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| The effects of exogenous spermidine on the cadmium and arsenic uptake and accumulation in rice |
| Received:July 19, 2020 |
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| KeyWord:spermidine;rice;cadmium;arsenic;farmland heavy metal pollution |
| Author Name | Affiliation | E-mail | | LIU Shu-jin | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | HUANG Yi-zong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | yizonghuang@126.com | | LI Yan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WEI Xiang-dong | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | TIE Bai-qing | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | |
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| Abstract: |
| Hydroponic and field experiments were performed to investigate the effects of exogenous spermidine(Spd)on the absorption and accumulation of cadmium(Cd)and arsenic(As)in rice. In the hydroponic experiment, under 10 μmol·L-1 Cd stress and the exogenous addition of 250 μmol·L-1 Spd, the rice stem and leaf Cd contents were significantly reduced(58.0%). Under 50 μmol·L-1 Cd stress and an equivalent Spd concentration, the stem and leaf As contents were significantly reduced(20.1%), and the transport of Cd and As from the root to the stems and leaves(and subsequent accumulation)was prevented. In the field experiment, 1 000 μmol·L-1 Spd significantly reduced the root, leaf, and grain Cd accumulation by 25.8%, 51.9%, and 37.4%, respectively, and the stem and root As contents were reduced by 23.9% and 31.2%, respectively. These results support prior studies showing that the exogenous application of spermidine reduced the absorption and accumulation of Cd and As in rice at the seedling stage, and significantly reduced the Cd content in rice grains. Therefore, spermidine can be used to alleviate rice Cd and As stress and improve food security. |
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