Erythrina brucei is a woody legume tree used as mulch, green manure and cover crop in conventional agroforestry practices. This paper explores genetic diversity and plant growth promoting traits of bacteria associated with nodules of E. brucei by trap culture method using 15 field soils. Only 67% of soil samples induced nodulation and 27 bacteria were isolated, in which 15 possessed nifH, 9 phosphate solubilizers and IAA producers and showed growth at 1.0–3.5% of NaCl. The ARDRA analysis revealed 12 clusters at 75% similarity level and distributed into 6 genera and 9 species. Species Bradyrhizobium cajani and Bradyrhizobium cytisi were observed for the first time in the nodules E. brucei. Genetically, functionally and phylogenetically diverse bacteria occur in the nodules of E. brucei. Isolate BU1 could be a potential bioinoculant candidate which can be used for the promotion of the host plant.

Erythrina brucei是一种木质豆科植物树，在常规农林业实践中用作覆盖物，绿肥和覆盖作物。本文利用15种田间土壤，采用诱集培养的方法，探讨了布鲁氏大肠杆菌结节相关细菌的遗传多样性和促进植物生长的特性。仅67％的土壤样品诱导结瘤并分离出27种细菌，其中15种具有nifH，9种磷酸盐增溶剂和IAA生产商，并在1.0％至3.5％的NaCl中生长。ARDRA分析揭示了12个簇，相似度为75％，并分为6属和9种。种大豆慢生cajani和慢生cytisi观察首次在结节E.布氏。在遗传，功能和系统发育上均存在于布鲁氏大肠杆菌的根瘤中。分离株BU1可能是潜在的生物抑制剂，可用于促进宿主植物。