根际
环境修复
EDDS公司
微生物种群生物学
生物修复
环境化学
微生物
土壤污染
植物修复
生物量(生态学)
生物利用度
农学
有益生物体
化学
生物
细菌
土壤水分
生态学
污染
重金属
遗传学
生物信息学
作者
Haixiang Zhang,Kailu Zhang,Yuhua Duan,Xiao Sun,Lijin Lin,Qianli An,Muhammad Mohsin Altaf,Zhiqiang Zhu,Fan Liu,Yangqiu Jiao,Jing Yin,Can Xie,Baijie Wang,Huiping Feng,Xin Zhang,Lixin Dong
标识
DOI:10.1016/j.jhazmat.2023.133266
摘要
The negative impacts of soil heavy metals composite pollution on agricultural production and human health are becoming increasingly prevalent. The applications of green chelating agents and microorganisms have emerged as promising alternate methods for enhancing phytoremediation. The regulatory effects of root secretion composition, microbial carbon source utilization, key gene expression, and soil microbial community structure were comprehensively analyzed through a combination of HPLC, Biolog EcoPlates, qPCR, and high-throughput screening techniques. The application of EDDS resulted in a favorable rhizosphere ecological environment for the king grass Piriformospora indica, characterized by a decrease in soil pH by 0.41 units, stimulation of succinic acid and fumaric acid secretion, and an increase in carbon source metabolic activity of amino acids and carbohydrates. Consequently, this improvement enhanced the bioavailability of Cd/Cr and increased the biomass of king grass by 25.7%. The expression of dissimilatory iron-reducing bacteria was significantly upregulated by 99.2%, while there was no significant difference in Clostridium abundance. Furthermore, the richness of the soil rhizosphere fungal community (Ascomycota: 45.8%, Rozellomycota: 16.7%) significantly increased to regulate the proportion of tolerant microbial dominant groups, promoting the improvement of Cd/Cr removal efficiency (Cd: 23.4%, Cr: 18.7%). These findings provide a theoretical basis for the sustainable development of chelating agent-assisted plants-microorganisms combined remediation of heavy metals in soil. The combined pollution of heavy metals in soil has more and more negative effects on agricultural production, food safety and human health. However, there are few reports on the bioremediation of Cd-Cr co-contaminated soil by the green chelating agent EDDS coupled with king grass-P. indica at multiple technical levels. This study shows that EDDS can enhance the remediation efficiency of king grass-P. indica on Cd-Cr moderately contaminated soil. We deeply analyzed the regulation mechanism of root organic acid composition, carbon source utilization efficiency, dissimilatory iron reducing bacteria expression, rhizosphere microbial dominant flora succession and soil environment.
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