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KOLEVA-VALKOVA LYUBKA, PIPERKOVA NESHKA, PETROV VESELIN, VASSILEV ANDON. 2017. Biochemical Responses of Peach Leaves Infected with Taphrina Deformans Berk/Tul. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 65(3): 871–878. The phytopathogenic fungus Taphrina deformans causing the so called “leaf curl disease” in peach trees leads to severe yield losses due to the development of leaf hypertrophy and subsequent necrosis and scission. Because of its economic importance, the molecular mechanisms underlying the onset and progression of the disease are of considerable interest to the agricultural science. In this study various biochemical parameters, including the activities of the antioxidant enzymes guaiacol peroxidase, syringaldazine peroxidase and catalase, total polyphenols and anthocyanin content, concentration of free proline, antiradical activity and quantity of plastid pigments, were characterized. All these were measured in both leaves with clear symptoms and distally situated leaves from the same plant that show no signs of the infection. The results demonstrate that the pathogen induces considerable biochemical changes concerning enzymatic and non-enzymatic elements of the plant defense and antioxidant systems. Moreover, it seems that the fungus provokes a systemic response detectable even in the tissues without observable symptoms.