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| Effects of foliar application of chlorinated amino acetic acid on cadmium transport and accumulation characteristics in rice |
| Received:November 30, 2022 |
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| KeyWord:rice|cadmium|foliar conditioner|amino acid|chlorinated amino acetic acid|oxidative damage |
| Author Name | Affiliation | E-mail | | LIU Shuangyue | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | FU Lin | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Changbo | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | zhangchangbo@caas.cn | | DENG Jiawei | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | XUE Weijie | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LIU Zhongqi | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Changrong | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | DENG Yun | School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China | |
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| Abstract: |
| To explore the effects of foliar application of chlorinated amino acetic acid on the transport characteristics of Cd in rice during the flowering stage, a pot experiment was conducted using Xiangzaoxian 24 rice. The changes of Cd content in rice grains and various organ species, and essential elements（K, Mg, Ca, Fe, Mn, Zn）and amino acid contents in rice were analyzed. The results show that the application of 0.8 mmol·L-1 chlorinated amino acetic acid at the flowering stage of rice significantly reduced the Cd content in rice and rachis at the mature stage; the Cd content in rice decreased from 0.28 mg·kg-1 to 0.17 mg·kg-1, reducing by 39.29%. Through the analysis of the cadmium transfer factor between various organs in rice, we found that the application of chlorinated amino acetic acid significantly decreased the transport factor of Cd ions from the rachis to grain, panicle node to panicle neck, and from the second inverted node to the first inverted. Cd decreased significantly due to the decrease in the transport efficiency of the inverted second internode. Additionally, the application of chlorinated amino acetic acid increased the content of Ca in grain and cob, and promoted the transfer of K, Mg and Zn from the inverted node to the rachis. The amino acid analysis results show that the application of 0.8 mmol·L-1 chlorinated amino acetic acid increased the content of aspartic acid and glutamic acid by 28.54% and 22.96%, respectively, and decreased the glycine content by 51.92%. Therefore, the application of chlorinated amino acetic acid during the flowering period of rice is conducive to the synthesis of aspartic acid and glutamic acid in rice, which promotes the transport of K, Mg and Zn, and significantly reduces Cd content by inhibiting the transportation of Cd from vegetative organs to grain. This method may be applied in the production process of Cd-polluted farmland in southern China. |
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