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The present experiment was designed to assess the effects of seed soaking with 24-epibrassinolide (EBR) on the physiology of  Brassica juncea  L. seedlings grown under imidacloprid (IMI) toxicity. Application of EBR increased the length of seedlings, dry weight, and pigment contents, polyphenols, total phenols, and organic acids under IMI toxicity. The expression of genes coding key enzymes of pigment, phenols, polyphenols, and organic acid biosynthetic pathways was also studied including  CHLASE  (chlorophyllase),  PSY  (phytoene synthase),  CHS  (chalcone synthase) and  PAL  (phenylalanine ammonialyase),  CS  (citrate synthase),  SUCLG1  (succinyl Co-A ligase,),  SDH  (succinate dehydrogenase),  FH  (fumarate hydratase),  MS  (malate synthase). Multiple linear regression (MLR) analysis revealed that IMI application regressed negatively on seedling length, dry weight and total chlorophyll content. However, EBR seed treatment regressed positively on all the parameters studied. Moreover, interaction between IMI and EBR showed positive regression for growth parameters, content of pigments, total polyphenol, total phenol and malate, and expression of  PSY  and  PAL . Negative interactions were noticed for the contents of fumarate, succinate and citrate, and expression of  CHS  and all genes studied related to organic acid metabolism. In conclusion, EBR enhanced the growth and contents of all studied metabolites by regulating the gene expression of  B. juncea  seedlings under IMI stress.

Pre-sowing Seed Treatment with 24-Epibrassinolide Ameliorates Pesticide Stress in Brassica juncea L. through the Modulation of Stress Markers