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| Effects of foliar application with zinc on the characteristics of cadmium accumulation in organs of rice plants |
| Received:December 06, 2018 |
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| KeyWord:rice;cadmium;zinc;nutrient elements;foliar application |
| Author Name | Affiliation | E-mail | | HAN Xiao-xiao | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | REN Xing-hua | Xiangtan City Agricultural Science Research Institute, Xiangtan 411134, China | | | WANG Pei-pei | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUANG Yong-chun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Chang-bo | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LIU Zhong-qi | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | liuzhongqi508@163.com |
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| Abstract: |
| In order to explore the effects of ZnSO4 on the accumulation of cadmium in different organs of rice plants, different concentrations of zinc were sprayed during the anthesis period and quantities of cadmium as well as other essential elements in the organs were analyzed. Experimental results showed that when plants were grown in the same Cd-contaminated farmland, the cadmium content in different organs of late rice in different treatments was significantly higher than that in early rice. Compared with the control, foliar application with 5 mmol·L-1 and 10 mmol·L-1 ZnSO4 was found to significantly reduce cadmium in grains and rachises and in the uppermost nodes of late rice and early rice. Grain Cd was significantly and positively correlated with Cd content in the uppermost nodes and in the second nodes. Furthermore, irrespective of the control plot or the treatment plot and regardless of late rice or early rice, the concentration of Cd in uppermost nodes was approximately 10 times higher than that in rachises and flag leaves, and the concentration of Cd in the second nodes was approximately three times higher than that in the second internodes. The results showed that Zn concentrations in grains of late rice increased by 13.81% and 44.60%, and in grains of early rice increased by 39.02% and 47.88% respectively, after spraying with 5 mmol·L-1 and 10 mmol·L-1 of zinc. The concentration of K in grains and rachises decreased in late rice and early rice and foliar application with ZnSO4 did not have a significant effect on the concentration of Mg in grains. Spraying with 10 mmol·L-1 of zinc significantly reduced levels of K, Ca and Mn in grains of late rice and early rice. These results indicate that foliar application with different concentrations of zinc is able to efficiently increase Zn level and decrease Cd quantity in grains by promoting Zn allocation and inhibiting Cd transport from vegetative organs to grains. |
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