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本文报道了从我国１５个省（区）分离的大豆三类共生体５４个菌株的部分生理生化特性及其变化的研究结果。菌株的世代时间测定表明，２６株快生菌株为２．６～４．７ｈｒ，１２株慢生菌株多数为８．５～１２．０ｈｒ，１６株超慢生菌株在１８．２～３９．６ｈｒ之间；改变碳源对代时有影响，但仍在各自的代时范围内，证明世代时间是大豆根瘤菌菌株间比较稳定的重要表型特征之一；在ＹＥＭ培养基上快生菌株产酸，超慢生菌株产碱能力比慢生菌株强，碳源不同使其产酸碱能力发生变化；三类共生体中都存在尿酶、硝酸还原酶、过氧化氢酶和β—半乳糖苷酶的活性，快生菌株这些酶活性较强，超慢生菌株较弱，慢生菌株基本介于二者中间。
This paper reports the partial physiological and biochemical characteristics of 54 strains of three symbionts isolated from 15 provinces (regions) in China and their changes. The determination of the generational times of the strains showed that 26 strains of fast-growing strains were 2.6-4.7hr, the majority of 12 strains of slow-growing strains were 8.5-12.0hr and the 16 strains of super-slow strains were 18.2-39.6hr ; Changing the carbon source has influence on the generation, but still in their generational range, which proves that the generation time is one of the most important phenotypic characteristics of the soybean rhizobia strains more stable; strains on the YEM medium The acidogenic and ultra-slow strains had stronger alkali-producing ability than the slow-growing strains and different carbon sources to make their acid-base-producing ability change. There were urease, nitrate reductase, catalase and β-galactose Glycosidase activity, fast-growing strains of these enzymes activity, ultra-slow strains weaker, slow-growing strains in between the two basic.