The role of peroxidase and polyphenol oxidase isozymes in wheat resistanceto Alternaria triticina

Polyphenol oxidase activity was higher in resistant wheat cultivar ACC-8226 than in susceptible cultivar MP-845 in control sets and after inoculation of Alternaria triticina. However, similar polyphenol oxidase isozyme patter n was found in control and inoculated sets of both the cultivars, but the b and intensity was higher after inoculation. Three and four peroxidase isozy mes were found in ACC-8226 and MP-845, respectively. An extra peroxidase is ozyme band was observed in both the cultivars after inoculation. The result s suggest an active role of peroxidase and polyphenol oxidase in defence me chanism of wheat plants.