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| Effects of foliar application with malic acid on the accumulation of cadmium in rice |
| Received:July 18, 2020 |
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| KeyWord:rice;cadmium;malic acid;nutrient elements;amino acids;transport;foliar application |
| Author Name | Affiliation | E-mail | | WANG Hui-jun | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | XUE Wei-jie | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Xin | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Chang-bo | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUANG Yong-chun | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | REN Xing-hua | Xiangtan Agricultural Science Research Institute, Xiangtan 411134, China | | | LIU Zhong-qi | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | liuzhongqi508@163.com |
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| Abstract: |
| To explore the effect of spraying malic acid on the characteristics of Cd accumulation in rice during the grain filling period, the content of Cd, Ca, Fe, Mn, Zn, and amino acids in the organs of four early rice varieties was analyzed. Experimental results showed that the application of 5 mmol·L-1 malic acid significantly reduced the Cd content in grain, panicle neck, node, and flag leaf 2~3 times. The average Cd content in the four varieties of grains decreased from 0.26 mg·kg-1 to 0.14 mg·kg-1 and 0.09 mg·kg-1, and the corresponding percentages of Cd decrease were 46.15% and 65.38%, respectively. After three applications of malic acid, the glycine and valine content in the grains increased by 46.45% and 34.56%, respectively. The Cd content in the nodes was approximately 2~10 times higher than that in the panicle necks and flag leaves. The application of malic acid significantly inhibited the transfer of Cd from flag leaves to nodes 2~3 times, which reduced the Cd content in the nodes by 35.00%~56.88%. At the same time, the application of malic acid significantly increased the Ca content but reduced the content of Fe, Mn, and Zn in the rice organs. The Ca content in grains increased by 16.02%~26.60%, whereas those of Fe, Mn, and Zn decreased by 30.54%~43.14%, 23.07%~28.55%, and 11.31%~19.57%, respectively. These results indicate that the application of malic acid significantly decreases Cd content in grains, by inhibiting the transport of Cd from the vegetative organs to the grains and promoting the transport of Ca and the synthesis of amino acids in rice grains simultaneously. |
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