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. AH2 + H2O2 = A + 2 H2O Binds 1 heme b (iron(II)-protoporphyrin IX) group per subunit. Binds 2 calcium ions per subunit. Induced by infection with the bacterial pathogen Xanthomonas oryzae pv oryzae, and wounding in mature leaves. Belongs to the peroxidase family. Classical plant (class III) peroxidase subfamily.