| Autor: |
El Sharkawy M; 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., Al-Huqail AA; Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia., Aljuaid AM; Biology Department, College of Science and Humanities, Shaqra University, Shaqra 15571, Saudi Arabia., Kamal N; Soil and Water Department, Faculty of Agriculture, Tanta University, Tanta 31511, Egypt., Mahmoud E; Soil and Water Department, Faculty of Agriculture, Tanta University, Tanta 31511, Egypt., Omara AE; Agricultural Research Center, Department of Microbiology, Soils, Water and Environment Research Institute, Giza 12112, Egypt., El-Kader NA; Soil and Water Department, Faculty of Agriculture, Tanta University, Tanta 31511, Egypt., Li J; School of the Environment and Safety Engineering, School of Emergency Management, Jiangsu University, Zhenjiang 212013, China., Mahmoud NN; Department of Botany and Microbiology, Faculty of Science, Al-Azhar University, Nasr City, Cairo 11884, Egypt., El Baroudy AA; Soil and Water Department, Faculty of Agriculture, Tanta University, Tanta 31511, Egypt., Ghoneim AM; Agricultural Research Center, Field Crops Research Institute, Cairo 12619, Egypt., Ismail SM; Soil Physics and Chemistry Department, Desert Research Center, Cairo 11753, Egypt. |
| Abstrakt: |
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 Rhizobim nepotum strain (B 1 ), a bacterial Glutamicibacter halophytocola strain (B 2 ), 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 -1 ). 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 R. nepotum and G. halophytocola 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 R. nepotum and G. halophytocola 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 G. halophytocola 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. |
