Nitric oxide fumigation stimulates flavonoid and phenolic accumulation and enhances antioxidant activity of mushroom

► NO fumigation enhanced antioxidant activities of mushroom. ► Phenolic and flavonoid contents increased in the mushroom fumigated with NO. ► NO fumigation stimulated PAL and CHS activities in the mushroom. ► NO enhanced phenolic and flavonoid contents by triggering the biosynthetic pathways.