The supply of K, being the chemical analog of Cs, affects the phytotransfer of radiocesium such as ¹³⁷Cs from contaminated soils and its accumulation in plant tissues. Since K and Cs have high affinity to the same clay particle surfaces, the presence of potassium-solubilizing bacteria (KSB) could increase the availability of not only K⁺ in the rhizosphere but also of radiocesium. In this study, we obtained five KSB isolates with the highest solubilization capacities from soybean rhizosphere on modified Aleksandrov medium containing sericite as K source. Based on biochemical and 16S rRNA gene sequence analysis, we identified the bacteria as Bacillus aryabhattai MG774424, Pseudomonas umsongensis MG774425, P. frederiksbergensis MG774426, Burkholderia sabiae MG774427, and P. mandelii MG774428. We evaluated the KSB isolates based on plant growth promotion and ¹³⁷Cs accumulation in komatsuna (Brassica rapa L. var. Perviridis) grown in three soils collected from Miyanoiri, Takanishi, and Ota contaminated by ¹³⁷Cs from the Fukushima accident. Inoculation with KSB showed beneficial effects on plant growth and increased the overall plant biomass production (~40%). On the average, KSB inoculation resulted in the removal of 0.07 ± 0.04% of ¹³⁷Cs from the soil, more than twice the control. But similar to the effect of KSB inoculation on komatsuna biomass production, different KSBs performed variably and exhibited site-specific responses independent of their K-solubilizing capacities, with higher ¹³⁷Cs phyto-transfer in roots than in shoots. In terms of root transfer factor (TF), values were highest in komatsuna plants grown in Miyanoiri and Ota soils inoculated with P. frederiksbergensis and Burkholderia sabiae, while they were highest in Takanishi soils inoculated with Bacillus aryabhattai and P. umsongensis. These TF values were also much higher than previously reported values for komatsuna grown in ¹³⁷Cs-contaminated Fukushima soils inoculated with other rhizobacteria. Thus, KSB inoculation significantly enhance not only the growth of komatsuna but ¹³⁷Cs uptake.

作为 Cs 的化学类似物的 K 的供应会影响放射性铯（例如¹³⁷ Cs）从受污染土壤中的植物转移及其在植物组织中的积累。由于 K 和 Cs 对相同的粘土颗粒表面具有高亲和力，钾溶解细菌 (KSB) 的存在不仅可以增加根际K ⁺的可用性，还可以增加放射性铯的可用性。在这项研究中，我们在含有绢云母作为钾源的改良 Aleksandrov 培养基上从大豆根际中获得了五种具有最高增溶能力的 KSB 分离株。基于生化和16S rRNA基因序列分析，我们将细菌鉴定为Bacillus aryabhattai MG774424、Pseudomonas umsongensis MG774425、P. frederiksbergensis MG774426、Burkholderia sabiae MG774427 和P. mandelii MG774428。我们基于植物生长促进和¹³⁷ Cs 在 komatsuna ( Brassica rapa L. var. Perviridis ) 中的¹³⁷ Cs 积累来评估 KSB 分离株，这些土壤生长在从被福岛事故中的¹³⁷ Cs污染的 Miyanoiri、Takanishi 和 Ota 收集的三种土壤中。接种 KSB 显示出对植物生长的有益影响，并增加了整体植物生物量产量 (~40%)。平均而言，KSB 接种导致¹³⁷来自土壤的Cs，是对照的两倍多。但类似于 KSB 接种对小松生物质生产的影响，不同的 KSB 表现不同，表现出独立于它们的钾溶解能力的位点特异性反应，根中的¹³⁷ Cs 植物转移高于芽中。在根转移因子 (TF) 方面，在接种了P. frederiksbergensis和Burkholderia sabiae 的 Miyanoiri 和 Ota 土壤中生长的小松植物中的值最高，而在接种了Bacillus aryabhattai和P. umsongensis 的Takanishi 土壤中的值最高。这些 TF 值也远高于先前报道的^{137 年}小松菜的值接种其他根际细菌的 Cs 污染的福岛土壤。因此，KSB 接种不仅显着增强了小松菜的生长，而且显着增强了¹³⁷ Cs 的吸收。