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| Effects of glutathione foliar application on Cd and mineral elements in rice |
| Received:February 08, 2022 |
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| KeyWord:glutathione;rice;Cd;mineral element;foliar application |
| Author Name | Affiliation | E-mail | | LIU Yaping | School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
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 | wangchangrong109@163.com | | REN Xinghua | Xiangtan Agricultural Science Research Institute, Xiangtan 411134, China | | | LIU Yuemin | School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China | lyuemn@126.com | | HUANG Yongchun | 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 | | | 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 | |
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| Abstract: |
| To evaluate the feasibility of glutathione(GSH)as a foliar conditioner for Cd reduction in rice, field experiments in Hunan province were conducted to study the effects of GSH foliar application on the concentration of Cd and mineral elements in different rice organs, and the Cd reduction mechanisms of GSH application on rice were explored. The results showed that foliar application of GSH at rice flowering stage significantly decreased Cd concentration in grains, with a maximum decrease of 76.5%, from 0.449 mg·kg-1 to less than 0.2 mg·kg-1, which is the food safety standard in China. In rice grains, GSH spraying significantly increased the concentration of mineral elements such as K, Mg, Ca, and Mn. Under GSH treatment, the Cd concentration in all vegetative organs of rice significantly decreased by 68.8%~86.7%. The mineral elements K, Mg, Ca, Fe, Mn, and Zn in different organs also increased or decreased in different degrees. Element transfer factors between different adjacent organs showed that GSH application increased the transfer factors of Cd and Zn from second internodes to panicle nodes by 46.2% and 134.4%, respectively; while decreased those from flag leaves to panicle nodes by 44.5% and 32.2%, respectively. However, Cd transfer factor from panicle nodes to panicle neck decreased by 31.4%. Correlation analysis showed that among the mineral elements detected, Zn concentration had the highest correlation coefficient(0.809, P<0.001)with Cd concentration in rice vegetative organs. Therefore, foliar application of GSH not only inhibited Cd accumulation in rice organs but also improved the Cd interception ability of panicle nodes, the main Cd blocking organ of rice, by regulating the Cd transport between the panicle nodes and its adjacent vegetative organs, including panicle necks, flag leaves, and second internodes. In addition, GSH application improved the Zn fixation ability of panicle nodes and affected the concentration and distribution of mineral elements in rice organs. Among the mineral elements detected, Zn had the highest correlation with Cd. |
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