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用数值分析法对５２株分离自四川、广东、江西的慢生花生根瘤菌和１２株参考菌株（５株为分类地位已知的慢生根瘤菌，７株为Ｂｒａｄｙｒｈｉｚｏｂｉｕｍｓｐ．）进行了１３１项表型性状的测定，并随机选取了部分菌株同慢生型大豆根瘤菌两个种的标准菌株（ＡＴＣＣ１０３２４Ｔ和ＵＳＤＡ７６Ｔ）进行了ＤＮＡ同源性测定。数值分类除３个菌株外，其余菌株在８２％相似性水平处聚为６个亚群，表现出了明显的多样性。从６个亚群中随机选取２０个菌株同Ｂ．ｊａｐｏｎｉｃｕｍ的标准菌株ＡＴＣＣ１０３２４Ｔ或Ｂ．ｅｌｋａｎｉ的标准菌株ＵＳＤＡ７６Ｔ进行ＤＮＡ杂交的结果表明：慢生型花生根瘤菌在分类上分别归属于Ｂ．ｊａｐｏｎｉｃｕｍ和Ｂ．ｅｌｋａｎｉ两个种。
A total of 52 strains of Bradyrhizobium japonicum isolated from Sichuan, Guangdong and Jiangxi Provinces and 12 reference strains (5 strains Bradyrhizobium sp. Having known taxa from Bradyrhizobium sp.) Were studied by numerical analysis. Type of traits and some strains were selected randomly with the slow-growing soybean rhizobium two strains of standard strains (ATCC10324T and USDA76T) for DNA homology determination. In addition to the three strains, the other strains clustered into six subgroups at the similarity level of 82%, showing obvious diversity. Twenty bacterial strains were randomly selected from the six subgroups. The standard strain of japonicum ATCC10324T or B. Elkani standard strain USDA76T DNA hybridization results show that: slow-growing peanut rhizobia belonging to the classification of B. japonicum and B. elkani two species.