Abstract
Background and aims
Limited information is available on comparing the iron plaque formation capabilities and their effect on arsenic (As) uptake by different rice plant genotypes grown in As-contaminated soils. This study investigates the effect of iron plaque on As uptake in different rice genotypes grown in As-contaminated soils from the Guandu Plain of northern Taiwan.
Methods
Twenty-eight rice genotypes including 14 japonica and 14 indica genotypes were used in this study. Rice seedlings were grown in As-contaminated soils for 38 days. The iron plaque formed on the rice roots were extracted using dithionite–citrate–bicarbonate. The concentrations of As, Fe, and P in soil solutions, iron plaque, and plants were measured. The speciation of As in the root’s iron plaque was determined by As K-edge X-ray absorption near-edge structure spectroscopy (XANES).
Results
The amounts of iron plaque formation on roots were significantly different among 28 tested rice genotypes, and 75.7–92.8 % of As uptake from soils could be sequestered in iron plaque. However, there were no significant negative correlations between the amounts of Fe or As in the iron plaque and the content of As accumulated in rice plants of tested genotypes. XANES data showed that arsenate was the predominant As species in iron plaque, and there were difference in the distribution of As species among different rice genotypes.
Conclusions
The iron plaque can sequester most of As uptake from soils no matter what rice genotypes used in this study. However, the iron plaque alone did not control the extent of As accumulation in rice plants from As-contaminated soils among 28 tested rice genotypes. Low As uptake genotypes of rice selected from this study can be recommended to be grown in the As-contaminated soils.
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Acknowledgments
The financial support from the National Science Council, Executive Yuan, Taiwan (grant no. NSC-101-2313-B-002-012-MY3) is sincerely appreciated. The XANES studies reported here were performed at the NSRRC, Taiwan, under project no. 2012-2-045-1. The authors thank the staff at NSRRC for their assistance during the experiments.
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Responsible Editor: Fangjie Zhao.
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Syu, CH., Lee, CH., Jiang, PY. et al. Comparison of As sequestration in iron plaque and uptake by different genotypes of rice plants grown in As-contaminated paddy soils. Plant Soil 374, 411–422 (2014). https://doi.org/10.1007/s11104-013-1893-8
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DOI: https://doi.org/10.1007/s11104-013-1893-8