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Open AccessArticle

Calcium Plays a Double-Edged Role in Modulating Cadmium Uptake and Translocation in Rice

1
Collaborative Innovation Centre for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 434025, China
2
Institute of Crop Science, Zhejiang University, Hangzhou 310058, China
3
Department of Environmental Sciences and Engineering, GC University Faisalabad, Faisalabad 38000, Pakistan
4
Department of Biological Sciences and Technology, China Medical University, Taichung 40402, Taiwan
5
China National Rice Research Institute, Hangzhou 310006, China
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(21), 8058; https://doi.org/10.3390/ijms21218058
Received: 27 September 2020 / Revised: 21 October 2020 / Accepted: 27 October 2020 / Published: 29 October 2020
(This article belongs to the Special Issue Ion Transport and Homeostasis in Plants)
Cadmium (Cd) contamination in soils poses great risks to both agricultural production and human health. Calcium (Ca) is an essential element playing a significant role in protecting plants against Cd toxicity. However, how Ca affects Cd uptake and translocation in rice is still not fully elucidated. In this study, the regulatory role of Ca in Cd uptake and upward translocation was investigated in rice at different growth stages. Our results showed that the supplement of 5 mM Ca significantly reduced Cd uptake by rice roots, because of their competition for Ca-permeable channels as an absorption site and Ca-induced downregulation of OsNRAMP1 and OsNRAMP5. However, Ca application facilitated the upward translocation of Cd by both upregulating OsHMA2 to induce xylem loading of Cd and downregulating OsHMA3 to reduce vacuolar sequestration of Cd. Such contrary results suggested a double-edged role of Ca in regulating root Cd uptake and root-to-shoot Cd translocation in rice. Although it increased Cd content in the aboveground vegetative tissues during the whole growth period, the addition of 5 mM Ca eventually decreased Cd content in rice grains at the ripening stage. All these results suggest that Ca-based amendments possess great potential for the production of low-Cd rice grains. View Full-Text
Keywords: cadmium; calcium; crop safety; membrane transport; net Cd2+ influx; root-to-shoot translocation cadmium; calcium; crop safety; membrane transport; net Cd2+ influx; root-to-shoot translocation
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MDPI and ACS Style

Zhang, S.; Li, Q.; Nazir, M.M.; Ali, S.; Ouyang, Y.; Ye, S.; Zeng, F. Calcium Plays a Double-Edged Role in Modulating Cadmium Uptake and Translocation in Rice. Int. J. Mol. Sci. 2020, 21, 8058. https://doi.org/10.3390/ijms21218058

AMA Style

Zhang S, Li Q, Nazir MM, Ali S, Ouyang Y, Ye S, Zeng F. Calcium Plays a Double-Edged Role in Modulating Cadmium Uptake and Translocation in Rice. International Journal of Molecular Sciences. 2020; 21(21):8058. https://doi.org/10.3390/ijms21218058

Chicago/Turabian Style

Zhang, Shuo; Li, Qi; Nazir, Muhammad M.; Ali, Shafaqat; Ouyang, Younan; Ye, Shuzhen; Zeng, Fanrong. 2020. "Calcium Plays a Double-Edged Role in Modulating Cadmium Uptake and Translocation in Rice" Int. J. Mol. Sci. 21, no. 21: 8058. https://doi.org/10.3390/ijms21218058

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