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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