Nitric oxide in co-ordination with nitrogen reverses cadmium-inhibited photosynthetic activity by interacting with ethylene synthesis, strengthening the antioxidant system, and nitrogen and sulfur assimilation in mustard (Brassica juncea L.)

•Nitric oxide alleviates Cd toxicity prominently in the presence of N.•Nitric oxide influences ethylene synthesis.•Nitric oxide maintains ethylene production and N and S assimilation.•Nitric oxide stabilizes the antioxidant system.•Nitric oxide and N effects are mediated by ethylene.