【摘要】 选用23株分离自山西、内蒙古、宁夏、甘肃和吉林的黄芪根瘤菌菌株，进行了营养利用、抗生素抗性、耐逆性和酶活性测定，发现不同地区来源、甚至同一地区来源或同种寄主的不同菌株存在着较大的差异，这种不一致现象在来源于甘肃的7株菌中尤为明显，特别是G156、G130和GO13在碳源利用能力方面表现出诸多不同于本多数黄芪根瘤菌的特点。G156、G012和G022能在50℃生长。多数被试菌株在pH11的条件下生长，少数菌株耐4％～5％NaCl，这些结果均说明黄芪根瘤菌是一个极其多样化的类群，它们也明显不同于已知根瘤菌。更多还原

【Abstract】 Twenty-three strains isolated from Astragalus spp.,distributed in Shanxi,Ningxia,Neimonggu,Gansu andJilin,provinces ware analysed by a series of tests for nutrient utilization, resistanee to antibiotics, endurane to salt, alkali and extreme temperatures, and enZyme activities’ The results showed the hug diversity of rhizobia isolated from Astragalus spp- distributed in different places.Some strains grow at 50℃, some grow in medium with 4% 5% NaCl or with pH 11, They could resist the extram environments.更多还原