Rapid in situ evolution of nodulating strains for Biserrula pelecinus L. through lateral transfer of a symbiosis island from the original mesorhizobial inoculant

Article Abstract:

A study aims to determine whether there is in situ transfer of symbiotic genes from WSM1271 to four diverse strains (N17, N18, N45, and N87) isolated in 2000 from nodules on Biserrula pelecinus growing at the Northam site. Findings reveal that the diverse and ineffective strains isolated in Northam, Western Australia that are able to nodulate B. pelecinus evolved through in situ transfer of symbiotic genes on a symbiosis island from WSM1271 to resident soil bacteria.

Soil microbiology, Transfer RNA, Structure, Report

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Identification of Sinorhizobium meliloti early symbiotic genes by use of a positive functional screen

Article Abstract:

A positive functional screen of the entire genome for symbiotic genes is carried out using a modified in vivo expression Sinorhizobium meliloti technology. Sinorhizobium meliloti genes suggest that the interactions in the early stages of the Sinorhizobium meliloti and alfaalfa symbiosis could be complex and that further characterization of these genes will lead to a better understanding of the symbiosis.

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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.

Analysis, Polymerase chain reaction, Nucleotide sequencing

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