The effect of silicon on iron plaque formation and arsenic accumulation in rice genotypes with different radial oxygen loss (ROL).
The effect of silicon on iron plaque formation and arsenic accumulation in rice genotypes with different radial oxygen loss (ROL).
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DOI：
10.1016/j.envpol.2016.01.004
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发表时间：
2016-05
影响因子：
8.9
通讯作者：
Chuan Wu;Qi Zou;Sheng-guo Xue;Wei-song Pan;Liu Huang;W. Hartley;Jing-yu Mo;M. Wong
中科院分区：
文献类型：
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作者：
Chuan Wu;Qi Zou;Sheng-guo Xue;Wei-song Pan;Liu Huang;W. Hartley;Jing-yu Mo;M. Wong
水稻是人类食物链中砷暴露的主要途径之一，威胁着全球一半以上的人口。采用温室盆栽试验，研究了施硅对不同径向耗氧能力的籼稻和杂交稻水稻铁膜形成、砷吸收及籽粒砷形态的影响。结果表明，硅显著增加根系和籽粒生物量。具有较高ROL的籼稻基因型诱导更大的铁菌斑形成，相比杂交基因型和螯合更多的铁菌斑。施硅显著提高了不同基因型水稻铁膜中的铁含量，但使水稻根、秸秆和谷壳中的砷含量分别降低了28- 35%、15-35%和32-57%。此外，它显着降低DMA积累的水稻籽粒，但不无机砷积累。高ROL的籼稻基因型籽粒无机砷积累量低于低ROL的杂交水稻基因型。
Rice is one of the major pathways of arsenic (As) exposure in human food chain, threatening over half of the global population. Greenhouse pot experiments were conducted to examine the effects of Si application on iron (Fe) plaque formation, As uptake and rice grain As speciation in indica and hybrid rice genotypes with different radial oxygen loss (ROL) ability. The results demonstrated that Si significantly increased root and grain biomass. Indica genotypes with higher ROL induced greater Fe plaque formation, compared to hybrid genotypes and sequestered more As in Fe plaque. Silicon applications significantly increased Fe concentrations in iron plaque of different genotypes, but it decreased As concentrations in the roots, straws and husks by 28–35%, 15–35% and 32–57% respectively. In addition, it significantly reduced DMA accumulation in rice grains but not inorganic As accumulation. Rice of indica genotypes with higher ROL accumulated lower concentrations of inorganic As in grains than hybrid genotypes with lower ROL.