El Sharkawy Mahmoud, Al-Huqail Arwa A, Aljuaid Alya M, Kamal Nourhan, Mahmoud Esawy, Omara Alaa El-Dein, El-Kader Nasser Abd, Li Jian, Mahmoud Nashaat N, El Baroudy Ahmed A, Ghoneim Adel M, Ismail Sahar Mohamed
School of the Environment and Safety Engineering, School of Emergency Management, Jiangsu University, Zhenjiang 212013, China.
Soil and Water Department, Faculty of Agriculture, Tanta University, Tanta 31511, Egypt.
Nanomaterials (Basel). 2024 Jul 8;14(13):1164. doi: 10.3390/nano14131164.
Arsenic (As)-contaminated soil reduces soil quality and leads to soil degradation, and traditional remediation strategies are expensive or typically produce hazardous by-products that have negative impacts on ecosystems. Therefore, this investigation attempts to assess the impact of As-tolerant bacterial isolates via a bacterial strain (B), a bacterial (B), and MgO-NPs (N) and their combinations on the arsenic content, biological activity, and growth characteristics of maize plants cultivated in highly As-contaminated soil (300 mg As Kg). The results indicated that the spectroscopic characterization of MgO-NPs contained functional groups (e.g., Mg-O, OH, and Si-O-Si) and possessed a large surface area. Under As stress, its addition boosted the growth of plants, biomass, and chlorophyll levels while decreasing As uptake. Co-inoculation of and had the highest significant values for chlorophyll content, soil organic matter (SOM), microbial biomass (MBC), dehydrogenase activity (DHA), and total number of bacteria compared to other treatments, which played an essential role in increasing maize growth. The addition of and alone or in combination with MgO-NPs significantly decreased As uptake and increased the biological activity and growth characteristics of maize plants cultivated in highly arsenic-contaminated soil. Considering the results of this investigation, the combination of with MgO-NPs can be used as a nanobioremediation strategy for remediating severely arsenic-contaminated soil and also improving the biological activity and growth parameters of maize plants.
受砷污染的土壤会降低土壤质量并导致土壤退化，而传统的修复策略成本高昂，且通常会产生对生态系统有负面影响的有害副产品。因此，本研究试图评估耐砷细菌分离株通过菌株（B）、细菌（B）和氧化镁纳米颗粒（N）及其组合对种植在高砷污染土壤（300毫克砷/千克）中的玉米植株的砷含量、生物活性和生长特性的影响。结果表明，氧化镁纳米颗粒的光谱表征包含官能团（如Mg-O、OH和Si-O-Si）且具有较大的表面积。在砷胁迫下，添加氧化镁纳米颗粒可促进植物生长、增加生物量和叶绿素水平，同时减少砷的吸收。与其他处理相比，B和N共同接种对叶绿素含量、土壤有机质（SOM）、微生物生物量（MBC）、脱氢酶活性（DHA）和细菌总数具有最高的显著值，这对促进玉米生长起着至关重要的作用。单独添加B和N或与氧化镁纳米颗粒组合添加，均可显著降低砷的吸收，并提高种植在高砷污染土壤中的玉米植株的生物活性和生长特性。考虑到本研究结果，B与氧化镁纳米颗粒的组合可作为一种纳米生物修复策略，用于修复严重砷污染的土壤，并改善玉米植株的生物活性和生长参数。
