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<p>Soil contamination by heavy metals, such as zinc, has significant environmental consequences. Phytoremediation, among various remediation techniques, has been developed and applied to restore contaminated soils. However, phytoremediation has limitations, especially related to slow plant growth. This issue is often influenced by the toxicity of contaminants. This study aims to investigate the interaction between zinc and silicon in oleander (<i>Nerium oleander</i>&#xa0;L.). Specifically, it examines the impact on growth, photosynthetic and biochemical behaviors, as well as the plant's phytoremediation capacity. Oleander plants were exposed to four treatments. These included two adequate zinc treatments (0.76 μM Zn) combined with two silicon concentrations (0 mM and 0.5 mM Si). Additionally, two zinc-toxic treatments (1800 μM Zn) were applied with the same silicon concentrations. The results demonstrated that zinc toxicity had detrimental effects on most of the measured parameters. However, the negative impacts were substantially alleviated by silicon supplementation. The application of silicon reduced leaf chlorosis and enhanced biomass production. It also increased photosynthetic pigment content, improved gas exchange, and maintained the oxidation state of photosystem I (PSI). Additionally, it preserved membrane integrity. Moreover, silicon influenced soluble protein levels and increased antioxidant enzyme activities. This was especially true for guaiacol peroxidase, which helped mitigate oxidative stress. Overall, silicon had beneficial effects on the phytoremediation capacity of <i>N. oleander</i>.&#xa0;Therefore, fertilization rich in silicon could represent an effective solution for enhancing the phytoremediation capacity of this species, minimizing one of the major disadvantages of phytoremediation, namely low biomass production influenced by toxicity.</p>

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Zinc Toxicity and Phytoremediation Potential of Oleander: How can Silicon Help?

  • 期刊论文

  • 发表日期：

    2025年1月21日

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  • Elkadri Lefi,
  • Hasna Ellouzi,
  • Khawla Atia,
  • Mohammed Falouti,
  • Mokded Rabhi,
  • Chedly Abdelly,
  • Walid Zorrig

摘要

Soil contamination by heavy metals, such as zinc, has significant environmental consequences. Phytoremediation, among various remediation techniques, has been developed and applied to restore contaminated soils. However, phytoremediation has limitations, especially related to slow plant growth. This issue is often influenced by the toxicity of contaminants. This study aims to investigate the interaction between zinc and silicon in oleander (Nerium oleander L.). Specifically, it examines the impact on growth, photosynthetic and biochemical behaviors, as well as the plant's phytoremediation capacity. Oleander plants were exposed to four treatments. These included two adequate zinc treatments (0.76 μM Zn) combined with two silicon concentrations (0 mM and 0.5 mM Si). Additionally, two zinc-toxic treatments (1800 μM Zn) were applied with the same silicon concentrations. The results demonstrated that zinc toxicity had detrimental effects on most of the measured parameters. However, the negative impacts were substantially alleviated by silicon supplementation. The application of silicon reduced leaf chlorosis and enhanced biomass production. It also increased photosynthetic pigment content, improved gas exchange, and maintained the oxidation state of photosystem I (PSI). Additionally, it preserved membrane integrity. Moreover, silicon influenced soluble protein levels and increased antioxidant enzyme activities. This was especially true for guaiacol peroxidase, which helped mitigate oxidative stress. Overall, silicon had beneficial effects on the phytoremediation capacity of N. oleander. Therefore, fertilization rich in silicon could represent an effective solution for enhancing the phytoremediation capacity of this species, minimizing one of the major disadvantages of phytoremediation, namely low biomass production influenced by toxicity.