Insights into mechanism on organic acids assisted translocation of uranium in Brassica juncea var. foliosa by EXAFS
| Autor: | Yongdong Jin, Li Liu, Jianmei Wang, Sai Zhou, Siqun Tang, Yixuan Wu, Xiaojie Feng, Rulei Wu, Xiaoli Tan, Yu Fan, Chuanqin Xia |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Health Toxicology and Mutagenesis Brassica 010501 environmental sciences Plant Roots 01 natural sciences chemistry.chemical_compound Radiation Monitoring Environmental Chemistry Carboxylate Waste Management and Disposal 0105 earth and related environmental sciences chemistry.chemical_classification biology fungi food and beverages General Medicine Metabolism Uranyl biology.organism_classification Pollution Apoplast Lactic acid Plant Leaves chemistry Uranium Citric acid Mustard Plant Nuclear chemistry Organic acid |
| Zdroj: | Journal of Environmental Radioactivity. 218:106254 |
| ISSN: | 0265-931X |
| DOI: | 10.1016/j.jenvrad.2020.106254 |
| Popis: | Citric acid (CA) and Lactic acid (LA) were used as additives to study the mechanism of organic acid promoting the root-to-shoot translocation of uranium (U) in Brassica juncea var. foliosa from molecular and tissue levels. Firstly, the distribution of U in plants under the condition of different organic acids concentrations were studied. The accumulation of U in leafs of 1 mM CA group and 5 mM LA group reached 2225 and 1848 mg/kg respectively, which was about 5 times that of the control group. Secondly, the speciation and distribution of U in plant roots after exposure to different culture solutions were studied by EXAFS and SEM. The result of EXAFS found that the complex of U with organic acids resulted in the U accumulated in the roots was the uranyl carboxylate speciation, while the control group only was the uranyl phosphate speciation. SEM results showed that the lactic acids could enhanced the translocation of U from the cortex to the stele. Thirdly, we further studied the apoplastic pathway and the symplastic pathway of U translocation using transpiration inhibitor and metabolism inhibitor. Compared with the control group, it was likely that the complex of U with organic acids were translocated into the shoot of plants through the apoplastic pathway. |
| Databáze: | OpenAIRE |
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