Resistance And Mechanisms In Potato Against Fungal Diseases Induced By Chemicals

In our research 32 chemicals were used to induce resistance for potato (Solarium tuberosum L.) tubers against early blight, respectively. 13 chemicals, including oxalic acid, potassium chloride (KC1), ferrous sulfate (FeSO₄), Phenol, 3,5-dinitro salicylic acid, 5-sulfosalicylic acid, sodium molybdate (Na₂MoO₄), sodium metasilicate (Na₂SiO₃), sodium dihydrogen (NaH₂PO₄) , benzoic acid, para amino benzoic acid, indole-3-acetic acid, manganous sulfate (MnSO₄) could induce sub-systemic resistance of potato tubers against Alternaria solani, while they couldn't inhibit the growth of A. solani in vitro. Effects of compounds mixed from Phenol and 5-sulfosalicylic acid on the induction resistance for potato tubers against early blight was also investigated. Results showed that these compounds could not induce sub-systemic resistance of potato tubers against A solani.We also used above-mentioned 13 chemicals to induce resistance for potato tubers against late blight. Results showed that most of these chemicals could induce sub-systemic resistance of potato tubers against Phytophthora infestans. KC1, MnSO₄, Na₂SiO₃ could not induce resistance of potato tubers against P. infestans. It seemed that was were related to the different pathogens.This research investigated the mechanism of inducing sub-systemic acquired resistance for potato tubers with 13 chemicals. The activity of peroxidase (POD), phenylalanine ammonia lyase (PAL) and polyphenolo oxidase (PPO) which were related to sub-systemic resistance for the induced tubers were enhanced by 12 chemicasls. It seemed that the sub-systemic resistance induced for potato tubers to A. solani and P. infestans by some chemicals via activating POD, PAL and PPO.