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Synergistic effects of exogenous glutathione and calcium on ascorbate–glutathione cycle and glutathione-associated enzymes upregulation under lead stress in Brassica napus L

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Abstract

Heavy metals (HMs) such as lead (Pb) pose a significant threat to global food security due to their adverse effect on the health of crop plants. Calcium (Ca) and Glutathione (GSH) are signaling molecules to scavenge free radicals in HM-stressed plants. In this study, GSH and Ca’s role is examined in supporting canola seedlings against Pb toxicity. In a pot experiment, the administration of Glutathione (GSH, 0 and 100 µM) and/or calcium (CaCl2, 0 and 500 µM) in canola seedlings was examined under lead stress (0 and 100 µM of Pb(NO3)2. Compared with the control samples, Pb treatment increased MDA and H2O2 values by 61 and 53%, respectively, indicative of oxidative burst. However, using a combination of GSH and Ca lowered oxidative stress in Pb-stressed plants by an approximately twofold reduction in MDA and H2O2 content. Total PC content increased by 78% in Pb-stressed plants, suggesting that these chelating peptides diminish the damaging effects of Pb. Interestingly, further boosts in total PC levels were recorded in Pb-stressed plants treated with GSH and Ca concurrently. The addition of exogenous GSH and Ca to Pb-stressed canola plants limited Pb uptake and translocation and improved ascorbate–glutathione cycle performance. Moreover, compared to their separate usage, the co-treatment of exogenous GSH and Ca strengthened the GSH pool by increasing the activities of enzymes involved in GSH metabolism. The findings demonstrate that exogenous GSH and Ca modulate GSH synthesis, metabolism, and redox homeostasis synergistically to enhance resistance to oxidative stress generated by Pb.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Shima Hanife: Conceptualization, investigation and writing of the manuscript. Shahram Namdjoyan: Investigation, supervision, analysis, and interpretation of data for the work. Hossein Kermanian: investigation, writing, reviewing and editing of the manuscript.

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Correspondence to Shahram Namdjoyan.

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Hanife, S., Namdjoyan, S. & Kermanian, H. Synergistic effects of exogenous glutathione and calcium on ascorbate–glutathione cycle and glutathione-associated enzymes upregulation under lead stress in Brassica napus L. Environ Sci Pollut Res 30, 108979–108991 (2023). https://doi.org/10.1007/s11356-023-30000-1

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