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从同一稻田的紫云英根瘤上共分离到１５４株紫云英根瘤菌。将来自该田块１０株紫云英的１００株根瘤菌列为分析组Ａ；来自同一植株不同根瘤的４０株根瘤菌列为分析组Ｂ；来自植株两个根瘤的１４株根瘤菌列为分析组Ｃ。对所有菌株１０种抗生素的抗药性测定表明，分析组Ａ分为３９个不同抗药类群；分析组Ｂ分为２２个抗药类群。同一根瘤的分离株其抗药性也存在差异。质粒检测显示所有菌株都含有质粒，质粒数为１～５条；质粒分子量主要在８３ＭＤ至６００ＭＤ。质粒图谱分析表明，分析组Ａ分为８个质粒型，分析组Ｂ分为６个质粒型，同一根瘤分离株的质粒数并不完全一致。在所有分离株中，第２质粒型的菌株为优势菌群。
A total of 154 strains of Astragalus sinicus were isolated from root nodules of the same rice field. The 100 Rhizobium strains from 10 Astragalus adsurgens of the field were classified as analysis group A. Forty Rhizobia strains from different root nodules of the same plant were classified as analysis group B. The 14 Rhizobium strains from two plant nodules were classified as analysis Group C. Resistance analysis of 10 antibiotics to all strains showed that analysis group A was divided into 39 different drug resistance groups; analysis group B was divided into 22 drug resistance groups. Isolates of the same nodule also have differences in drug resistance. Plasmid detection showed that all the strains contained plasmids, the number of plasmids was 1 to 5; the molecular weight of the plasmids mainly ranged from 83MD to 600MD. Plasmid map analysis showed that analysis group A was divided into eight plasmid types, and analysis group B was divided into six plasmid types. The plasmid numbers of the same root nodule isolates were not exactly the same. Among all the isolates, the second plasmid type strain was the dominant strain.