Evaluation of Potassium and Nitrogen on Poutresin Content in Wheat against FHB

To assess the effects of potassium and different forms of nitrogen on antioxidant enzyme activity and physiological changes in wheat affected by Fusarium Head Blight (FHB), a factorial experiment was conducted using a completely randomized design with three replications. The treatments included two disease levels (control and infected), three potassium levels (۸۰, ۱۰۰ and ۱۲۰ kg.ha-۱) and three nitrogen application rates (ammonium sulphate, calcium nitrate and a compound treatment consisting of ۷۵% calcium nitrate + ۲۵% ammonium sulphate). The results showed an increase in the levels of superoxide dismutase (SOD) and putrescine under FHB, particularly with the application of potassium and nitrate. The highest content of putrescine (۰.۴۳ µmol/FW) was observed in Fusarium × ammonium × potassium (۸۰ kg). However, protein yield decreased under FHB disease, particularly with ammonium application, whereas potassium and nitrate application led to an increase in protein yield up to (۳۳.۷ mg.plant-۱). Methionine content decreased to (۰.۱۷ mg.g-۱ FW) under disease conditions. Fusarium head blight of wheat increased the activity of antioxidant enzymes. The application of potassium and nitrate had a greater effect on reducing the adverse effects of the disease than potassium alone. This effect could be attributed to their capability of reducing osmolyte levels and modulating the activity of antioxidant enzymes.

کلیدواژه ها:

antioxidant enzyme activity ، FHB ، lysine ، Methionine ، Proline ، Wheat