Removal of H(2)O(2), oxidation of toxic reductants, biosynthesis and degradation of lignin, suberization, auxin catabolism, response to environmental stresses such as wounding, pathogen attack and oxidative stress. These functions might be dependent on each isozyme/isoform in each plant tissue. May contribute to protection against cold-induced oxidative stress. 2 a phenolic donor + H2O2 = 2 a phenolic radical donor + 2 H2O Binds 2 calcium ions per subunit. Binds 1 heme b (iron(II)-protoporphyrin IX) group per subunit. Highly expressed in suspension cultured cells and calli. Weak expression also found in the stems of intact plants. No expression in leaf, tuberous root and non-tuberous root. Highly expressed 0.5 days after subculture (DAS). No expression was detected at 5 DAS and then expression was highly induced between 11-20 DAS. By wounding and cold stress. Weakly induced by acclimation and strongly induced by chilling treatment. Belongs to the peroxidase family. Classical plant (class III) peroxidase subfamily. Lacks one of the disulfide bridges highly conserved in the class III peroxidase family.