This study investigated the distribution and genetic diversity of the indigenous Bradyrhizobium spp. in the Korean agricultural field. A total of 254 Bradyrhizobium strains were isolated from 97 soybean samples (9 cultivars) collected in 14 regions. B. elkanii dominated in the southern regions, while B. diazoefficiens dominated in most central and northern regions. Through non-parametric multidimensional scaling (NMDS) analysis, we confirmed the possibility that environmental factors such as annual average temperature and soybean cultivars might affect the distribution of Bradyrhizobium spp. in some regions. The DNA fingerprint using repetitive DNA sequences showed the genetic diversity among the Bradyrhizobium strains isolated from the different regions. Clustering the strains based on the genetic diversity indicated that Bradyrhizobium spp. grouped into different clusters depending on geographic location. This study suggests that the Korean indigenous Bradyrhizobium spp. distribute differently according to the geographical feature, and the high genetic diversity of each strain attribute to the geographic location.

中文翻译：

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慢生根瘤菌的地理分布和遗传多样性。从韩国大豆根瘤中分离

本研究调查了本土慢生根瘤菌属的分布和遗传多样性。在韩国农业领域。从14个地区采集的97份大豆样品（9个栽培品种）中，共分离出慢生根瘤菌254株。B. elkanii 在南部地区占优势，而 B. diazoefficiens 在大部分中部和北部地区占优势。通过非参数多维尺度（NMDS）分析，我们证实了年平均气温和大豆品种等环境因素可能影响慢生根瘤菌分布的可能性。在某些地区。使用重复 DNA 序列的 DNA 指纹显示了从不同区域分离的慢生根瘤菌菌株之间的遗传多样性。基于遗传多样性对菌株进行聚类表明慢生根瘤菌属。根据地理位置分为不同的集群。这项研究表明，韩国本土的慢生根瘤菌属。根据地理特征分布不同，每个菌株的高遗传多样性归因于地理位置。