Lysogeny in Bradyrhizobium japonicum and its effect on soybean nodulation

Article Abstract:

Interactions of rhizobiophage V with Bradyrhizobium japonicum L4-4 suggests the possibility of lysogenization. To clarify this possibility, phage-resistant derivatives of L4-4 were generated and characterized. In addition, derivatives of phage V were developed. The results showed that the relationship between the different phage and bacterial strains is indeed lysogenic. Southern hybridizations confirmed the integration of the phage sequence within the bacterial genomes, which sometimes resulted in a nonnodulation phenotype. However, the hybridization patterns also showed that the phage sequences are not inserted in the known nodulation genes.

Bacteriophages, Nitrogen-fixing microorganisms, Lysogeny

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Plasmid transfer between spatially separated donor and recipient bacteria in earthworm-containing soil microcosms

Article Abstract:

Earthworm activity is unable to substantially influence the total number of donor and recipient bacteria recovered from soil as compared to that in microcosms devoid of earthworms. The depth of recovery of plasmid pJP4 depends on the burrowing behavior of the earthworm species Aporrectodea trapezoides, Lumbricus rubellus and Lumbricus terrestris. The feces of these species of earthworm contain donor and recipient bacteria. However, transconjugant bacteria is absent from these microhabitats.

Environmental aspects, Observations, Earthworms, Soil ecology

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Plasmids pJP4 and r68.45 can be transferred between populations of bradyrhizobia in nonsterile soil

Article Abstract:

Gene transfer among bradyrhizobium strains in nonsterile soil is reported. Acquisition of mercury resistance determines the transfer rates of plasmid pJP4 in nonsterile soil. The transfer rates of plasmid r68.45 in bulk and rhizophere soils are relatively higher. Plasmid transfer is not detected within soyabean nodules.

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