By using modified Casse method the plasmids from several species ( strains ) of diazotrophs associated with rice plants, namely Alcaligenes fae-calis Al5, Enterobacter cloacae E26, E.

• 应用改进的Casse法提取质粒；鉴定了供试菌株的质粒存在情况:高NH_4~+和N_2培养的Alcaligenes faecalis A_15；Enterobacter cloacae E26；E.