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- W3012912351 abstract "Abstract Background Phaseolus vulgaris (common bean) microsymbionts belonging to the bacterial genera Rhizobium , Bradyrhizobium , and Ensifer ( Sinorhizobium ) have been isolated across the globe. Individual symbiosis genes (e.g., nodC ) of these rhizobia can be different within each genus and among distinct genera. Little information is available about the symbiotic structure of indigenous Rhizobium strains nodulating introduced bean plants or the emergence of a symbiotic ability to associate with bean plants in Bradyrhizobium and Ensifer strains. Here, we sequenced the genomes of 29 representative bean microsymbionts (21 Rhizobium , four Ensifer , and four Bradyrhizobium ) and compared them with closely related reference strains to estimate the origins of symbiosis genes among these Chinese bean microsymbionts. Results Comparative genomics demonstrated horizontal gene transfer exclusively at the plasmid level, leading to expanded diversity of bean-nodulating Rhizobium strains. Analysis of vertically transferred genes uncovered 191 (out of the 2654) single-copy core genes with phylogenies strictly consistent with the taxonomic status of bacterial species, but none were found on symbiosis plasmids. A common symbiotic region was wholly conserved within the Rhizobium genus yet different from those of the other two genera. A single strain of Ensifer and two Bradyrhizobium strains shared similar gene content with soybean microsymbionts in both chromosomes and symbiotic regions. Conclusions The 19 native bean Rhizobium microsymbionts were assigned to four defined species and six putative novel species. The symbiosis genes of R . phaseoli , R . sophoriradicis , and R. esperanzae strains that originated from Mexican bean-nodulating strains were possibly introduced alongside bean seeds. R . anhuiense strains displayed distinct host ranges, indicating transition into bean microsymbionts. Among the six putative novel species exclusive to China, horizontal transfer of symbiosis genes suggested symbiosis with other indigenous legumes and loss of originally symbiotic regions or non-symbionts before the introduction of common bean into China. Genome data for Ensifer and Bradyrhizobium strains indicated symbiotic compatibility between microsymbionts of common bean and other hosts such as soybean." @default.
- W3012912351 created "2020-03-27" @default.
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- W3012912351 date "2020-02-27" @default.
- W3012912351 modified "2023-10-09" @default.
- W3012912351 title "Genomic insight into the origins and evolution of symbiosis genes in Phaseolus vulgaris microsymbionts" @default.
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- W3012912351 doi "https://doi.org/10.1186/s12864-020-6578-0" @default.
- W3012912351 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7047383" @default.
- W3012912351 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32106817" @default.
- W3012912351 hasPublicationYear "2020" @default.
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