Do radial oxygen loss and external aeration affect iron plaque formation and arsenic accumulation and speciation in rice?
Do radial oxygen loss and external aeration affect iron plaque formation and arsenic accumulation and speciation in rice?
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DOI：
10.1093/jxb/ers017
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发表时间：
2012-05
影响因子：
6.9
通讯作者：
Wong M
中科院分区：
文献类型：
--
作者：
Wu C;Ye Z;Li H;Wu S;Deng D;Zhu Y;Wong M
采用水培试验研究了径向缺氧（ROL）和外部通气对水稻（Oryza sativa L.）铁（Fe）膜形成、砷（As）积累和形态转化的影响。结果表明，不同基因型水稻上产生的铁膜中的铁含量与ROL之间存在显著的相关性。在不同通气条件下（通气、正常通气和静止通气），不同基因型根的不同部位形成的铁膜量也存在显著差异。在曝气处理，水稻往往有更高的铁斑块形成比在一个停滞的解决方案，最大的形成在根尖随着距离的增加而减少，按照空间ROL的趋势。具有较高ROL率的基因型诱导较高程度的铁斑块形成。菌斑螯合砷对水稻根，砷几乎是两倍，砷，导致减少砷积累在根和芽。砷在根和芽中的主要形态是亚砷酸盐，在不同处理和基因型中占总砷的34%~ 78%。这些结果有助于我们理解水稻吸收砷的基因型差异和机制，使水稻基因型具有较高的ROL，以显示较低的整体砷积累。
Hydroponic experiments were conducted to investigate the effect of radial oxygen loss (ROL) and external aeration on iron (Fe) plaque formation, and arsenic (As) accumulation and speciation in rice (Oryza sativa L.). The data showed that there were significant correlations between ROL and Fe concentrations in Fe plaque produced on different genotypes of rice. There were also significant differences in the amounts of Fe plaque formed between different genotypes in different positions of roots and under different aeration conditions (aerated, normal, and stagnant treatments). In aerated treatments, rice tended to have a higher Fe plaque formation than in a stagnant solution, with the greatest formation at the root tip decreasing with increasing distances away, in accordance with a trend of spatial ROL. Genotypes with higher rates of ROL induced higher degrees of Fe plaque formation. Plaques sequestered As on rice roots, with arsenate almost double that with arsenite, leading to decreased As accumulation in both roots and shoots. The major As species detected in roots and shoots was arsenite, ranging from 34 to 78% of the total As in the different treatments and genotypes. These results contribute to our understanding of genotypic differences in As uptake by rice and the mechanisms causing rice genotypes with higher ROL to show lower overall As accumulation.
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影响因子：
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