Effect and Mechanism of Foliar Application Nano-MnO 2 on Cadmium Enrichment of Rice

Cadmium (Cd) is easily enriched in rice, resulting in an excessive Cd content in the grain, which seriously threatens human health. Manganese (Mn) is an essential element of plants. In a field experiment on Cd-contaminated acid soils, we investigated the effectiveness and mechanism of Mn in minimizi...

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Published inHuanjing kexue Vol. 42; no. 2; p. 932
Main Authors Zhou, Yi-Min, Huang, Ya-Yuan, Liu, Xiao-Yue, Li, Bing-Yu, Liu, Yu-Yi, Li, Zhuo-Qing, Wang, Xin-Qi, Lei, Ming
Format Journal Article
LanguageChinese
Published China 08.02.2021
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Summary:Cadmium (Cd) is easily enriched in rice, resulting in an excessive Cd content in the grain, which seriously threatens human health. Manganese (Mn) is an essential element of plants. In a field experiment on Cd-contaminated acid soils, we investigated the effectiveness and mechanism of Mn in minimizing Cd accumulation in rice via foliar spraying using 0.1%, 0.3%, and 0.5% nano-MnO solutions at an early stage of heading. Compared with a control treatment, foliar spraying effectively reduced the Cd content of rice leaves, husks, and brown rice; increased the Mn content of all rice organs; but had no effect on rice yield. Foliar application of nano-MnO alleviated the plant stress induced by Cd by improving leaf photosynthesis, inhibiting lipid peroxidation, and increasing the content of the oxidative stress protein kinase. In addition, foliar application of nano-MnO limited the absorption of Cd by roots by increasing the content of iron-manganese plaque on the surfaces of rice roots and strengthening its adsorpti
ISSN:0250-3301