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Cadmium adsorption, chelation and compartmentalization limit root-to-shoot translocation of cadmium in rice (Oryza sativa L.).
Environ Sci Pollut Res Int. 2017 Apr; 24(12):11319-11330.ES

Abstract

Strategies to reduce cadmium (Cd) in rice grain, below concentrations that represent serious human health concerns, require that the mechanisms of Cd distribution and accumulation within rice plants be established. Here, a comprehensive hydroponic experiment was performed to investigate the differences in the Cd uptake, chelation and compartmentalization between high (D83B) and low (D62B) Cd-accumulation cultivars contrasting in Cd accumulation in order to establish the roles of these processes in limiting Cd translocation from root to shoot. D83B showed 3-fold higher Cd accumulation in the shoots than the cultivar D62B. However, a short-term Cd uptake experiment showed more Cd uptake by D62B than by D83B. The distribution of Cd in roots and shoots differed significantly. D83B translocated 38% of total Cd taken up to the shoots, whereas D62B retained most of the Cd in the roots. D62B had higher amounts of non-protein thiols (NPTs) and glutathione (GSH) than D83B. The NPT and Cd distribution ratio (CDR) in the anionic form in the roots of D62B increased gradually as Cd concentration increased. In D83B, in contrast, levels of CDR in the cationic form increased significantly from 22.10 to 43.37%, while NPT only increased slightly. Furthermore, the percentage of Cd ions retained in thiol-rich peptides, especially in the HMW complexes, was significantly higher in D62B compared with D83B. However, D83B possessed a greater proportion of potentially mobile (cationic) Cd in the roots and showed superior Cd translocation from root to shoot. Taken as a whole, the results presented in this study revealed that Cd chelation, compartmentalization and adsorption contribute to the Cd retention in roots.

Authors+Show Affiliations

College of Resources, Sichuan Agricultural University, Huimin Road 211, Chengdu, Sichuan, 611130, China.College of Resources, Sichuan Agricultural University, Huimin Road 211, Chengdu, Sichuan, 611130, China. w.changquan@163.com.Rice Research Institute, Sichuan Agricultural University, Huimin Road 211, Chengdu, Sichuan, 611130, China.College of Resources, Sichuan Agricultural University, Huimin Road 211, Chengdu, Sichuan, 611130, China.College of Resources, Sichuan Agricultural University, Huimin Road 211, Chengdu, Sichuan, 611130, China.College of Resources, Sichuan Agricultural University, Huimin Road 211, Chengdu, Sichuan, 611130, China.Rice Research Institute, Sichuan Agricultural University, Huimin Road 211, Chengdu, Sichuan, 611130, China.Department of Agriculture Science, Helsinki University, P.O. Box 27, Latokartanonkaari 5, FI-00014, Helsinki, Finland.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28303536

Citation

Xu, Qiang, et al. "Cadmium Adsorption, Chelation and Compartmentalization Limit Root-to-shoot Translocation of Cadmium in Rice (Oryza Sativa L.)." Environmental Science and Pollution Research International, vol. 24, no. 12, 2017, pp. 11319-11330.
Xu Q, Wang C, Li S, et al. Cadmium adsorption, chelation and compartmentalization limit root-to-shoot translocation of cadmium in rice (Oryza sativa L.). Environ Sci Pollut Res Int. 2017;24(12):11319-11330.
Xu, Q., Wang, C., Li, S., Li, B., Li, Q., Chen, G., Chen, W., & Wang, F. (2017). Cadmium adsorption, chelation and compartmentalization limit root-to-shoot translocation of cadmium in rice (Oryza sativa L.). Environmental Science and Pollution Research International, 24(12), 11319-11330. https://doi.org/10.1007/s11356-017-8775-1
Xu Q, et al. Cadmium Adsorption, Chelation and Compartmentalization Limit Root-to-shoot Translocation of Cadmium in Rice (Oryza Sativa L.). Environ Sci Pollut Res Int. 2017;24(12):11319-11330. PubMed PMID: 28303536.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cadmium adsorption, chelation and compartmentalization limit root-to-shoot translocation of cadmium in rice (Oryza sativa L.). AU - Xu,Qiang, AU - Wang,Changquan, AU - Li,Shigui, AU - Li,Bing, AU - Li,Qiquan, AU - Chen,Guangdeng, AU - Chen,Weilan, AU - Wang,Feng, Y1 - 2017/03/16/ PY - 2016/10/12/received PY - 2017/03/08/accepted PY - 2017/3/18/pubmed PY - 2017/6/20/medline PY - 2017/3/18/entrez KW - Cadmium KW - Cadmium-binding complexes KW - Genotypic variation KW - Oryza sativa KW - Xylem loading SP - 11319 EP - 11330 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 24 IS - 12 N2 - Strategies to reduce cadmium (Cd) in rice grain, below concentrations that represent serious human health concerns, require that the mechanisms of Cd distribution and accumulation within rice plants be established. Here, a comprehensive hydroponic experiment was performed to investigate the differences in the Cd uptake, chelation and compartmentalization between high (D83B) and low (D62B) Cd-accumulation cultivars contrasting in Cd accumulation in order to establish the roles of these processes in limiting Cd translocation from root to shoot. D83B showed 3-fold higher Cd accumulation in the shoots than the cultivar D62B. However, a short-term Cd uptake experiment showed more Cd uptake by D62B than by D83B. The distribution of Cd in roots and shoots differed significantly. D83B translocated 38% of total Cd taken up to the shoots, whereas D62B retained most of the Cd in the roots. D62B had higher amounts of non-protein thiols (NPTs) and glutathione (GSH) than D83B. The NPT and Cd distribution ratio (CDR) in the anionic form in the roots of D62B increased gradually as Cd concentration increased. In D83B, in contrast, levels of CDR in the cationic form increased significantly from 22.10 to 43.37%, while NPT only increased slightly. Furthermore, the percentage of Cd ions retained in thiol-rich peptides, especially in the HMW complexes, was significantly higher in D62B compared with D83B. However, D83B possessed a greater proportion of potentially mobile (cationic) Cd in the roots and showed superior Cd translocation from root to shoot. Taken as a whole, the results presented in this study revealed that Cd chelation, compartmentalization and adsorption contribute to the Cd retention in roots. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/28303536/Cadmium_adsorption_chelation_and_compartmentalization_limit_root_to_shoot_translocation_of_cadmium_in_rice__Oryza_sativa_L___ L2 - https://dx.doi.org/10.1007/s11356-017-8775-1 DB - PRIME DP - Unbound Medicine ER -