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Aims <p>Arsenic (As) contamination in agricultural soils threatens rice productivity and food safety, particularly in South and Southeast Asia. This study aimed to evaluate early vegetative growth dynamics of nine rice cultivars grown in soil under varying As stress and assess the mitigating roles of silicon (Si) and selenium (Se).</p> Methods <p>Nine rice cultivars were grown in soil under varying As levels, with and without Si or Se supplementation, over 10–64&#xa0;days. Growth responses, quantified as shoot elongation, were analyzed using longitudinal growth-curve modelling to identify cultivar-specific patterns and treatment effects.</p> Results <p>Arsenic significantly reduced shoot elongation across cultivars in a dose and time dependent manner. Both Si and Se alleviated these effects, although efficacy varied with cultivar and developmental stage. Growth modelling revealed distinct regimes—quadratic, Gompertz, and logistic, indicating intrinsic differences in growth behaviour and stress response. In the quadratic regime, As primarily affected baseline growth, with Si/Se showing additive effects. Gompertz type cultivars exhibited strong interaction effects, suggesting dynamic, dose-dependent mitigation, with Si generally more effective. The logistic regime showed intermediate responses, where As influenced all growth parameters while treatments improved overall growth without altering dynamics of shoot elongation. These regimes aligned with genotype-specific As tolerance, distinguishing high-yielding varieties, aromatic landraces, and basmati types.</p> Conclusions <p>Integrating soil-based experimentation with growth regime classification provides deeper insight into As tolerance beyond endpoint analyses. Si and Se show strong potential for mitigating As stress and enabling targeted agronomic strategies in affected agroecosystems.</p>

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Longitudinal modelling of rice growth dynamics under arsenic stress: cultivar-specific regimes and responses to silicon/selenium supplementation

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Susmita Das,
  • Swarupa De,
  • Ishika Das,
  • Pabitra Banik,
  • Abhik Ghosh

摘要

Aims

Arsenic (As) contamination in agricultural soils threatens rice productivity and food safety, particularly in South and Southeast Asia. This study aimed to evaluate early vegetative growth dynamics of nine rice cultivars grown in soil under varying As stress and assess the mitigating roles of silicon (Si) and selenium (Se).

Methods

Nine rice cultivars were grown in soil under varying As levels, with and without Si or Se supplementation, over 10–64 days. Growth responses, quantified as shoot elongation, were analyzed using longitudinal growth-curve modelling to identify cultivar-specific patterns and treatment effects.

Results

Arsenic significantly reduced shoot elongation across cultivars in a dose and time dependent manner. Both Si and Se alleviated these effects, although efficacy varied with cultivar and developmental stage. Growth modelling revealed distinct regimes—quadratic, Gompertz, and logistic, indicating intrinsic differences in growth behaviour and stress response. In the quadratic regime, As primarily affected baseline growth, with Si/Se showing additive effects. Gompertz type cultivars exhibited strong interaction effects, suggesting dynamic, dose-dependent mitigation, with Si generally more effective. The logistic regime showed intermediate responses, where As influenced all growth parameters while treatments improved overall growth without altering dynamics of shoot elongation. These regimes aligned with genotype-specific As tolerance, distinguishing high-yielding varieties, aromatic landraces, and basmati types.

Conclusions

Integrating soil-based experimentation with growth regime classification provides deeper insight into As tolerance beyond endpoint analyses. Si and Se show strong potential for mitigating As stress and enabling targeted agronomic strategies in affected agroecosystems.