Rhizobia are Gram-negative bacteria that can exist either as free-living bacteria or as
nitrogen-fixing symbionts inside root nodules of leguminous plants. The composition of the …

Bacterial Pho regulons contain genes whose products are involved in the transport and
assimilation of inorganic phosphate. The expression of these genes is regulated by a …

Sinorhizobium meliloti is a soil bacterium capable of invading and establishing a symbiotic
relationship with alfalfa plants. This invasion process requires the synthesis, by S. meliloti, of …

Nitrogen (N2) fixation is one of the most important biological processes on earth, with a
commonly accepted estimate for global N2 fixation of 175 million metric tons (Tg) annually …

Seminal regulatory controls of microbial arsenite [As (III)] oxidation are described in this
study. Transposon mutagenesis of Agrobacterium tumefaciens identified genes essential for …

The global response to phosphate starvation was analysed at the transcriptional level in two
closely related strains of Sinorhizobium meliloti, Rm1021 and Rm2011. The Pho regulon is …

Characterization of nine transposon-induced mutants of Rhizobium tropici with decreased
salt tolerance (DST) allowed the identification of eight gene loci required for adaptation to …

The Pho regulon integrates the sensing of environmental inorganic phosphate (Pi)
availability with coregulation of gene expression, mediating an adaptive response to Pi …

Exopolysaccharide production by Sinorhizobium meliloti is required for invasion of root
nodules on alfalfa and successful establishment of a nitrogen-fixing symbiosis between the …

The properties and regulation of the pstSCAB-encoded Pi uptake system from the alfalfa
symbiont Sinorhizobium meliloti are reported. We present evidence that the pstSCAB genes …