The Effects of Peroxidase and Catalase Components of Pepper Genotypes on Phytophthora capsici Resistance

Abstract

In this study, sixty landrace pepper genotypes were used to test the resistance to Phytophthora capsici. The CM 334 (Criollos de Morelos 334) P. capsici resistant genotype was selected as the control, and two inoculations were applied to all the materials evaluated for peroxidase and catalase enzyme contents. As a result of the first inoculation, genotype CM 334 and native genotypes 3 (P1), 13 (Urfa), 25 (UKST), 38 (UD), 48 (UKDT) and 57 (ANKSB) survived. As a result of the second (last) inoculation, only the CM 334 genotype survived and continued to form shoots. In both inoculations, it was concluded that the enzyme contents of genotypes showing partial or complete resistance were also at elevated levels, especially the peroxidase enzyme content was specifically distinctive. Peroxidase content of all genotypes showing resistance in the first inoculation was high, but catalase content was not very apparent in resistant and sensitive varieties. It has also been determined that P. capsici resistance appeared in the last stages of plant development, rather than in the initial stages of development. As a result of the study, it was determined that materials showing partial resistance even in the first inoculation, could be breeding materials and used in hybridization programs.

Keywords

• Pepper
• Phytophthora capsici
• peroxidase
• catalase