Enhanced nitrogen fixation in a Rhizobium etli ntrC mutant that overproduces the Bradyrhizobium japonicum symbiotic terminal oxidase cbb3

Article Abstract:

The cytochrome production pattern of a Rhizobium etli mutant with change affecting the ntr system was analyzed to determine whether nitrogen regulation affects respiration in R etli. Results showed that, in addition to oxygen regulation, NtrC represses the free-living cell production of the cbb3 symbiotic terminal oxidase. Analysis of cytochrome production revealed that in aerobic cultures, an ntrC mutant produced a terminal oxidase very similar to that produced in bacteroids, unlike the wild-type strain, indicating that nitrogen availability could modulate symbiotic cytochrome production in R etli.

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Evidence of horizontal transfer of symbiotic genes from a Bradyrhizobium japonicum inoculant strain to indigenous diazotrophs Sinorhizobium (Ensifer) fredii and Bradyrhizobium elkanii in a Brazilian Savannah soil

Article Abstract:

The parental strains and putative natural variants isolated from field-grown soybean nodules are characterized genetically in relation to conserved genes, nodulation and [N.sub.2]-fixation genes. The results have shown the strategies that bacteria might usually use to obtain ecological advantages, such as the acquisition of genes to establish effective symbioses with an exotic host legume.

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Genetic characterization of soybean rhizobia in Paraguay

Article Abstract:

Of 78 rhizobial isolates from soybean root nodules in Paraguay, most were Bradyrhizobium, Rhizobium, and Agrobacterium. Many were highly polymorphic and some might be native to Paraguay.

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