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| Effect of combined application of EGTA and organic acid on remediation of Cd-contaminated soil by Corchorus capsularis L. |
| Received:May 24, 2018 Revised:August 01, 2018 |
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| KeyWord:organic acid;EGTA;Corchorus capsularis L.;Cd stress |
| Author Name | Affiliation | E-mail | | XIA Juan-wen | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | XU Xiao-xun | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
Key Laboratory of Soil Environment Protection of Sichuan Province, Chengdu 611130, China | xuxiaoxun2013@163.com | | LU Xin | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | CHEN Zhi-yin | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | TANG Yan | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Shi-rong | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
Key Laboratory of Soil Environment Protection of Sichuan Province, Chengdu 611130, China | |
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| Abstract: |
| In this study, we focused on the effects of combined application of chelating agents and organic acid on Cd absorption and accumulation by Corchorus capsularis L. Pot experiments were conducted to investigate the effects of citric acid (CA)and tartaric acid (TA) combined with EGTA on physiological characteristics and Cd accumulation in C. capsularis. The results showed that the application of EGTA and organic acids promoted the synthesis of photosynthetic pigments and increased the activity of antioxidant enzymes in C. capsularis. All treatments increased plant height, root length and biomass of C. capsularis, and the maximum biomass of plant when the EGTA and TA were both at 2 mol·L-1 T2E2 treatment (EGTA and TA were both at 2 mol·L-1)was 2.69 higher than that of the control. The combination of EGTA with CA and TA increased the concentration and accumulation of Cd in different organs of C. capsularis, and the highest shoot Cd accumulation reached 643.02 μg·plant-1 with the C1E1 treatment (EGTA and CA were both at 1 mol·L-1). The bioconcentration factor of the root and shoot improved after the treatments, with an increase of 1.30~2.14 times and 0.11~0.80 times, respectively. With the application of EGTA and organic acid, the transportation factor increased by 0.64~1.66 times, and reached a maximum of 3.15. The Cd purification rate was significantly increased, reaching a maximum of 0.346% in the T2E2 and C1E1 treatments, which 7.69 times higher than that of the control. The overall results demonstrate that the application of EGTA and organic acids together improve the phytoextraction in C. capsularis. |
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