Pedosphere 29(2): 161--169, 2019
ISSN 1002-0160/CN 32-1315/P
©2019 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effects of a New-Type Cleaning Agent and a Plant Growth Regulator on Phytoextraction of Cadmium from a Contaminated Soil |
HE Shanying1, GUO Haihui1, Zhenli HE2, WANG Lei1 |
1College of Environmental Science and Engineering, Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Gongshang University, Hangzhou 310012 (China); 2Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce FL 34945 (USA) |
Corresponding Author:HE Shanying |
ABSTRACT |
In China, great efforts are being made to remediate farmlands polluted by heavy metals. In this study, a soil pot experiment was conducted to examine the effects of a new-type cleaning agent, methylglycinediacetic acid (MGDA), and a plant growth regulator (PGR), diethl aminoethyl hexanoate (DA-6), on plant growth and extraction and detoxification of cadmium (Cd) by ryegrass. The results showed that foliar spray of DA-6 alone improved plant growth, with root length and shoot dry biomass increased by 38.5%- 58.6% and 71.1%-89.3%, respectively, whereas addition of MGDA alone decreased root length and shoot dry biomass by 10.3%-18.6% and 9.1%-21.8%, respectively. Diethl aminoethyl hexanoate promoted the binding of Cd to cell walls and thus alleviated the toxicity of Cd and/or MGDA to plants. Applications of DA-6 and/or MGDA resulted in a significant increase in Cd extraction efficiency (P < 0.05), and the efficiency decreased in the order of MGDA + DA-6 > DA-6 > MGDA. The treatment of MGDA + DA-6 achieved 2.2%, 1.7%, and 0.8% Cd extraction efficiency by ryegrass in soils spiked with 25, 50, 100 mg Cd kg-1, respectively. Therefore, treatment of MGDA + DA-6 could be an efficient method for enhancing phytoremediation of Cd-contaminated soil by ryegrass. |
Key Words: diethl aminoethyl hexanoate,extraction efficiency,heavy metal,methylglycinediacetic acid,phytoremediation,ryegrass,subcellular distribution,toxicity |
Citation: He S Y, Guo H H, He Z, Wang L. 2019. Effects of a new-type cleaning agent and a plant growth regulator on phytoextraction of cadmium from a contaminated soil. Pedosphere. 29(2):161-169. |
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