Does radial oxygen loss and iron plaque formation on roots alter Cd and Pb uptake and distribution in rice plant tissues?

Hao CHENG, Maoyi WANG, Ming Hung WONG, Zhihong YE

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Abstract

Background and Aims Metal (e.g. Cd and Pb) pollution in agricultural soils and crops have aroused considerable attention in recent years. This study aimed to evaluate the effects of ROL and Fe plaque on Cd and Pb accumulation and distribution in the rice plant.

Methods A rhizobag experiment was employed to investigate the correlations among radial oxygen loss (ROL), Fe plaque formation and uptake and distribution of Cd and Pb in 25 rice cultivars.

Results Large differences between the cultivars were found in rates of ROL (1.55 to 6.88 mmol O2 kg−1 root d.w. h−1), Fe plaque formation (Fe: 6,117–48,167 mg kg−1; Mn: 127–1,089 mg kg−1), heavy metals in shoot (Cd: 0.13–0.35 mg kg−1; Pb: 4.8–8.1 mg kg−1) and root tissues (Cd: 1.1–3.5 mg kg−1; Pb: 45–199 mg kg−1), and in Fe plaque (Cd: 0.54–2.6 mg kg−1; Pb: 102–708 mg kg−1). Rates of ROL were positively correlated with Fe plaque formation and metal deposition on root surfaces, but negatively correlated with metal transfer factors of root/plaque and distributions in shoot and root tissues.

Conclusions ROL-induced Fe plaque promotes metal deposition on to root surfaces, leading to a limitation of Cd and Pb transfer and distribution in rice plant tissues. Copyright © Springer Science+Business Media Dordrecht 2013.
Original languageEnglish
Pages (from-to)137-148
JournalPlant and Soil
Volume375
Issue number1-2
Early online date27 Oct 2013
DOIs
Publication statusPublished - Feb 2014

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plant tissues
rice
iron
oxygen
metals
cultivar
metal
shoot
shoots
cultivars
agricultural soils
agricultural soil
loss
distribution
tissue
heavy metals
pollution
heavy metal
crop
crops

Citation

Cheng, H., Wang, M., Wong, M. H., & Ye, Z. (2014). Does radial oxygen loss and iron plaque formation on roots alter Cd and Pb uptake and distribution in rice plant tissues? Plant and Soil, 375(1-2), 137-148.

Keywords

  • Cadmium
  • Iron plaque
  • Lead
  • Radial oxygen loss
  • Rice