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.

Physiological aspects, Nitrogen, Nitrogen fixation, Cytochromes

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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.

Genetic aspects, Soybean, Soybeans

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