The effects of radial oxygen loss on arsenic tolerance and uptake in rice and on its rhizosphere

X. Q. Mei, Ming Hung WONG, Y. Yang*, H. Y. Dong, R. L. Qiu, Z. H. Ye

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

106 Citations (Scopus)


Understanding the complex biotic and abiotic interactions invoked by the rice root system in oxygen-depleted soil is an important step in screening genotypes for low toxic metal or metalloid accumulation. A hydroponic and a rhizobox experiment have been conducted to explore the effects of varying root oxygen release on chemical changes, As fractionation in rhizosphere soil and Fe plaque formation, As uptake and tolerance by different rice genotypes. The results showed that rice genotypes with higher rates of radial oxygen loss (ROL) and at the bolting stage, tended to have greater effects on rhizosphere Eh, pH, Fe 3+/Fe 2+ quotients, As fractionation and mobility and also on Fe plaque formation compared to those with lower ROL and at the tillering stage. Genotypes with higher ROL have a strong ability to reduce As accumulation in shoots and increase As tolerance by reducing As mobilization in the rhizosphere and by limiting As translocation.

Original languageEnglish
Pages (from-to)109-117
Number of pages9
JournalEnvironmental Pollution
Publication statusPublished - Jun 2012

Scopus Subject Areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

User-Defined Keywords

  • As fractions
  • As tolerance
  • Fe plaque
  • Oryza sativa L.
  • Radial oxygen loss (ROL)
  • Rhizosphere soil


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