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Background and aims <p>Selenium (Se) deficiency in humans is a widespread global concern, enabling the need for agronomic biofortification of staple crops like rice.</p> Methods <p>A pot culture was performed to analyze the effect of soil Se application on soil bacterial community, iron plaque formation, Se concentration in iron plaque and plant tissues, and grain Se species and nutrient element accumulation.</p> Results <p>Soil Se application significantly increased grain Se concentration by regulating two key processes. First, stepwise regression identified the soil-to-root bioconcentration factor (BCF)&#xa0;as the crucial predictor for grain Se accumulation. Iron plaque acted as a&#xa0;dynamic reservoir–despite increased Se concentration in iron plaque, the proportion of Se retained in the plaque decreased while Se allocation to the shoot increased. Second, structural equation modeling identified shoot Se as the primary driver of grain accumulation, with the first node functioning as a central hub for Se storage and redistribution. Furthermore, Se was predominantly converted into organic species–seleno-methionine, but it also induced an antagonistic effect on grain iron accumulation. Notably, Se application had little effect on soil bacterial community structure.</p> Conclusion <p>Soil–to–root bioconcentration, mediated by iron plaque as a dynamic reservoir, is the rate–limiting step for grain Se accumulation, with the shoot (first node) serving as the redistribution hub.</p>

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Effect of soil applied selenite on selenium and iron accumulation in rice

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Xiaotong Huang,
  • Zhuorui Yang,
  • Yunying Peng,
  • Yuebing Sun,
  • Qingqing Huang,
  • Xuerong Di

摘要

Background and aims

Selenium (Se) deficiency in humans is a widespread global concern, enabling the need for agronomic biofortification of staple crops like rice.

Methods

A pot culture was performed to analyze the effect of soil Se application on soil bacterial community, iron plaque formation, Se concentration in iron plaque and plant tissues, and grain Se species and nutrient element accumulation.

Results

Soil Se application significantly increased grain Se concentration by regulating two key processes. First, stepwise regression identified the soil-to-root bioconcentration factor (BCF) as the crucial predictor for grain Se accumulation. Iron plaque acted as a dynamic reservoir–despite increased Se concentration in iron plaque, the proportion of Se retained in the plaque decreased while Se allocation to the shoot increased. Second, structural equation modeling identified shoot Se as the primary driver of grain accumulation, with the first node functioning as a central hub for Se storage and redistribution. Furthermore, Se was predominantly converted into organic species–seleno-methionine, but it also induced an antagonistic effect on grain iron accumulation. Notably, Se application had little effect on soil bacterial community structure.

Conclusion

Soil–to–root bioconcentration, mediated by iron plaque as a dynamic reservoir, is the rate–limiting step for grain Se accumulation, with the shoot (first node) serving as the redistribution hub.