Research Article | OPEN ACCESS
Uptake and Bioaccumulation of Heavy Metals in Rice Plants as Affect by Water Saving Irrigation
1, 2Linxian Liao, 1, 2Junzeng Xu, 1, 2Shizhang Peng, 2Zhenfang Qiao and 2Xiaoli Gao
1State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering
2College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China
Advance Journal of Food Science and Technology 2013 9:1244-1248
Received: June 17, 2013 | Accepted: June 25, 2013 | Published: September 05, 2013
Abstract
To reveal the impact of Non-Flooding controlled Irrigation (NFI) on the bioavailability and bioaccumulation of metals (Cu, Pb, Cd and Cr) in rice fields, metals concentration in different organs of rice plant growing under both Flooding Irrigation (FI) and NFI were measured. It indicated that metals concentrations in root are always the highest one among all the plant organs and in the spike is the lowest. Compared with FI rice, NFI resulted in higher metal concentrations, bioaccumulation factors and metals uptakes of Cd, Cu and Pb. That might ascribed to the higher solubility and bioavailability of metals and the higher rice root absorbent ability under drying-wetting condition. But for Cr, NFI resulted in lower Cr concentration and uptakes in rice root than FI. It indicated that the Cr bound to the Fe and Mn oxides which were more stable under NFI condition may play a more important role in determining the bioavailability of Cr in paddy soil, but metals bound to organic matter which were more likely released may play a more important role for metals of Cu, Cd and Pb. When the soil is free from metals polluted, NFI can help to improve the availability of Cu as a micronutrient and reduce soil metals accumulation by drawing more metals out of the soil by plant uptakes. If the soil is metal polluted, NFI might result in the higher risk of food metals pollution in short-term. But long-term use of NFI will result in less metals accumulation in soil and finally resulted in reduced crop metals uptakes.
Keywords:
Bioaccumulation, heavy metal, rice, uptake, water saving irrigation,
Competing interests
The authors have no competing interests.
Open Access Policy
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Copyright
The authors have no competing interests.
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ISSN (Online): 2042-4876
ISSN (Print): 2042-4868 |
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