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IEF pattern of cPOD (A), total peroxidase (B), and NADH-POD oxidase activity (C) in root cell wall isolated from plants of different ages as indicated. Whole roots were used for cell wall isolation. Peroxidase activity was measured spectrophotometrically with pyrogallol as a substrate. Measurement of NADH-POD oxidase activity was done according to Fecht-Christoffers et al. (2006). Values with different letters are significantly different at P < 0.05, according to Holm–Sidak test.
