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mesorhizobium amorphae, a rhizobial species that nodulates amorpha fruticosa, is native to american soils.amorpha fruticosa was inoculated with rhizosphere soil from iowa, usa, and 140 rhizobia isolated from root nodules were compared with mesorhizobium amorphae originating from chinese soils. pcr-rflp patterns of the 16s rrna gene from the isolates and from m. amorphaewere the same. all isolates had a symbiotic plasmid of the same size with a single nifhgene. dna:dna hybridization values, dna g+c content, and induced nod factor patterns also were similar. we concluded that the four genotypes distin ...200212209264
characteristics of the rhizobia associated with dalea spp. in the ordway, kellogg-weaver dunes, and hayden prairies.habitat fragmentation affects the biodiversity and function of aboveground organisms in natural ecosystems but has not been studied for effects on belowground species. in this paper, we consider the diversity of the rhizobia associated with the indigenous legume dalea purpurea in 3 residual prairie areas in minnesota and iowa. using dalea purpurea as a trap host, 218 rhizobia were recovered from these soils then characterized using boxa1r pcr. three major and 13 minor groups were distinguished b ...200515782230
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