Using rice as a remediating plant to deplete bioavailable arsenic from paddy soils
Rice plant is efficient in arsenic (As) accumulation due to enhanced soil As release under flooded condition and its effective As uptake. Therefore, rice plant can be used to remove bioavailable As from paddy soil. In this study, the depleting dynamics of soil As with rice growth was mapped two-dime...
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doaj-0c63d37719dc44ec95c111cba16a7a9e2020-11-25T02:40:07ZengElsevierEnvironment International0160-41202020-08-01141105799Using rice as a remediating plant to deplete bioavailable arsenic from paddy soilsSixue He0Xin Wang1Xin Wu2Yulong Yin3Lena Q. Ma4Key Laboratory of Environmental Heavy-Metal Contamination and Ecological Remediation, College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, ChinaKey Laboratory of Environmental Heavy-Metal Contamination and Ecological Remediation, College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China; Corresponding author at: Lushan Road, YueLu District, Changsha, China.Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production, Changsha, Hunan 410125, ChinaKey Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China; National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production, Changsha, Hunan 410125, ChinaInstitute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, ChinaRice plant is efficient in arsenic (As) accumulation due to enhanced soil As release under flooded condition and its effective As uptake. Therefore, rice plant can be used to remove bioavailable As from paddy soil. In this study, the depleting dynamics of soil As with rice growth was mapped two-dimensionally with the zirconium-oxide diffusive gradients in thin films (DGT) technique. Further, the key biochemistry promoting soil As bioavailability was studied to better understand the underlying processes. Results revealed that the average DGT-As encompassing the root zone decreased steeply from 331 in the seedling stage to 136 in the heading & flowering stage and further to 118 μg l−1 at harvest, which was 26% lower than that of the control at 160 μg l−1. During this process, rhizosphere porewater As developed a dynamic profile similar to Fe and dissolved organic carbon, with the diversity of arrA gene peaking at heading & flowering stage. The data support soil As release from microbial reduction of Fe hydroxides fueled by root exudation as carbon source. Arsenic was mainly accumulated in the roots, accounting for up to 95% of total As in rice plants. Removal of rice roots resulted in ~19% lower DGT-As in post-harvest soil compared to without removing the roots. As a result, a sharp decline in As accumulation in rice plants was obtained in the second planting after removing one crop of rice roots. The results highlight that rice, as a paddy-adapted plant, is effective in As uptake in the roots, and thereby removing rice roots efficiently depletes bioavailable As from paddy soils.http://www.sciencedirect.com/science/article/pii/S0160412020306152Plant uptakePhytoremediationDGTBioavailableRoot |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sixue He Xin Wang Xin Wu Yulong Yin Lena Q. Ma |
spellingShingle |
Sixue He Xin Wang Xin Wu Yulong Yin Lena Q. Ma Using rice as a remediating plant to deplete bioavailable arsenic from paddy soils Environment International Plant uptake Phytoremediation DGT Bioavailable Root |
author_facet |
Sixue He Xin Wang Xin Wu Yulong Yin Lena Q. Ma |
author_sort |
Sixue He |
title |
Using rice as a remediating plant to deplete bioavailable arsenic from paddy soils |
title_short |
Using rice as a remediating plant to deplete bioavailable arsenic from paddy soils |
title_full |
Using rice as a remediating plant to deplete bioavailable arsenic from paddy soils |
title_fullStr |
Using rice as a remediating plant to deplete bioavailable arsenic from paddy soils |
title_full_unstemmed |
Using rice as a remediating plant to deplete bioavailable arsenic from paddy soils |
title_sort |
using rice as a remediating plant to deplete bioavailable arsenic from paddy soils |
publisher |
Elsevier |
series |
Environment International |
issn |
0160-4120 |
publishDate |
2020-08-01 |
description |
Rice plant is efficient in arsenic (As) accumulation due to enhanced soil As release under flooded condition and its effective As uptake. Therefore, rice plant can be used to remove bioavailable As from paddy soil. In this study, the depleting dynamics of soil As with rice growth was mapped two-dimensionally with the zirconium-oxide diffusive gradients in thin films (DGT) technique. Further, the key biochemistry promoting soil As bioavailability was studied to better understand the underlying processes. Results revealed that the average DGT-As encompassing the root zone decreased steeply from 331 in the seedling stage to 136 in the heading & flowering stage and further to 118 μg l−1 at harvest, which was 26% lower than that of the control at 160 μg l−1. During this process, rhizosphere porewater As developed a dynamic profile similar to Fe and dissolved organic carbon, with the diversity of arrA gene peaking at heading & flowering stage. The data support soil As release from microbial reduction of Fe hydroxides fueled by root exudation as carbon source. Arsenic was mainly accumulated in the roots, accounting for up to 95% of total As in rice plants. Removal of rice roots resulted in ~19% lower DGT-As in post-harvest soil compared to without removing the roots. As a result, a sharp decline in As accumulation in rice plants was obtained in the second planting after removing one crop of rice roots. The results highlight that rice, as a paddy-adapted plant, is effective in As uptake in the roots, and thereby removing rice roots efficiently depletes bioavailable As from paddy soils. |
topic |
Plant uptake Phytoremediation DGT Bioavailable Root |
url |
http://www.sciencedirect.com/science/article/pii/S0160412020306152 |
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