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<p>Heavy metals, like nickel (Ni) have increased in abundance around urban regions in the last few decades. Both the bulk and nanoparticle forms of Ni negatively impact plant physiological and biochemical processes, thus disrupting plant growth. In the background of challenges to sustained crop production and food security, seed nano-priming was proposed as a promising technique that optimizes germination, enhances seedling vigour as well as overall stress tolerance of plants. The current study was focused on understanding how seed priming with cerium oxide nanoparticles (CeO₂-NP) can protect against stress induced by nickel oxide nanoparticle (NiO-NP) in tomato (<i>Solanum lycopersicum</i> L.). Tomato seeds were primed with 2, 4, and 8&#xa0;mg L⁻¹ CeO₂-NP suspensions for 24&#xa0;h, along with unstressed (water-treated) and NiO-NP-stressed treatment sets. As expected, NiO-NP stress caused significant reductions in germination rate (down by ~ 48%), shoot and root growth (decrease by <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:&gt;50\%)\)</EquationSource> </InlineEquation>, cell viability (decrease by ~ 43%), mitotic index (down by ~ 53%) and genomic stability of exposed seedlings, presumably brought on by an oxidative burst. In contrast, CeO₂-NP priming in all doses effectively reversed these detrimental effects. Of all the doses used, treatment with 4&#xa0;mg L⁻¹ CeO₂-NP showed greatest reduction in oxidative stress, as evidenced by a ~ 31% drop in H₂O₂ accumulation in treated tissues, besides significant increase in antioxidant activity, mitotic index (up by ~ 86%), and improved genomic stability. These findings revealed the potential of CeO₂-NP seed priming in overcoming NiO-NP-induced phytotoxicity and genotoxicity. The study demonstrated CeO₂-NP priming as an effective technique for enhancing plant stress adaptability in Ni-polluted soils.</p>

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Nano-Ceria Priming Ameliorates Heavy Metal Nanoparticle Toxicity in Tomato

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Samir Makhal,
  • Maumita Bandyopadhyay

摘要

Heavy metals, like nickel (Ni) have increased in abundance around urban regions in the last few decades. Both the bulk and nanoparticle forms of Ni negatively impact plant physiological and biochemical processes, thus disrupting plant growth. In the background of challenges to sustained crop production and food security, seed nano-priming was proposed as a promising technique that optimizes germination, enhances seedling vigour as well as overall stress tolerance of plants. The current study was focused on understanding how seed priming with cerium oxide nanoparticles (CeO₂-NP) can protect against stress induced by nickel oxide nanoparticle (NiO-NP) in tomato (Solanum lycopersicum L.). Tomato seeds were primed with 2, 4, and 8 mg L⁻¹ CeO₂-NP suspensions for 24 h, along with unstressed (water-treated) and NiO-NP-stressed treatment sets. As expected, NiO-NP stress caused significant reductions in germination rate (down by ~ 48%), shoot and root growth (decrease by \(\:>50\%)\) , cell viability (decrease by ~ 43%), mitotic index (down by ~ 53%) and genomic stability of exposed seedlings, presumably brought on by an oxidative burst. In contrast, CeO₂-NP priming in all doses effectively reversed these detrimental effects. Of all the doses used, treatment with 4 mg L⁻¹ CeO₂-NP showed greatest reduction in oxidative stress, as evidenced by a ~ 31% drop in H₂O₂ accumulation in treated tissues, besides significant increase in antioxidant activity, mitotic index (up by ~ 86%), and improved genomic stability. These findings revealed the potential of CeO₂-NP seed priming in overcoming NiO-NP-induced phytotoxicity and genotoxicity. The study demonstrated CeO₂-NP priming as an effective technique for enhancing plant stress adaptability in Ni-polluted soils.