Twenty recently obtained field isolates of Bradyrhizobium japonicum serogroup 123 were tested for their nodule mass production on the standard commercial soybean (Glycine max (L.) Merr. cv. Williams) and on two soybean plant introduction (PI) genotypes previously determined to restrict nodulation by strain USDA 123. Four of the field isolates showed similar restricted nodulation on the two genotypes, while all 20 isolates produced a normal amount of nodules on G. max cv. Williams. Serological analyses with adsorbed fluorescent antibodies showed that members of the 123 serotype ranked low in nodulation of the two PIs, in contrast to members of serotypes 127 and 129. Competition studies on the PIs indicated that isolates which were restricted were not competitive for nodule occupancy against strain USDA 110. However, unrestricted isolates of serogroup 123 were very competitive against USDA 110. On G. max cv. Williams, all serogroup 123 isolates tested were very competitive against USDA 110.
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机译：测试了最近获得的二十种日本根瘤菌血清群123的分离株在标准商品大豆（Glycine max（L.）Merr。cv。Williams）和先前确定限制结瘤的两种大豆植物导入（PI）基因型上的结节大量生产的能力。通过菌株USDA123。四个分离株在两个基因型上显示出相似的受限结瘤，而所有20个分离株在G. max cv上均产生正常数量的结节。威廉姆斯。用吸附的荧光抗体进行的血清学分析表明，与两种血清型127和129的成员相比，123种血清型的成员在两个PI的结节中排位低。对PI的竞争研究表明，受限制的分离株对结节占有率没有竞争性菌株USDA110。但是，不受限制的血清群123分离株与USDA 110的竞争非常激烈。威廉姆斯（Williams），所有经过测试的血清群123分离株都与美国农业部（USDA）110竞争激烈。
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