The results showed that all tested strains were clustered into phena at 7% similarity level. Phenon Ⅰ includes repre果表明：所有测试菌株在7％的相似性水平上分为三个表观群，群Ⅰ包括 株Sinorhizobiummeliloti的参比菌和9株新分离的内蒙古根瘤菌；