砷-铅交互作用对水稻根表铁膜富集及根系吸收砷铅的影响
Effects of arsenic and lead interaction on arsenic and lead accumulation in iron plaque and uptake by rice roots
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摘要: 采用土-砂联合培养方法诱导水稻根表自然形成铁氧化物膜,研究了As-Pb交互作用对水稻根表铁膜吸附砷铅及根系吸收As和Pb的影响.结果表明,As和Pb的添加显著地影响水稻根表铁膜对As和Pb的吸附,并且As-Pb交互作用显著地影响水稻根系对两元素的吸收及根表铁膜对As的吸附.添加Pb可促进水稻根系对As的吸收.当As浓度为25 μmol·L-1时,浓度为25 μmol·L-1 Pb处理与对照相比导致水稻根系吸收As提高了53.3%.同样,施用As也可以促进水稻根系对Pb的吸收,当Pb的浓度为25 μmol·L-1和50 μmol·L-1时,50 μmol·L-1 As处理与对照相比,水稻根系吸收Pb分别提高20.2%和28.6%.添加As显著地促进Pb由铁膜向根系中转运,而添加Pb对As由铁膜向根系中的转运影响不大.因此,在重金属复合污染情况下,水稻根表铁膜对重金属的吸附及根系对重金属的吸收均存在着复杂的交互作用.Abstract: Iron plaque on the surface of rice roots formed naturally by soil-quartz sand culture. Interactive effects between As and Pb on As and Pb uptake by rice roots and accumulation in iron plaque were investigated. The results showed that As and Pb accumulations in iron plaque were significantly affected by As and Pb addition, and the interaction between As and Pb had significant effects on the uptake of these two elements by rice roots and As accumulation in iron plaque. Pb addition enhanced the As uptake by rice roots. When rice plants were treated with 25 μmol·L-1 As, 25 μmol·L-1 Pb addition increased As uptake by 53.3% compared with Pb control treatment. Similarly, As addition also enhanced Pb uptake by rice roots. When rice plants were treated with 25 and 50 μmol·L-1 Pb, 50 μmol·L-1 As addition increased Pb uptake by 20.2% and 28.6% respectively compared with As control treatment. As also enhanced the translocation of Pb from iron plaque to roots, but the translocation of As from iron plaque to roots was not affected significantly by Pb. This study implies that the complex interactions among heavy metal might exist under co-contaminated conditions, and the interaction could affect the heavy metal uptake by rice roots and their accumulation in iron plaque.
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Key words:
- rice /
- iron plaque /
- As /
- Pb /
- interaction
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