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mesorhizobium sangaii sp. nov., isolated from the root nodules of astragalus luteolus and astragalus ernestii.our previous published data indicated that the two rhizobial strains scau7(t) and scau27, which were isolated from the root nodules of astragalus luteolus and astragalus ernestii respectively, in sichuan province, china, might be novel species of the genus mesorhizobium. their exact taxonomic position was determined in the present study by using polyphasic approaches. comparative analysis of nearly full-length 16s rrna gene sequences showed that these strains belonged to the genus mesorhizobium, ...201323315406
horizontal gene transfer and recombination shape mesorhizobial populations in the gene center of the host plants astragalus luteolus and astragalus ernestii in sichuan, china.thirty-three rhizobial strains isolated from the root nodules of astragalus luteolus and astragalus ernestii growing on the west plateau at two different altitudes in sichuan province, china, were characterized by amplified rdna restriction analysis (ardra), amplified fragment length polymorphism (aflp), and by sequencing of rrs, glna, glnii and nifh. the ardra analysis revealed considerable genomic diversity. in aflp analysis, 20 of 33 astragalus rhizobia formed three distinct clades, with othe ...200919796139
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