Życica trwała pomimo swoich zalet, takich jak wysoka odporność na udeptywanie czy też silne krzewienie, jest rośliną podatną na stresy abiotyczne i biotyczne. Celem przeprowadzonych prac było sprawdzenie wpływu Rhizophagus irregularis na indukowanie mechanizmów zwiększających odporność życicy trwałej porażonej przez Drechslera teres. Trawę zasiedloną R. irregularis oraz niezasiedloną poddano inokulacji badanym patogenem. Przeprowadzono ocenę stopnia porażenia roślin. Dodatkowo materiał roślinny został poddany analizie na obecność związków fenolowych oraz na zawartość i aktywność białek enzymatycznych. Objawy porażenia na roślinach zasiedlonych grzybem endomykoryzowym były mniejsze aniżeli u tych bez badanego symbionta. Zawartość związków fenolowych i białka ogólnego w roślinach nie różniła się znacząco. Wystąpiły natomiast różnice w zawartości chitynaz oraz β-1,3-glukanaz. Rezultaty uzyskane z prze­prowadzonego eksperymentu potwierdzają korzystny wpływ R. irregularis na rozwój życicy trwałej i jej wzrost odporności na porażenie przez D. teres.

Perennial ryegrass, despite its advantages such as high resistance to trampling or strong tillering, is a plant susceptible to abiotic and biotic stresses. The aim of the conducted work was to check the effect of Rhizophagus irregularis on increasing the perennial ryegrass resistance to infection by Drechslera teres. Grass infested with R. irregularis and uninfested were inoculated with the tested pathogen. Measurement of plant infection assessment was carried out. Additionally, the plant material was analyzed for the presence of phenolic compounds and the content and activity of enzymatic proteins. Symptoms of infection on plants infested with the endomycorrhizal fun­gus were smaller than those without the tested symbiont. The content of phenolic compounds and total protein in plants did not differ significantly. However, there were differences in the content of chitinases and β-1,3-glucanases. The results obtained from the conducted experiment confirm the beneficial effect of R. irregularis on perennial ryegrass in the fight against D. teres.

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