EFFECTS OF CADMIUM ON THE HOST-PATHOGEN SYSTEM .5. EFFECT OF EXOGENOUS DICYCLOHEXYLAMINE ON POTATO-TUBERS (SOLANUM-TUBEROSUM L), CADMIUM AND PHYTOPHTHORA-INFESTANS RELATIONS

Treatment of potato (Solanum tuberosum L.) tuber slices with dicyclohe xylamine (DCHA) led to a reduction in some of endogenous polyamine (PA ) titers and peroxidase (PO) activity in and to a decrease in the elec trolyte leakage (EL) from the tissues. Simultaneously, these changes w ere associated with the alteration of interactions between this tissue and cadmium, and Phytophthora infestans. Two cultivars, Bintje and Bz ura, respectively susceptible and resistant to cadmium and pathogen, w ere examined. Pretreatment of tuber slices with DCHA, before inoculati on, resulted in limitation of infection in the susceptible tissues. Th e possible involvement of PA in the transduction of the cadmium and pa thogen signals is discussed.