Enhanced phytoremediation of cadmium-contaminated soil using chelating agents and plant growth regulators: effect and mechanism

The heavy metal cadmium (Cd) is a major threat to food safety and human health. Phytoremediation is the most widely used remediation technology, and how to improve the remediation efficiency of phytoremediation has become a key issue. In this study, we constructed an intensive phytoremediation techn...

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Bibliographic Details
Published in:Royal Society open science 2024-09, Vol.11 (9), p.240672-20
Main Authors: Yang, Qiao, Yu, Hao, Yang, Chen, Zhao, Zhongqiu, Ju, Zhengshan, Wang, Jinman, Bai, Zhongke
Format: Article
Language:English
Subjects:
Acids
Antioxidants
Biomass
Cadmium
Chelating agents
Chelation
Chemistry
Efficiency
Enzymes
Growth regulators
Heavy metals
Loam soils
microbial communities
Moisture content
Physiology
Phytoremediation
plant extraction
Plant growth
plant growth regulator
Plant resistance
Pollution
Potassium
Soil contamination
Soil microorganisms
Soil pollution
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Summary:The heavy metal cadmium (Cd) is a major threat to food safety and human health. Phytoremediation is the most widely used remediation technology, and how to improve the remediation efficiency of phytoremediation has become a key issue. In this study, we constructed an intensive phytoremediation technology for remediation of Cd-contaminated soil with biodegradable chelating agent and plant growth regulator combined with maize and investigated the mechanism of this technology. The results showed that the best remediation effect was achieved in the treatment with 10 mol l gibberellic acid (GA ) and 6 mmol kg aspartate diethoxysuccinic acid (AES) combined with maize. In this treatment, the total biomass and extraction efficiency of maize were 3.6 and 8.67 times higher than those of the control, respectively, and the antioxidant enzyme activities of maize were also increased. The soil was enriched with dominant bacterial genera that promote plant growth and metabolism and tolerance to heavy metal stress, which in turn promoted maize growth and Cd accumulation. Structural equation modelling results indicated a large effect of plant Cd concentration and plant antioxidant enzyme activity on plant Cd extraction. The enhanced phytoremediation technology showed good potential for safe use of Cd-contaminated soil.
ISSN:2054-5703
2054-5703
DOI:10.1098/rsos.240672