1982年从辽宁省铁岭地区的风沙干旱盐碱地区的野生大豆(Glycine soja) 根瘤中分离得到一个大豆根瘤菌的新类群——超慢型大豆根瘤菌。此类群与快生型和慢生型大豆根瘤菌一样,在栽培大豆上结瘤良好,并能固氮。但不在草木樨、豌豆、紫云英、百脉根等豆科植物上结瘤,可在绿豆上结瘤并能测出固氮酶活性。生理生化特性上有许多特性与另外两群有较大差异,已进行的初步鉴定表明,主要表现在:(1)菌落如针尖大小,直径≤1mm:(2)在根瘤菌标准培养基上产碱能力强。据对超慢型12个菌株液体培养,生长5天pH达7.72～8.09,而所测定的慢生型大 In 1982, a new taxa of soybean rhizobia was isolated from the root nodules of Glycine soja in arid saline - alkali region of Tieling, Liaoning Province. These groups, like fast-growing and slow-growing soybean rhizobia, are well-nodulated and nitrogen-fixing on cultivated soybean. But not in the konjac, peas, aspartame, Lotus root and other legumes nodulation, nodulation in mung beans and can be measured nitrogenase activity. There are many physiological and biochemical characteristics of the other two groups are quite different, the initial identification has been conducted, the main manifestations are: (1) colony such as the tip size, diameter ≤ 1mm: (2) Rhizobium standard medium production Alkaline ability. According to the 12 strains of super slow liquid culture, growth of 5 days pH of 7.72 ~ 8.09, and the measured slow-type large