... (EC 1. 15 .1. 1, SOD), ascorbate peroxidase (EC 1. 11. 1 .11 , APX) and catalase (EC 1. 11. 1.6, CAT). SOD catalyzes the dismutation of two molecules of O2•- in O2 and H2O2. On the other hand, ... Zilinskas, 19 92), Arabidopsis (Jespersen et al., 19 97), rice (Morita et al., 19 99), spinach (Webb & Allen, 19 95) , tobacco (Orvar & Ellis, 19 95) and potato (Kawakami et al., 2002; Park et ... cells: cytosolic (Ishikawa et al., 19 95), peroxisomal (Ishikawa et al., 19 98), two chloroplasmatic APX (in the stroma and thylakoid) (Ishikawa et al., 19 96) and mitochondrial (De Leonardis et...