ArticleBiometals : an international journal on the role of metal ions in biology, biochemistry, and medicine2026
Silicon-mediated alleviation of mercury toxicity requires coordinated regulation of antioxidant defense, metal homeostasis, and nodule function in mung bean.
Article in Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Mercury (Hg) contamination and accumulation in agricultural soil represent a major hazardous environmental concern, posing serious threats to living organisms, including plants. Silicon (Si) has been widely recognized to mitigate heavy metal (loid) toxicity; however, the underlying mechanism of Si-mediated mitigation of Hg-stress in mung bean remains unclear. In this study, we addressed this research gap by thoroughly examining the potential effects of Si supplementation on Hg-stressed mung bean plants, with particular emphasis on investigating the possible effects of Si on plant biomass, nodulation traits, antioxidant defense, and expression of metal-transporter and detoxification genes. Our findings demonstrated that Hg stress significantly impaired plant growth by inducing oxidative stress and reducing biological nitrogen fixation efficiency whereas Si application significantly alleviated the Hg-induced toxicity. Specifically, Si increased shoot dry biomass by +113% (2.13-fold), root dry biomass by +60% (1.60-fold), nodule number by +152% (2.52-fold), and nodule dry weight by +273% (3.73-fold) under Hg stress compared to Hg treated plants only. Furthermore, Si enhanced antioxidant defense system, restricted the uptake and accumulation of Hg in different plant tissues, and regulated the expression of genes related to metal transport and detoxification, contributing to improved nodulation and nitrogen fixation under Hg stress. Overall, our findings demonstrate that Si application mitigates the Hg-induced toxicity in mung bean plants by enhancing antioxidant defense, improving nitrogen fixation, regulation of genes involved in metal transport and detoxification, and limiting Hg accumulation.
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