| 中国东北和华北地区紫花苜蓿根瘤菌遗传多样性研究 | 
| 李昕芫,娄金秀,刘清源,胡健,张英俊 | 
| Genetic Diversity Analysis of Rhizobia Associated with Medicago sativa Cultivated in Northeast and North China | 
| LI XinYuan,LOU JinXiu,LIU QingYuan,HU Jian,ZHANG YingJun | 
| 图2 共生基因nodC(A)和nifH(B)的系统发育分析 | 
| Fig. 2 Neighbor-joining phylogenetic trees based on symbiotic gene nodC (A) and nifH (B) | 
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