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

文献类型： 外文期刊

第一作者： Zhang, Shuo

作者： Zhang, Shuo;Zeng, Fanrong;Zhang, Shuo;Li, Qi;Nazir, Muhammad Mudassir;Zeng, Fanrong;Ali, Shafaqat;Ali, Shafaqat;Ouyang, Younan;Ye, Shuzhen

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关键词： cadmium; calcium; crop safety; membrane transport; net Cd2+ influx; root-to-shoot translocation

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）

ISSN：

年卷期： 2020 年 21 卷 21 期

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收录情况： SCI

摘要： 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.

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