| Abstrakt: |
The study was conducted to consider the role of nitrate reductase (NR)-synthesized nitric oxide (NO) in the methyl jasmonate (MJ)-induced tolerance of arsenic (As) stress in rice plants. Before starting As treatment, rice plants were sprayed with 0.5 mM MJ for 3 days. Thereafter, rice plants were hydroponically treated with 50 μM As for 2 weeks. Arsenic treatment diminished growth and photosynthetic pigments and increased hydrogen peroxide (H2O2), methylglyoxal (MG) and malondialdehyde (MDA), electrolyte leakage (EL), nitrate reductase (NR), nitric oxide (NO) level, antioxidant enzymes, the glyoxalase cycle, and the leaf and root contents of glutathione (GSH) and phytochelatins (PCs) in rice. MJ lessened the root and leaf concentrations of As and the levels of H2O2, MG, MDA, and EL, enhanced plant growth and photosynthetic pigments, and led to further improvements in the activity of antioxidant enzymes, the glyoxalase cycle, NR activity, and the endogenous level of NO in rice plants under As stress. MJ enhanced the levels of GSH and PCs in the roots and leaves of As-stressed rice by regulating the expression of GSH1, PCS, and ABCC1 genes. However, the application of sodium nitroprusside as a NO donor reversed the inhibitory effects of sodium tungstate on MJ-induced As tolerance, suggesting that NR-synthesized NO is required for MJ-mediated As tolerance of rice plants. [ABSTRACT FROM AUTHOR] |
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