The contribution of atmospheric deposition of cadmium and lead to their accumulation in rice grains

Purpose Over-accumulation of cadmium and lead in rice grain is a global concern as it has adverse health impacts. Atmospheric deposition is an important source of heavy metal accumulation in soil, but contribution to crops has not been quantified and the mechanisms of foliar Cd and Pb uptake via the...

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Bibliographic Details
Published in:Plant and soil 2022-08, Vol.477 (1-2), p.373-387
Main Authors: Zhu, Zhen, Xu, Zhangqian, Peng, Jianwei, Fei, Jiangchi, Yu, Pengyue, Wang, Maodi, Tan, Yifan, Huang, Ying, Zhran, Mostafa, Fahmy, Ahmed
Format: Article
Language:English
Subjects:
Accumulation
Agriculture
Analysis
Atmospheric deposition
Biomedical and Life Sciences
Cadmium
Crop production
Crops
Deposition
Ecology
Experiments
Exposure
Fallout
Food safety
Geotechnical fabrics
Grain
Growth
Heavy metals
Isotope ratios
Lead
Lead isotopes
Life Sciences
Measurement
Membranes
Plant Physiology
Plant Sciences
Precipitation
Ratios
Research Article
Rice
Shoots
Soil pollution
Soil Science & Conservation
Soils
Stomata
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Summary:Purpose Over-accumulation of cadmium and lead in rice grain is a global concern as it has adverse health impacts. Atmospheric deposition is an important source of heavy metal accumulation in soil, but contribution to crops has not been quantified and the mechanisms of foliar Cd and Pb uptake via the stomata of rice leaves exposed to atmospheric fallout are unclear. Methods To quantify the contribution of atmospheric deposition on Cd and Pb accumulation in rice grains, a rice pot experiment with four exposure treatments (T1, all day exposure without geotextile membranes; T2, all day exposure with geotextile membranes; T3, daytime exposure with geotextile membranes; and T4, night exposure with geotextile membranes) using severely (ZZ) and moderately (XT) polluted soils was conducted. Results Cd content in shoots and roots was T1 > T2, T3 > T4 in XT soils, and T1 > T2, T4 > T3 in ZZ soils, while Pb content in both soils was T1 > T2, and T4 > T3. Cd and Pb contents in rice grains showed the same trend. Using the isotope ratios tracing method ( 114/111 Cd, 112/111 Cd, and 207/206 Pb, 208/206 Pb), it can be concluded that the contribution of atmospheric deposition to rice grains was quantified as 63.55% and 18.01% for Cd, and 27.69% and 41.13% for Pb in XT and ZZ soils, respectively. Conclusions Foliar uptake atmospheric deposition had substantial effect on Cd and Pb accumulation in rice grains and the control of heavy metal foliar uptake should be paid more attention to maintain rice safety production. Graphical abstract
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-022-05429-x