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<p>The toxicity of aluminum (Al) in acidic soils impairs plant growth, however silicon (Si) can attenuate this toxic effect. Here we&#xa0;investigate the short-term effects of Si as an attenuator of Al toxicity in popcorn (<i>Zea mays</i>) root tips. The presence of Al reduced the root growth rate. However, Si alleviated the inhibition of root elongation. Furthermore, Si reduced the Al concentration in the roots, indicating its ability to bind to Al in the nutrient solution through the hydroxyaluminosilicate complex, and consequently reducing the absorption of this toxic metal by the plants. The morphoanatomical analysis of the roots revealed that Si attenuated the alterations induced by Al, such as the increase in the radial diameter of the root tip, desquamation of the root apex cells and disorganization of the epidermal cells. These changes suggest that Si benefits the morphology of roots exposed to Al. The addition of Si resulted in increases in the root tip concentrations of fructose, sucrose, total amino acids and nitrate. Aditionally, Si-treated plants exhibited a lower lipid peroxidation and higher cell wall&#xa0;peroxidase activity. These results highlight the beneficial potential of Si fertilization as a strategy to improve crop development in acidic soils and mitigate the effects of Al toxicity.</p>

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Silicon supplementation enhances the tolerance of popcorn maize plants to aluminum toxicity

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Camila Hatsu Pereira Yoshida,
  • Allan de Marcos Lapaz,
  • Fabrício Ávila de Rodrigues,
  • Wagner Luiz Araújo,
  • Auxiliadora Oliveira Martins,
  • Ana Claudia Pacheco,
  • Cleberson Ribeiro

摘要

The toxicity of aluminum (Al) in acidic soils impairs plant growth, however silicon (Si) can attenuate this toxic effect. Here we investigate the short-term effects of Si as an attenuator of Al toxicity in popcorn (Zea mays) root tips. The presence of Al reduced the root growth rate. However, Si alleviated the inhibition of root elongation. Furthermore, Si reduced the Al concentration in the roots, indicating its ability to bind to Al in the nutrient solution through the hydroxyaluminosilicate complex, and consequently reducing the absorption of this toxic metal by the plants. The morphoanatomical analysis of the roots revealed that Si attenuated the alterations induced by Al, such as the increase in the radial diameter of the root tip, desquamation of the root apex cells and disorganization of the epidermal cells. These changes suggest that Si benefits the morphology of roots exposed to Al. The addition of Si resulted in increases in the root tip concentrations of fructose, sucrose, total amino acids and nitrate. Aditionally, Si-treated plants exhibited a lower lipid peroxidation and higher cell wall peroxidase activity. These results highlight the beneficial potential of Si fertilization as a strategy to improve crop development in acidic soils and mitigate the effects of Al toxicity.