Two tomato (Lycopersicon esculentum) cultivars were studied due to their reaction with cerium perhydroxide, verifying H2O2 produced in tomato plants boyh resistant and susceptible to Stemphylium solani. There was an accumulation of cerium perhydroxide on the wall of mesophyll cells in contact with the pathogen hyphae. Different reactions were not found int the two tomato cultivars concerning H2O2 accumulation. Since cerium perhydroxide was detected on negative control as well, it is suggested that H2O2 may possibly not participate in the resistance of c.v. 'Motelle' to S. Solani, in terms of cell wall buttressing.
resistance; cell wall; Lycopersicon esculentum; H2O2
