Dynamic changes in radial oxygen loss and iron plaque formation and their effects on Cd and As accumulation in rice (Oryza sativa L.)

Xun WANG, Haixin YAO, Ming Hung WONG, Zhihong YE

Research output: Contribution to journalArticlespeer-review

29 Citations (Scopus)

Abstract

Temporal variations and correlations between radial oxygen loss (ROL), iron (Fe) plaque formation, cadmium (Cd) and arsenic (As) accumulation were investigated in two rice cultivars at four different growth stages based upon soil pot and deoxygenated solution experiments. The results showed that there were significant differences in ROL (1.1–16 μmol O2 plant−1 h−1), Fe plaque formation (4,097–36,056 mg kg−1), Cd and As in root tissues (Cd 77–162 mg kg−1; As 49–199 mg kg−1) and Fe plaque (Cd 0.4–24 mg kg−1; As 185–1,396 mg kg−1) between these growth stages. ROL and Fe plaque increased dramatically from tillering to ear emergence stages and then were much reduced at the grain-filling stage. Furthermore, significantly positive correlations were detected between ROL and concentrations of Fe, Cd and As in Fe plaque. Our study indicates that increased Fe plaque forms on rice roots at the ear emergence stage due to the increased ROL. This stage could therefore be an important period to limit the transfer and distribution of Cd and As in rice plants when growing in soils contaminated with these toxic elements. Copyright © 2013 Springer Science+Business Media Dordrecht.
Original languageEnglish
Pages (from-to)779-788
JournalEnvironmental Geochemistry and Health
Volume35
Issue number6
Early online dateJun 2013
DOIs
Publication statusPublished - Dec 2013

Citation

Wang, X., Yao, H., Wong, M. H., & Ye, Z. (2013). Dynamic changes in radial oxygen loss and iron plaque formation and their effects on Cd and As accumulation in rice (Oryza sativa L.). Environmental Geochemistry and Health, 35(6), 779-788. doi: 10.1007/s10653-013-9534-y

Keywords

  • Iron plaque
  • Dynamic changes
  • Rice
  • Cadmium
  • Arsenic

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