Rhizobium strain A106L (a member of the A106 series) nodulating Astra-galus sinicus was taken as parent strain.

• 以紫云英根瘤菌A106L(A106菌系的一株)为出发菌株,在正常培养条件下得到的170个分离系中,有19个分离系对紫云英无结瘤能力;