Scholarlink

<p>Cadmium contamination in paddy soils threatens rice production and food safety. Silicon-based foliar treatments have shown potential to reduce cadmium transfer to grain, but field-applicable strategies with stable performance remain limited. This study evaluated whether a commercial nanosilica fertilizer applied alone or in combination with polyethyleneimine could reduce cadmium accumulation and improve the physiological and agronomic performance of rice grown in severely cadmium-contaminated soil. Pot and field experiments were conducted using the same contaminated soil. Foliar treatments included the nanosilica fertilizer alone and the nanosilica fertilizer combined with polyethyleneimine at 0.001, 0.003, and 0.005 g L⁻¹, applied at the tillering, booting, and grain-filling stages. Cadmium concentrations in different tissues, chlorophyll status, antioxidant responses, oxidative stress indicators, agronomic traits, grain-quality indices, and yield were assessed. Relative to the control, all foliar treatments improved plant performance and reduced cadmium accumulation in leaves, husks, panicle axes, and grains. Grain cadmium decreased by 10.1–42.6% in the field and 25.1–49.9% in the pot experiment. The largest reduction in field grain cadmium was observed in the 0.001 g L⁻¹ polyethyleneimine treatment, whereas the 0.003 g L⁻¹ treatment showed the best overall performance across most physiological, agronomic, and grain-quality traits. This treatment improved leaf chlorophyll status, increased superoxide dismutase and catalase activities, lowered hydrogen peroxide and malondialdehyde contents, and enhanced plant height, stem diameter, panicle length, root biomass, yield components, final yield, crude protein, and total starch. These results indicate that polyethyleneimine-assisted nanosilica foliar application is a promising approach for reducing grain cadmium while maintaining rice performance in cadmium-contaminated paddy systems. The observed tissue-level cadmium redistribution and physiological responses were consistent with reduced transfer of cadmium to reproductive tissues, but the present study provides outcome-based evidence rather than direct mechanistic confirmation. Further work is needed to clarify the underlying processes, environmental safety, and the treatment-specific contribution of polyethyleneimine.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Regulation of Cadmium Uptake and Agronomic Traits in Rice by PEI-Induced Nanosilica Deposition

  • 期刊论文

  • 发表日期：

    2026年5月4日

查看全文
  • Xiao Tian,
  • Yingming Feng,
  • Xingyun Chen,
  • Tao Wan,
  • Chaozheng Huang,
  • Xuewen Li,
  • Sergey Shabala,
  • Min Yu

摘要

Cadmium contamination in paddy soils threatens rice production and food safety. Silicon-based foliar treatments have shown potential to reduce cadmium transfer to grain, but field-applicable strategies with stable performance remain limited. This study evaluated whether a commercial nanosilica fertilizer applied alone or in combination with polyethyleneimine could reduce cadmium accumulation and improve the physiological and agronomic performance of rice grown in severely cadmium-contaminated soil. Pot and field experiments were conducted using the same contaminated soil. Foliar treatments included the nanosilica fertilizer alone and the nanosilica fertilizer combined with polyethyleneimine at 0.001, 0.003, and 0.005 g L⁻¹, applied at the tillering, booting, and grain-filling stages. Cadmium concentrations in different tissues, chlorophyll status, antioxidant responses, oxidative stress indicators, agronomic traits, grain-quality indices, and yield were assessed. Relative to the control, all foliar treatments improved plant performance and reduced cadmium accumulation in leaves, husks, panicle axes, and grains. Grain cadmium decreased by 10.1–42.6% in the field and 25.1–49.9% in the pot experiment. The largest reduction in field grain cadmium was observed in the 0.001 g L⁻¹ polyethyleneimine treatment, whereas the 0.003 g L⁻¹ treatment showed the best overall performance across most physiological, agronomic, and grain-quality traits. This treatment improved leaf chlorophyll status, increased superoxide dismutase and catalase activities, lowered hydrogen peroxide and malondialdehyde contents, and enhanced plant height, stem diameter, panicle length, root biomass, yield components, final yield, crude protein, and total starch. These results indicate that polyethyleneimine-assisted nanosilica foliar application is a promising approach for reducing grain cadmium while maintaining rice performance in cadmium-contaminated paddy systems. The observed tissue-level cadmium redistribution and physiological responses were consistent with reduced transfer of cadmium to reproductive tissues, but the present study provides outcome-based evidence rather than direct mechanistic confirmation. Further work is needed to clarify the underlying processes, environmental safety, and the treatment-specific contribution of polyethyleneimine.

Graphical Abstract