Biological nitrogen fixation in rhizobia occurs primarily in root or stem nodules and is
induced by the bacteria present in legume plants. This symbiotic process has fascinated …

This review presents a comparison between the complex genetic regulatory networks that
control nitrogen fixation in three representative rhizobial species, Rhizobium meliloti …

In addition to the most abundant sigma factor, both gram-negative and gram-positive
eubacteria employ alterna-tive sigma factors that confer different promoter specificities on …

Legumes form tripartite symbiotic associations with noduleinducing rhizobia and vesicular-
arbuscular mycorrhizal fungi. Co-inoculation of soybean (Glycine max [L.] Merr.) roots with …

Symbiotic nitrogen fixation is carried out in specialized organs, the nodules, whose
formation is induced on leguminous host plants by bacteria belonging to the family …

Experiments using plasmid-borne gene fusions and direct RNA measurements have
revealed that expression from the nifA gene is induced in Rhizobium meliloti when the …

This report is concerned with the structural characterization and genetic regulation of new
bacterial groES and groEL chaperonin genes, and presents two novelties. The first is the …

Recognition of-24/-12-type promoters by RNA polymerase requires a special sigma factor,
sigma 54 (RpoN NtrA GlnF). In the nitrogen-fixing soybean symbiont Bradyrhizobium …

Rhizobium and Bradyrhizobium have attracted great attention due to their capacity to
establish a symbiosis with the roots of legumes, resulting in the reduction of atmospheric …

A new bacterial promoter type has been identified in the last few years. Originally
designated as nif (= ni trogen f ixation) or ntr (= nit rogen r egulation) consensus promoter, it …