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• W3088221813 abstract "Heavy metal pollution seriously impairs crop production and poses serious concerns for human health. Exogenous application of biomolecules has been efficiently tested for enhancing plant resistance to metal toxicity. Current study evaluates the possible effect of 5-aminolevulinic acid (ALA) in Brassica juncea L. seedlings subjected to lead (Pb) stress. Our results showed that shoot length, root length and chlorophyll contents were significantly recovered in Pb stressed seedlings after ALA application, accompanied by reduction in the Pb accumulation. Significant reduction in the contents of reactive oxygen species (ROS) like superoxide anion, hydrogen peroxide and malondialdehyde were also observed in ALA treated seedlings under Pb stress. Furthermore, we also noticed enhancement in the activities of antioxidative enzymes like superoxide dismutase (SOD), catalase (CAT), guaiacol peroxidase (POD), glutathione reductase (GR), glutathione-S-transferase (GST) and dehydroascorbate reductase (DHAR). We further noticed that ALA upregulated the expression of SOD (7.30 folds), POD (6.11 folds), CAT (3.52 folds), DHAR (6.42 folds), GR (6.04 folds), and GST (5.58 folds) under the Pb stress. However, RBOH1 (gene involved in ROS generation) and CHLASE (chlorophyllase) expressions were reduced in ALA treated seedlings grown under Pb stress (RBOH1 expression decreased to 3.44 from 6.50 fold and CHLASE expression decreased to 2.97 from 5.58 fold). Phenolic contents were increased in the presence of ALA and expression of genes like CHS (chalcone synthase; 7.50 fold) and PAL (phenylalanine ammonia lyase; 4.77 fold) was also stimulated by ALA under Pb stress. Furthermore, contents of the Krebs cycle metabolites (fumarate, succinate, malate and citrate) were also enhanced accompanied by upregulated expression of genes like CS (citrate Synthase; 8.13 fold), SUCLG1 (succinyl CoA ligase 1; 7.40 fold), SDH (succinate dehydrogenase; 5.10 fold) and FH (fumarate hydratase; 5.65 fold). In conclusion, current investigation revealed that ALA attenuated Pb toxicity by modulating the transcription patterns of key enzymes involved in plant defense system." @default.
• W3088221813 created "2020-10-01" @default.
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• W3088221813 date "2020-11-01" @default.
• W3088221813 modified "2023-10-09" @default.
• W3088221813 title "5-aminolevulinic acid regulates Krebs cycle, antioxidative system and gene expression in Brassica juncea L. to confer tolerance against lead toxicity" @default.
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• W3088221813 doi "https://doi.org/10.1016/j.jbiotec.2020.09.004" @default.
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