Role of Some Phenolic comPoundS in a ReSiStant Gene PyRamided Potato GenotyPe to late BliGht

TAOUTAOU, A., C. SOCACIU, D. PAMFIL, E. BALAZS and C. BOTEZ, 2013. Role of some phenolic compounds in a resistant gene pyramided potato genotype to late blight. Bulg. J. Agric. Sci., 19: 126-132 In this study, we aimed to identify some phenolic compounds that determine resistance in a gene pyramided potato resistant genotype to late blight agent Phytophthora infestans and to compare it reaction with other resistance forms. Three resistant genotypes have been used; two genotypes from Solanum tuberosum: R4 (simple), MR (R2, R3, and R4) and the wild relative Solanum demissum. Inoculation of R4 genotype decreases the synthesis of Gallic acid and increase the amount of protocatecuic acid. In the case of S. demissum, an increase of the synthesis of protocatecuic acid, caffeic acid and ferulic acid. In the case of MR, inoculation induced a decrease of the synthesis of chlorogenic acid, caffeic acid, o-coumaric acid, quercetin and Kaempherol.