Aim. The aim of research was to analyze the activation of Triticum aestivum L. non-specific resistance by the effect of ferulic acid and NO on H2O2 content against fungal pathogen from environment in field trials. Methods. Content of endogenous H2O2 was measured in elicitor treated and infected wheat plants (cv. Oberig myronivskij and Svitanok myronivskij) during different ontogenesis phases. The extent of disease development, morphometric parameters and yield structure were analyzed. Results. The data obtained suggest that different levels of endogenous hydrogen peroxide were induced in wheat leaves by treatment. The growth and yield were stimulated. The infection damage decreased. Conclusions. The role of endogenous hydrogen peroxide is crucial for wheat defense during all vegetation period. The elicitor and donor NO induced effective defense responses and resistance in winter wheat against Erysiphe graminis. Keywords: Triticum aestivum L., ferulic acid, NO, induced resistance, powdery mildew.
Aim. The aim of the research was to investigate the induction of the Triticum aestivum L. non-specific tolerance by ferulic acid as a biotic elicitor and donor of nitric oxide as a signal molecule to hypoxia and wounding stress. Methods. Winter wheat plants cv. Kesariia Polis`ka were grown and had treated by ferulic acid and sodium nitroprusside (SNP) solutions then wounding or flooding stress started. The hydrogen peroxide content was measured in leaves during the experimental period. Results. It is shown that an influence of the nitric oxide donor balanced the hydrogenous peroxide level in wounded leaves close to control. After two days of flooding stress plants treated by ferulic acid decreased hydrogen peroxide level on 15 % against threefold decreasing in non-treated stressed plants. Donor NO treatment also paid contribution to hydrogen peroxide equilibrium during the first hour under hypoxia conditions caused by flooding stress and decreased hydrogen peroxide content till the third day of stress. Conclusions. Ferulic acid and nitric oxide donor are perspective components for complex defense against hypoxia and wounding in wheat plants.
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