美国农业科学家分离出一个日本根瘤菌（又称巴西根瘤菌）株系。用这种根瘤菌株接种大豆植株，可使其产生更多的根瘤，每株结瘤349个，每株结瘤湿重3．9克。对比之广，接种野生型根瘤菌株的大豆，每株仅结瘤159个，每株结瘤湿重仅2克。研究还表明，日本根瘤菌株可在培养中积累邻 American agricultural scientists isolated a Japanese Rhizobium (also known as Brazil Rhizobium) strains. Soybean plants were inoculated with this rhizobium strain to produce more nodules, with 349 nodules per plant and 3.9 g nodule wet weight per plant. In contrast, the wild-type rhizobium strain inoculated with only 159 nodules per plant had a nodule wet weight of only 2 grams per plant. Studies have also shown that Japanese rhizobium strains can accumulate neighbors in culture