Antioxidative Reactions and Lipid Peroxidation in Roots of Susceptible and Resistant Pepper Genotypes infected with Phytophthora capsici Leon.

28181

Three pepper genotypes (resistant PM-702, susceptible Kahramanmaraş- Hot (KM-Hot) and Demre-8) with, different resistance to Phytophthora capsici were inoculated with different concentration of zoospores (10^2, 10^3 and 10^4 zoospore/ml) to analyze of peroxidase (EC 1.11.1.7) activity, phenolic compounds and MDA (Malondialdehyde) which is a product of lipid peroxidation. Samples were collected from the roots of three pepper genotypes on the 6th days after infection. Important differences were observed in peroxidase activity with respect to zoospore concentration and type of pepper genotypes. Activity of peroxidase was increased in inoculated roots of resistant PM-702 genotype and the highest peroxidase activity in non-infected (control) roots was recorded in resistant genotype PM-702. Although, phenolic compounds were increased in PM-702 and KM-Hot in relation to inoculum concentrations. It was decreased in Demre-8 genotype. When all three pepper genotypes were compared in terms of MDA content on roots. Amount of MDA in the roots of DEM-8 genotype was significantly higher than those of PM-702 and KM-Hot genotypes (P 0.01).

382

Antioxidant , pepper , phenolic , MDA , peroxidase , P.capsici

Erciyes University Journal Of The Institute Of Science an‎d Technology

388

Erciyes University Journal Of The Institute Of Science an‎d Technology