The effect of silicon on iron plaque formation and arsenic accumulation in rice genotypes with different radial oxygen loss (ROL)

Chuan WU, Qi ZOU, Sheng-Guo XUE, Wei-Song PAN, Liu HUANG, William HARTLEY, Jing-Yu MO, Ming Hung WONG

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

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. Copyright © 2016 Elsevier Ltd.
Original languageEnglish
Pages (from-to)27-33
JournalEnvironmental Pollution
Volume212
Early online dateFeb 2016
DOIs
Publication statusPublished - May 2016

Citation

Wu, C., Zou, Q., Xue, S.-G., Pan, W.-S., Huang, L., Hartley, W., et al. (2016). The effect of silicon on iron plaque formation and arsenic accumulation in rice genotypes with different radial oxygen loss (ROL). Environmental Pollution, 212, 27-33.

Keywords

  • Arsenic
  • Iron plaque
  • Radial oxygen loss
  • Rice
  • Silicon

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