Callose and/or phenolic compounds accumulation, which leads to the plant cell wall reinforcement in the places of the host plant and pathogen contact, is one of the first plants reactions on to the pathogen. The local protective reaction causes systemic protective mechanisms that cover the entire plant organism. The purpose of the work was determination of callose and phenolic compounds content in winter wheat seedlings of Myronivska 808 and Renan varieties as constitutional and induced by the eyespot causal agent in the range of their titres active concentrations and comparison of these substances accumulation in time. Callose determination was carried according to the modified Kauss et al. method. Phenoliccompounds quantificationassaywas basedon Folin-Ciocalteu method. The content of constitutional and pathogen-induced callose and phenolic compounds in the winter wheat seedlings of Myronivska 808 and Renan varieties was determined. The higher content of constitutional callose and phenolic compounds at the initial stages of vegetation was established in the wheat seedlings of relatively resistant variety Renan than in the seedlings of the susceptible variety Myronivska 808, which is related with genetically determined resistance of this variety to the eyespot causal agent. More intensive pathogen-induced accumulation of callose was observed in wheat seedlings of Myronivska 808 variety, but this did not affect the overall effectiveness of protection against pathogen. The highest pathogen-induced callose accumulation in wheat seedlings of a relatively resistant variety Renan was under inoculum concentration 104 CFU/ml and in seedlings of the susceptible variety Myronivska 808 – 102 CFU/ml. It has been shown that the higher content of constitutional callose and phenolic compounds and their intensive accumulation under infection in the wheat seedlings of Renan variety, is a determinative factor of the resistance to the eyespot causal agent.
Effect of Phosphate-Mobilized Microbial Preparations on Lectin Activity and Photosyntetic Apparatus of Winter Wheat Seedlings under Eyespot Causal Agent Infection
