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| Effects of exogenous zinc on cadmium uptake and transport in rice |
| Received:February 20, 2019 |
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| KeyWord:rice;zinc;cadmium;apoplast pathway |
| Author Name | Affiliation | E-mail | | CHEN Shi-miao | Guangxi University, Guangxi Key Laboratory of Agri-environment and Agri-Products Safety, Nanning 530005, China | | | XIN Zi-bing | Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guangxi Institute of Botany, Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guilin 541006, China | | | LU Qin-yu | Guangxi University, Guangxi Key Laboratory of Agri-environment and Agri-Products Safety, Nanning 530005, China | | | ZHENG Fu-hai | Guangzhou Institute of Forestry and Landscape Architecture, Guangzhou 510405, China | | | HE Bing | Guangxi University, Guangxi Key Laboratory of Agri-environment and Agri-Products Safety, Nanning 530005, China | hebing@gxu.edu.cn |
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| Abstract: |
| To investigate the effects of exogenous Zn on Cd uptake and accumulation in rice plants, we analyzed plant biomass, cell wall components, and concentrations of Cd in root iron plaque, roots, and shoots of rice plants under Cd stress with or without addition of Zn by using a high Cd-accumulating rice variety, Yanliangyou 888. The results showed that shoot biomass of rice plants was significantly decreased under exposure to both Zn and Cd, compared with exposure to Cd only. Applied Zn significantly increased Cd accumulation in both roots and shoots of rice under Cd stress. The concentrations of Fe and Cd were also 18.70% and 29.99% higher, respectively, in root iron plaque collected from rice plants exposed to Zn relative to control plants. Meanwhile, exogenous Zn significantly reduced the contents of pectin and hemicellulose in roots, decreasing the capacity of cell walls to absorb Cd. These results suggest that Zn may increase root uptake of Cd in rice by improving Cd absorption by the iron plaque, promoting the translocation of Cd to shoots by reducing metal absorption by cell walls in roots. |
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