The effect of potassium phosphite as a defense stimulant in rice seedlings against Pyricularia oryzae and antioxidant enzymes activity

Articles in Press

Document Type : Research Paper

Authors

1 Department of Plant Protection, Faculty of crop Sciences, Sari Agricultural Sciences and Natural Resources University. Sari, Iran

2 Department of Plant Protection, Faculty of crop Sciences, Sari Agricultural Sciences and Natural Resources University. Sari, Iran.

3 Department of Plant Protection Research, Rice Research Institute of Iran, Deputy of Mazandaran, Education and Extension Organization, Amol, Iran

4 Biological Control Research Department, National Plant Pathology Research Institute, Agricultural Research, Education and Extension Organization, Tehran, Iran.

10.22059/ijpps.2025.391543.1007080

Abstract

Rice blast caused by Pyricularia oryzae is an important rice disease that reduces crop yield annually. One of the methods of controlling the disease is the use of fungicides, which poses risks to humans and the environment. Therefore, the use of environmentally friendly inducers of resistance such as potassium phosphite can reduce the use of chemical pesticides and increase plant resistance through induced resistance. In present study, the effect of potassium phosphite as a defense stimulant on reducing the rice blast disease and the activation of catalase, peroxidase and superoxide dismutase enzymes was considered by factorial in a completely randomized design. Samples were selected from rice seedlings treated with potassium phosphite and mock at 0, 48, 96, and 144 hours after inoculation. Results showed, potassium phosphite significantly reduced disease severity by 48%. As well, the activity of enzymes in treated plants was higher than in control plants at all time courses after inoculation. The highest activity of peroxidase enzymes (protein1-U 62.277 mg) and superoxide dismutase (protein1-U 17.246 mg) was observed at 144 hours after inoculation, with a 1.38- and 1.30-fold increase compared to the control, respectively. The findings indicate that rice pretreatment by potassium phosphite can increase the resistance of rice seedlings by induction of the activity of defense-related enzymes and it seems to be effective for the disease management.

Keywords

Iranian Journal of Plant Protection Science

Articles in Press, Accepted Manuscript
Available Online from 15 December 2025

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History

  • Receive Date: 11 June 2025
  • Revise Date: 18 August 2025
  • Accept Date: 13 December 2025

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