Pisum sativum (cv. Kudrnac) seeds were obtained from SEMO a.s., Smržice, Czechia. All plants used for the study grew in the experimental field plot at Veletiny, Czechia (49°02'N 17°33'E; 195 m a.s.l.). Sowing was done after the rainfall on June 1, 2022, and plants were grown in a natural environment without any additional treatment. After 35 days, the field was divided into three blocks (mock, SAt1, SAt2), each containing approxi-mately 100 plants. For five weeks, plants were weekly sprayed with 1.5 L water solution supplemented with 0.025% (v/v) Silwet L-77 (mock; K), or 100 µM salicylic acid and Silwet (final concentration as for the mock; SA-a). The third set was treated as the mock for two weeks, followed by four weeks with salicylic acid treatment (SA-b).