The plants have developed several defense mechanisms to counteract pathogens. Among others, it includes activation of antioxidant enzymes likeβ-glucosidase and guaiacol peroxidase (GPX). These proteins participate in the oxidation of phenolic compounds, contributing to their increased fungitoxicity. The study aimed to analyze changes in the activity ofβ-glucosidase and GPX in four genotypes of winter oilseed rape (Mendel, Monolit, Polka, line L1425) inoculated with seven isolates:Alternaria brassicicola,Alternaria brassicae,Alternaria alternata(3 strains),Ulocladium chartarum(syn.A. chartarum), andCladosporium cladosporioides. We noted that the varieties of oilseed rape, tested fungal species, and time of the plant material collection had significant (P < 0.001) effect on the activity ofβ-glucosidase and GPX per protein and fresh matter content comparing to the control group.A. brassicicolacaused the highest mean increase inβ-glucosidase and GPX activity in all examined genotypes, while other pathogens had a lower impact. Significantly lowerβ-glucosidase activity inoculated by various pathogens was noted between the L 1425 line and other varieties. GPX activity was in the opposite, the lowest activity was recorded in the Mendel variety, and the highest in the L 1425 line.
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Pieczul et al. (2020) studied this question.
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