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Remediation of vanadium contaminated soil by alfalfa (Medicago sativa L.) combined with vanadium-resistant bacterial strain
Environmental Technology & Innovation ( IF 7.1 ) Pub Date : 2020-08-06 , DOI: 10.1016/j.eti.2020.101090
Chun-dan Gan , Ting Chen , Jin-yan Yang

Vanadium (V) in soils exerts toxic effects on human health. To develop a plant–microorganism combined remediation strategy for V-contaminated soil, pot experiments were conducted with alfalfa (Medicago sativa L.) and V-resistant bacterial strain Arthrobacter sp. 5k4-8-1 in different levels of V-contaminated soil. At 500 mg kg1 spiked V(V), alfalfa survived only in the soils inoculated with high-level bacterial strain (1010 CFU mL1, 15 mL), indicating that strain 5k4-8-1 worked effectively on alleviating the stress of V on plant growth. Compared with non-inoculated controls, the V accumulation in alfalfa plants was increased conspicuously by inoculation of strain 5k4-8-1. After the remediation process by the combination of strain 5k4-8-1 and alfalfa, the proportion of V(V) in total V decreased in all soils, indicating that the strain may possess a mechanism of reducing V(V) to V(IV). Moreover, the strain 5k4-8-1 led to an obvious reduction of soil V bioavailability and mobility in inoculation treatments. These results provide insights into the plant–microorganism combined bioremediation of V-contaminated soil.



中文翻译:

苜蓿(Medicago sativa L.)联合抗钒细菌菌株对钒污染土壤的修复

土壤中的钒对人类健康产生毒性作用。为了开发针对V污染土壤的植物-微生物联合治理策略,用紫花苜蓿(苜蓿(Medicago sativa L.))和耐V细菌菌株节杆菌进行了盆栽试验。5k4-8-1在不同水平的V污染土壤中。在500毫克/公斤-1个掺入V(V)的苜蓿仅在接种了高水平细菌菌株(10 10 CFU mL-1个(15 mL),表明菌株5k4-8-1在缓解V对植物生长的胁迫方面有效地发挥了作用。与未接种的对照相比,通过接种5k4-8-1菌株,紫花苜蓿植物中的V积累显着增加。在5k4-8-1菌株和苜蓿的联合修复过程中,所有土壤中V(V)在总V中的比例均降低,表明该菌株可能具有将V(V)还原为V(IV)的机制。 )。此外,菌株5k4-8-1导致接种处理中土壤V的生物利用度和迁移率明显降低。这些结果提供了对V污染土壤的植物-微生物联合生物修复的见解。

更新日期:2020-08-28
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