Bioremediation using microorganisms is a promising technique to remediate soil contaminated with heavy metals. In this study, Rhodobacter sphaeroides was used to bioremediate soils contaminated with cadmium (Cd) and zinc (Zn). The study found that the treatment reduced the overall bioavailable fractions (e.g., exchangeable and carbonate bound phases) of Cd and Zn. More stable fractions (e.g., Fe-Mn oxide, organic bound, and residual phases (only for Zn)) increased after bioremediation. A wheat seedling experiment revealed that the phytoavailability of Cd was reduced after bioremediation using R. sphaeroides. After bioremediation, the exchangeable phases of Cd and Zn in soil were reduced by as much as 30.7% and 100.0%, respectively; the Cd levels in wheat leaf and root were reduced by as much as 62.3% and 47.2%, respectively. However, when the soils were contaminated with very high levels of Cd and Zn (Cd 54.97–65.33 mg kg⁻¹; Zn 813.4–964.8 mg kg⁻¹), bioremediation effects were not clear. The study also found that R. sphaeroides bioremediation in soil can enhance the Zn/Cd ratio in the harvested wheat leaf and root overall. This indicates potentially favorable application in agronomic practice and biofortification. Although remediation efficiency in highly contaminated soil was not significant, R. sphaeroides may be potentially and practically applied to the bioremediation of soils co-contaminated by Cd and Zn.

使用微生物进行生物修复是一种有望修复被重金属污染的土壤的技术。在这项研究中，球形红细菌被用于生物修复被镉（Cd）和锌（Zn）污染的土壤。研究发现，这种处理降低了Cd和Zn的总体生物利用度（例如，可交换的碳酸盐结合相）。生物修复后，更稳定的馏分（例如，Fe-Mn氧化物，有机键合和残留相（仅适用于Zn））增加。小麦幼苗实验表明，使用球形红球菌进行生物修复后，镉的植物利用率降低。。生物修复后，土壤中Cd和Zn的交换相分别减少了30.7％和100.0％。小麦叶片和根中的镉含量分别降低了62.3％和47.2％。但是，当土壤中的镉和锌含量很高时（镉54.97–65.33 mg kg ^-1；锌813.4–964.8 mg kg ^-1），生物修复作用尚不清楚。研究还发现，土壤中的球形球菌生物修复可以提高收获的小麦叶片和根部整体的锌/镉比。这表明在农业实践和生物强化中潜在的有利应用。尽管在高污染土壤中的修复效率并不显着，但是球形红球菌（R. sphaeroides） 可潜在地和实际地应用于被Cd和Zn共同污染的土壤的生物修复。