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Iron fractions responsible for the variation of Cd bioavailability in paddy soil under variable pe+pH conditions.
Chemosphere. 2020 Jul; 251:126355.C

Abstract

Iron (Fe) in soil is closely related to cadmium (Cd) uptake by rice plants, and soil pe + pH significantly influences Fe redox behavior. This study aimed to explore the influential mechanisms of varying pe + pH conditions on the transformation of iron oxides in the rhizosphere and the subsequent effect on Cd accumulation in rice plants. A two-month pot experiment was conducted to investigate the effect of soil pe + pH on the fractions of iron oxides and formation of iron plaque (IP), as well as the effect of these changes on Cd uptake by rice plants (Oryza sativa L.). Different irrigation strategies, 70% water holding capacity (DY), continuous flooding (FL), and alternate flooding/drying weekly (AWD), were used to achieve various soil pe + pH levels. The results showed that low pe + pH conditions (under the FL and AWD treatments) were more beneficial to the transformation of crystalline iron oxides into amorphous forms in rhizosphere soil and the precipitation of IP on rice roots. The increase of amorphous iron oxides resulted in the reduction of Cd availability in rhizosphere soil by immobilizing more Cd on Fe oxides. Moreover, Cd adsorbed on rice root surfaces reacted with IP, inhibiting Cd soil-to-root transport. The two mechanisms combinatively functioned at decreasing Cd concentration in rice shoots by 14.1-33.1% at low pe + pH conditions compared to that of the high pe + pH (DY treatment). These results indicate that lowering soil pe + pH effectively reduced Cd accumulation in rice plants, probably through the immobilization of amorphous Fe oxides on Cd and sequestration of iron-plaque on Cd.

Authors+Show Affiliations

Key Laboratory of Plant Nutrition and Fertilizer, Agriculture and Rural Affairs / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.Key Laboratory of Plant Nutrition and Fertilizer, Agriculture and Rural Affairs / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China. Electronic address: chenshibao@caas.cn.Key Laboratory of Plant Nutrition and Fertilizer, Agriculture and Rural Affairs / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China. Electronic address: wangmeng@caas.cn.Key Laboratory of Plant Nutrition and Fertilizer, Agriculture and Rural Affairs / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.Key Laboratory of Plant Nutrition and Fertilizer, Agriculture and Rural Affairs / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.Key Laboratory of Plant Nutrition and Fertilizer, Agriculture and Rural Affairs / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.Key Laboratory of Plant Nutrition and Fertilizer, Agriculture and Rural Affairs / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.Key Laboratory of Plant Nutrition and Fertilizer, Agriculture and Rural Affairs / Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32169702

Citation

Li, Shanshan, et al. "Iron Fractions Responsible for the Variation of Cd Bioavailability in Paddy Soil Under Variable pe+pH Conditions." Chemosphere, vol. 251, 2020, p. 126355.
Li S, Chen S, Wang M, et al. Iron fractions responsible for the variation of Cd bioavailability in paddy soil under variable pe+pH conditions. Chemosphere. 2020;251:126355.
Li, S., Chen, S., Wang, M., Lei, X., Zheng, H., Sun, X., Wang, L., & Han, Y. (2020). Iron fractions responsible for the variation of Cd bioavailability in paddy soil under variable pe+pH conditions. Chemosphere, 251, 126355. https://doi.org/10.1016/j.chemosphere.2020.126355
Li S, et al. Iron Fractions Responsible for the Variation of Cd Bioavailability in Paddy Soil Under Variable pe+pH Conditions. Chemosphere. 2020;251:126355. PubMed PMID: 32169702.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Iron fractions responsible for the variation of Cd bioavailability in paddy soil under variable pe+pH conditions. AU - Li,Shanshan, AU - Chen,Shibao, AU - Wang,Meng, AU - Lei,Xiaoqin, AU - Zheng,Han, AU - Sun,Xiaoyi, AU - Wang,Lifu, AU - Han,Yun, Y1 - 2020/02/26/ PY - 2019/12/02/received PY - 2020/02/13/revised PY - 2020/02/25/accepted PY - 2020/3/15/pubmed PY - 2020/6/4/medline PY - 2020/3/15/entrez KW - Amorphous iron oxides KW - Cd availability KW - Iron plaque KW - Rice KW - pe+pH SP - 126355 EP - 126355 JF - Chemosphere JO - Chemosphere VL - 251 N2 - Iron (Fe) in soil is closely related to cadmium (Cd) uptake by rice plants, and soil pe + pH significantly influences Fe redox behavior. This study aimed to explore the influential mechanisms of varying pe + pH conditions on the transformation of iron oxides in the rhizosphere and the subsequent effect on Cd accumulation in rice plants. A two-month pot experiment was conducted to investigate the effect of soil pe + pH on the fractions of iron oxides and formation of iron plaque (IP), as well as the effect of these changes on Cd uptake by rice plants (Oryza sativa L.). Different irrigation strategies, 70% water holding capacity (DY), continuous flooding (FL), and alternate flooding/drying weekly (AWD), were used to achieve various soil pe + pH levels. The results showed that low pe + pH conditions (under the FL and AWD treatments) were more beneficial to the transformation of crystalline iron oxides into amorphous forms in rhizosphere soil and the precipitation of IP on rice roots. The increase of amorphous iron oxides resulted in the reduction of Cd availability in rhizosphere soil by immobilizing more Cd on Fe oxides. Moreover, Cd adsorbed on rice root surfaces reacted with IP, inhibiting Cd soil-to-root transport. The two mechanisms combinatively functioned at decreasing Cd concentration in rice shoots by 14.1-33.1% at low pe + pH conditions compared to that of the high pe + pH (DY treatment). These results indicate that lowering soil pe + pH effectively reduced Cd accumulation in rice plants, probably through the immobilization of amorphous Fe oxides on Cd and sequestration of iron-plaque on Cd. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/32169702/Iron_fractions_responsible_for_the_variation_of_Cd_bioavailability_in_paddy_soil_under_variable_pe+pH_conditions_ DB - PRIME DP - Unbound Medicine ER -