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Peroxidase and hydrogen peroxide both play important roles in the final stages of the lignification pathway.\udPeroxidase, in the presence of H2O2 catalyses the oxidation of monolignols to give lignin. In order to examine this process\udwe looked at lignification in transgenic tobacco plants expressing a barley peroxidase gene, HvPrx8, either alone or in\udcombination with a wheat germin gene, g.f 2.8, which encodes oxalate oxidase, thereby providing a source of H2O2. Elevated\udactivity of the antioxidant ascorbate peroxidase was found in plants expressing oxalate peroxidase and was greatly\udincreased by co-expression with the barley peroxidase, although the latter had no effect when expressed alone. An increase\udwas observed in the oxidation of the lignin monomer, syringaldazine in cell lines over-expressing barley peroxidase,\udwhile a decrease was observed in double transformants. Plants over-expressing barley peroxidase have elevated levels\udof lignin deposition compared to that of wild type tobacco plants. Over-expression of the individual enzymes was also\udshown to enhance heat-induced programmed cell death (PCD) in cell suspension cultures, an effect which was greatly reduced\udin the double-expressing lines

Altered Activity of Peroxidase and Oxalate Oxidase Influences Lignification in Transgenic Tobacco