Peroxidase, Polyphenoloxidase, Total Phenol and Protein Content in Leaf Tissues of Colocasia esculenta var. antiquorum and Their Relationship to Phytophthora Leaf Blight Disease

Abstract

ABSTRACT Specific activities of peroxidase, polyphenoloxidase, total phenol and total protein content in healthy and diseased leaves of tolerant and susceptible cultivars of Taro (Colocasia esculenta var. antiquorum) to Phytophthora leaf blight disease were studied. Tolerant cultivars of Colocasia had 100% and 81% increase of total phenol and protein, respectively, when compared to susceptible cultivars. The specific activity of peroxidase remained higher while that of polyphenoloxidase remained lower in tolerant cultivars as compared to susceptible cultivars. Adjusting coefficient of determination (R2) at 0.99, the multiple regression equation was derived, which indicated that tolerance was related to all of the components measured.