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Background and aims <p>Arsenic (As) contamination in paddy soil threatens human health and the iron (Fe) plaques on rice root surface can effectively prevent As uptake by rice. Seedling-transplantation is an important rice farming model worldwide, and forming Fe plaques during the seedling is unavoidable. As an important participant during the Fe cycling in the rhizosphere, the Fe plaques carried by seedlings may influence ‘new’ Fe plaque formation, thereby limiting arsenic uptake by rice.</p> Methods <p>The rice seedlings carrying or not carrying Fe plaques were grown in pot and hydroponic experiments to systematically investigate the effects of seedling-carried Fe plaques (‘old’ Fe plaques) (IP treatment) on ‘new’ Fe plaque formation and As accumulation.</p> Results <p>The results showed that ‘old’ Fe plaques reduced the As content in rice tissues compared to the non-carried Fe plaques treatment (CK treatment), in which the As content in brown rice was reduced by 6.4–17.2%. The Fe and As contents in Fe plaques were 66.2–134.0% and 13.1–75.8% higher in IP treatments than in CK treatment in the different rice growth stage. The <i>FOB</i> and <i>aioA</i>/<i>aioB</i> gene abundances were higher in IP treatment than in CK treatment, and the K-edge XAFS of As indicated ‘old’ of Fe plaques promoted As oxidation. Furthermore, the reactive oxygen species (·O<sub>2</sub><sup>−</sup> and ·OH) around the roots were higher in IP treatment than in CK treatment. Overall, seedling-carried Fe plaque inhibited As uptake by rice via promoting ‘new’ Fe plaque formation, the findings provide a new insight into a technical model for the safe production in As contaminated paddy.</p>

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Assessing the potential of seedling-carried iron plaques on root to reduce As accumulation in rice: insights from the biotic/abiotic role of 'new' iron plaques formation

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Xin Zhang,
  • Hongqing Hu,
  • Fei Miao,
  • Mengxi Feng,
  • Linchuan Fang,
  • Jun Zhu,
  • Qingling Fu

摘要

Background and aims

Arsenic (As) contamination in paddy soil threatens human health and the iron (Fe) plaques on rice root surface can effectively prevent As uptake by rice. Seedling-transplantation is an important rice farming model worldwide, and forming Fe plaques during the seedling is unavoidable. As an important participant during the Fe cycling in the rhizosphere, the Fe plaques carried by seedlings may influence ‘new’ Fe plaque formation, thereby limiting arsenic uptake by rice.

Methods

The rice seedlings carrying or not carrying Fe plaques were grown in pot and hydroponic experiments to systematically investigate the effects of seedling-carried Fe plaques (‘old’ Fe plaques) (IP treatment) on ‘new’ Fe plaque formation and As accumulation.

Results

The results showed that ‘old’ Fe plaques reduced the As content in rice tissues compared to the non-carried Fe plaques treatment (CK treatment), in which the As content in brown rice was reduced by 6.4–17.2%. The Fe and As contents in Fe plaques were 66.2–134.0% and 13.1–75.8% higher in IP treatments than in CK treatment in the different rice growth stage. The FOB and aioA/aioB gene abundances were higher in IP treatment than in CK treatment, and the K-edge XAFS of As indicated ‘old’ of Fe plaques promoted As oxidation. Furthermore, the reactive oxygen species (·O2− and ·OH) around the roots were higher in IP treatment than in CK treatment. Overall, seedling-carried Fe plaque inhibited As uptake by rice via promoting ‘new’ Fe plaque formation, the findings provide a new insight into a technical model for the safe production in As contaminated paddy.