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The role of root apoplastic barriers in cadmium translocation and accumulation in cultivars of rice (Oryza sativa L.) with different Cd-accumulating characteristics.
Environ Pollut. 2020 Sep; 264:114736.EP

Abstract

The radial translocation of cadmium (Cd) from the root to the shoot is one of the major processes affecting Cd accumulation in rice (Oryza sativa L.) grains, but few studies have focused on Cd apoplastic transport in rice. The aim of this study was to determine how apoplastic barriers affect Cd translocation via the apoplastic pathway, Cd accumulation levels in upper parts (shoot and grains) of rice cultivars, and the possible mechanism involved. Hydroponic and soil pot trials were conducted to study the development and chemical constituents of apoplastic barriers and their permeability to bypass flow, and to determine Cd localization in the roots of rice cultivars with different Cd-accumulating characteristics. The Cd accumulation in upper parts was positively correlated with bypass flow in the root and the apparent Cd concentration in the xylem, indicating that the apoplastic pathway may play an important role in Cd root-shoot translocation in rice. Apoplastic barriers were deposited closer to the root tip and were thicker in low Cd-accumulating cultivars than in high Cd-accumulating cultivars. The amounts and rates of increase in lignin and suberin were significantly higher in ZD14 (a low Cd-accumulating cultivar) than in FYXZ (a high Cd-accumulating cultivar) under Cd stress, indicating that stronger barriers were induced by Cd in ZD14. The stronger and earlier formation of barriers in the low Cd-accumulating cultivar decreased bypass flow more efficiently, so that more Cd was retained in the root during apoplastic translocation. This was confirmed by localization analyses of Cd in root transverse sections. These results suggest that apoplastic barriers reduce Cd root-to-shoot translocation via the apoplastic pathway, leading to lower Cd accumulation in the upper parts of rice plants. Bypass flow may have the potential to be used as a rapid screening indicator for low Cd-accumulating rice cultivars.

Authors+Show Affiliations

School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, China.Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China.Department of Science and Environmental Studies, The Education University of Hong Kong, Hong Kong, China.School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, China. Electronic address: lssyzhh@mail.sysu.edu.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32417578

Citation

Qi, Xiaoli, et al. "The Role of Root Apoplastic Barriers in Cadmium Translocation and Accumulation in Cultivars of Rice (Oryza Sativa L.) With Different Cd-accumulating Characteristics." Environmental Pollution (Barking, Essex : 1987), vol. 264, 2020, p. 114736.
Qi X, Tam NF, Li WC, et al. The role of root apoplastic barriers in cadmium translocation and accumulation in cultivars of rice (Oryza sativa L.) with different Cd-accumulating characteristics. Environ Pollut. 2020;264:114736.
Qi, X., Tam, N. F., Li, W. C., & Ye, Z. (2020). The role of root apoplastic barriers in cadmium translocation and accumulation in cultivars of rice (Oryza sativa L.) with different Cd-accumulating characteristics. Environmental Pollution (Barking, Essex : 1987), 264, 114736. https://doi.org/10.1016/j.envpol.2020.114736
Qi X, et al. The Role of Root Apoplastic Barriers in Cadmium Translocation and Accumulation in Cultivars of Rice (Oryza Sativa L.) With Different Cd-accumulating Characteristics. Environ Pollut. 2020;264:114736. PubMed PMID: 32417578.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The role of root apoplastic barriers in cadmium translocation and accumulation in cultivars of rice (Oryza sativa L.) with different Cd-accumulating characteristics. AU - Qi,Xiaoli, AU - Tam,Nora Fung-Yee, AU - Li,Wai Chin, AU - Ye,Zhihong, Y1 - 2020/05/04/ PY - 2019/11/12/received PY - 2020/04/20/revised PY - 2020/05/03/accepted PY - 2020/5/18/pubmed PY - 2020/7/11/medline PY - 2020/5/18/entrez KW - Apoplastic barriers KW - Bypass flow KW - Cadmium accumulation KW - Rice SP - 114736 EP - 114736 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ Pollut VL - 264 N2 - The radial translocation of cadmium (Cd) from the root to the shoot is one of the major processes affecting Cd accumulation in rice (Oryza sativa L.) grains, but few studies have focused on Cd apoplastic transport in rice. The aim of this study was to determine how apoplastic barriers affect Cd translocation via the apoplastic pathway, Cd accumulation levels in upper parts (shoot and grains) of rice cultivars, and the possible mechanism involved. Hydroponic and soil pot trials were conducted to study the development and chemical constituents of apoplastic barriers and their permeability to bypass flow, and to determine Cd localization in the roots of rice cultivars with different Cd-accumulating characteristics. The Cd accumulation in upper parts was positively correlated with bypass flow in the root and the apparent Cd concentration in the xylem, indicating that the apoplastic pathway may play an important role in Cd root-shoot translocation in rice. Apoplastic barriers were deposited closer to the root tip and were thicker in low Cd-accumulating cultivars than in high Cd-accumulating cultivars. The amounts and rates of increase in lignin and suberin were significantly higher in ZD14 (a low Cd-accumulating cultivar) than in FYXZ (a high Cd-accumulating cultivar) under Cd stress, indicating that stronger barriers were induced by Cd in ZD14. The stronger and earlier formation of barriers in the low Cd-accumulating cultivar decreased bypass flow more efficiently, so that more Cd was retained in the root during apoplastic translocation. This was confirmed by localization analyses of Cd in root transverse sections. These results suggest that apoplastic barriers reduce Cd root-to-shoot translocation via the apoplastic pathway, leading to lower Cd accumulation in the upper parts of rice plants. Bypass flow may have the potential to be used as a rapid screening indicator for low Cd-accumulating rice cultivars. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/32417578/The_role_of_root_apoplastic_barriers_in_cadmium_translocation_and_accumulation_in_cultivars_of_rice__Oryza_sativa_L___with_different_Cd_accumulating_characteristics_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0269-7491(19)36724-7 DB - PRIME DP - Unbound Medicine ER -
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