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mesheuropmc: food and beverages
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.
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    • Abedin, M. J., Meharg, A. A., 2002. Relative toxicity of arsenite and arsenate on germination and early seedling growth of rice (Oryza sativa L.). Plant. Soil. 243 (1), 57−66.
    • Abedin, M.J., Feldmann, J., Meharg, A.A., 2002. Uptake kinetics of arsenic species in rice plants. Plant Physiol. 128 (3), 1120-1128.
    • Calatayud, M., Bralatei, E., Feldmann, J., Devesa, V., Vélez, D., 2013.
    • Transformation of arsenic species during in vitro gastrointestinal digestion of vegetables. J. Agr. Food Chem. 61, 12164-12170.
    • Chen, X.W., Li, H., Chan, W.F., Wu, C., Wu, F.Y., Wu, S.C., Wong, M.H., 2012.
    • Chemosphere 89, 1248-1254.
    • Chen, X.W., Wu, F.Y., Li, H., Chan, W.F., Wu, C., Wu, S.C., Wong, M.H., 2013.
    • Environ. Exp. Bot. 87, 92-99.
    • Chen, Z., Zhu, Y.G., Liu, W.j., Meharg, A.A., 2005. Direct evidence showing the effect of root surface iron plaque on arsenite and arsenate uptake into rice (Oryza
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