Rhizobia phylogenetically related to common bean symbionts Rhizobium giardinii and Rhizobium tropici isolated from peanut nodules in Central Argentina

Our previous studies of the native rhizobial population associated with peanut nodules in the Córdoba soils of Argentina revealed that this population is highly diverse and includes slow- and fast-growing isolates. The native fast-growing isolates NCHA22 and NET30 were selected on the basis of their...

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Bibliographic Details
Published in:Soil biology & biochemistry 2008-02, Vol.40 (2), p.537-539
Main Authors: Ibañez, Fernando, Taurian, Tania, Angelini, Jorge, Tonelli, Maria Laura, Fabra, Adriana
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Arachis hypogaea
Bacteria
Biochemistry and biology
Biological and medical sciences
Chemical, physicochemical, biochemical and biological properties
Economic plant physiology
Fundamental and applied biological sciences. Psychology
genes
genetic markers
Glutamine syntethase gene glnA
indigenous species
Microbiology
Native peanut rhizobia
nitrogen fixation
Nitrogen fixation gene nifH
nitrogen-fixing bacteria
peanuts
Phaseolus vulgaris
phylogeny
Physics, chemistry, biochemistry and biology of agricultural and forest soils
Rhizobial diversity
Rhizobium
Rhizobium giardinii bv. giardinii
Rhizobium tropici
ribosomal DNA
sequence analysis
Soil science
symbionts
Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)
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Summary:Our previous studies of the native rhizobial population associated with peanut nodules in the Córdoba soils of Argentina revealed that this population is highly diverse and includes slow- and fast-growing isolates. The native fast-growing isolates NCHA22 and NET30 were selected on the basis of their plant growth promoting properties and their chromosomal genotypes were determined by 16S rDNA sequencing. NCHA22 and NET30 16S rDNA alleles were found to cluster with those of Rhizobium tropici group IIB and Rhizobium giardinii bv. giardinii strain H152, respectively. We have now characterized these isolates by analyzing the glnA and nifH genes to clarify their taxonomic position. These studies confirmed that fast-growing isolates belonging to species earlier described as bean symbionts were obtained from nodules of a leguminous plant that has been described as efficiently nodulated exclusively by slow-growing rhizobial strains.
ISSN:0038-0717
1879-3428
DOI:10.1016/j.soilbio.2007.08.017