Alterations in HO-1 expression, heme oxygenase activity and endogenous NO homeostasis modulate antioxidant responses of Brassica nigra against nano silver toxicity

Nitric oxide mitigates salt-induced oxidative stress in Brassica juncea seedlings by regulating ROS metabolism and antioxidant defense system

“…Combined application of SNP with NaCl improved the plant growth by increasing the fresh weight, dry weight, root length and shoot length. The study is consistent with the finding of the earlier reports on different crops such as Brassica nigra (Amooaghaie et al 2018), Eruca sativa (Mahawar et al 2018a, b) and Solanum lycopersicun (Ahmad et al 2018). The study conducted on the B. juncea and C. arietinum by Ahmad et al (2016) andFatma et al (2016) reveals that the application of SNP promoted the plant growth under a saline environment which might be due to the fact that NO acts as a relaxant for plant cell wall, protect the lipid membrane, enhanced the fluidity of membrane and also triggers the enlargement of cell and plant growth.…”

“…Nitric oxide is a bioactive signalling molecule which facilitates the improvement in plant growth and development under different environmental conditions (Verma et al 2013;Fancy et al 2017;Amooaghaie et al 2018). In the present investigation, NaCl stress significantly declined the growth and yield of B. juncea (Table 1), which is in agreement with previous reports on different plant species such as Oryza sativa (Mostofa et al 2015) and Cicer arietinum (Ahmad et al 2016).…”

Role of Engineered Carbon Nanoparticles (CNPs) in Promoting Growth and Metabolism of Vigna radiata (L.) Wilczek: Insights into the Biochemical and Physiological Responses

“…In our study, the activity of all antioxidants, including SOD, CAT, POD, APX and HO, increased under CNPs treatment, which shows the clear response of V. radiata seedlings towards carbon nanoparticles, although the decrease in enzyme activity at 200 µM might be due to the phytotoxic effect of CNPs on protein formation and other physiological parameters at high concentrations that inhibit enzyme proteins [ 18 ]. Similar trends in antioxidant activity were recorded in Brassica juncea and Brassica nigra treated with ZnO [ 18 ] and Ag nanoparticles [ 48 ]. Moreover, we observed dissimilar antioxidant activity in our study, such as increased activity of peroxidases (GOPX and APX) in roots and CAT in leaves after exposure of CNPs treatment for a period of 96 h. The difference in antioxidant activity in crop tissues demonstrates that these antioxidants were working in parallel to exterminate hydrogen peroxide.…”

Insights into nanoparticle-induced changes in plant photosynthesis

“…Ag NPs and AgNO3 NPs are two main types of Ag NPs, both of which were shown to significantly reduce the photosynthetic performance, total chlorophyll, carotenoids, and total protein content and also increased the oxidative stress in cucumber (Cucumis sativus); the adverse effects were greater in plants treated with AgNO3 NPs (Tripathi et al 2017a). Likewise, exposure to 400 mg L -1 of Ag NPs or AgNO3 NPs led to significant reductions in the Chl contents and growth parameters in Brassica nigra, however, Ag NPs were demonstrated to be more toxic than AgNO3 NPs as revealed by monitoring the Ag accumulation as well as the lipid peroxidation and the H2O2 content of root and shoot tissues (Amooaghaie et al 2018).…”