RHIZOBIA PHYLOGENETICALLY RELATED TO COMMON BEAN SYMBIONTS RHIZOBIUM GIARDINII AND R. TROPICI ISOLATED FROM PEANUT NODULES IN CENTRAL ARGENTINA

IBAÑEZ,F.; TAURIAN,T.; ANGELINI,J.; TONELLI, M.L.; FABRA, A.

SOIL BIOLOGY AND BIOCHEMISTRY

Año: 2008 vol. 40 p. 537 - 539

0038-0717

Abstract In previous works, we examined the native rhizobial population associated with peanut nodules in Córdoba soils, Argentina. These studies 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 R. giardinii bv. giardinii strain H152, respectively. In this work we further characterize these isolates by performing an analysis of glnA and nifH genes, in order 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 previously described as efficiently nodulated exclusively by slow growing rhizobial strains