Do radial oxygen loss and external aeration affect iron plaque formation and arsenic accumulation and speciation in rice?

Chuan Wu, Zhihong Ye, Hui Li, Shengchun Wu, Dan Deng, Yongguan Zhu, Ming Hung WONG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

93 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2961-2970
Number of pages10
JournalJournal of Experimental Botany
Volume63
Issue number8
DOIs
Publication statusPublished - May 2012

Scopus Subject Areas

  • Physiology
  • Plant Science

User-Defined Keywords

  • Arsenate
  • Arsenic (As)
  • Arsenite
  • Iron plaque
  • Radial oxygen loss
  • Rice
  • Spatial pattern of ROL

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