unrecognized taxonomic group referred to as type I strains. The results indicate that a reevaluation of the taxonomic status of several Rhizobium species and strains is needed.

Identification and classification, Microbiology, Taxonomy (Biology), Phylogeny

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Distribution of symbiotic genotypes in Rhizobium leguminosarum biovar viciae populations isolated directly from soils

Article Abstract:

The symbiotic (Sym) plasmid gene types are randomly distributed in the background genotypes of Rhizobium leguminosarum biovar viciae isolated from the soil. This indicates that there is no restriction on the transfer of the Sym plasmids in the soil populations. The same background genotype can consist of different Sym gene types. Similarly, identical Sym gene types may be present in different background genotypes.

Observations, Soil microbiology

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