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| Foliar application of SAC reduces lead concentration in late rice grains by decreasing the translocation of lead from the roots to the above-ground parts |
| Received:July 31, 2020 |
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| KeyWord:rice;lead;S-allyl-L-cysteine;foliar application |
| Author Name | Affiliation | E-mail | | CHENG Liu-long | 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 | nylab@126.com | | ZHOU Gui-hua | Guangxi Lanchi Environment and Protection Science and Technology Co., LTD, Nanning 537000, China | mbs168@126.com | | LIU Zhong-qi | 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 | | | WANG Chang-rong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Xiao-li | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| In this paper, the effects of foliar application of S-allyl-L-cysteine(SAC)on Pb content and grain quality of late rice grain were studied to evaluate the feasibility of using SAC to reduce Pb content in the grain. A field experiment was carried out in a Pb-contaminated farmland in the main rice producing region of Guangxi Province, China. The local cultivar ‘Bai Xiang 139’ was selected as the experimental material and 0.05 mmol·L-1 and 0.4 mmol·L-1 SAC was sprayed once each at the booting and flowering stages, respectively. When SAC concentration reached 0.1 mmol·L-1, the Pb content in grain decreased significantly by 34.04%, but Pb content in grain did not show a continuous downward trend with increase in SAC spraying concentration. The results of analysis for the content of six essential nutrient elements in grains revealed that spraying SAC had no significant effect on the content of K, Mg, Ca, Fe, and Zn, but significantly reduced the content of Mn by 21.93%. The Pb content in all above-ground organs was significantly lower than that in the control after SAC spraying. As the spraying concentration of SAC increased, the Pb content in the upper vegetative organs also increased gradually, but there was no significant effect of spraying SAC on Pb content in the roots. After SAC spraying, the transfer coefficient of Pb from the root to the third internode(TFInternodeⅢ/Root)and from the third internode to the second node(TFNodeⅡ/InternodeⅢ)was significantly reduced, with the highest reduction of 29.77% and 24.25%, respectively. However, the transfer coefficient of Pb from the first node to the first internode (TFInternodeⅠ/NodeⅠ)and from the rachis to the grain(TFGrain/Rachis)and from the flag leaf to the grain(TFGrain/Flag leaf)significantly increased, with a maximum increase of 22.40%, 25.35% and 16.35%, respectively. It is suggested that the decrease in the grain Pb content as a result of SAC spraying may be related to the decrease in transport from roots to the basal organs of rice straw. |
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