TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Plant: The plant is corn. The plant further comprises a promoter preferentially directing expression of the manganese peroxidase to the seed of the plant. It also comprises a nucleotide sequence preferentially directing expression of the manganese peroxidase to the cell wall of the plant. The manganese peroxidase protein is expressed at levels of at least 0.1%, 3.0%, 10% or 15% total soluble protein.Preferred Method: Expressing manganese peroxidase in viable plants comprises transforming plant cells with a nucleic acid construct comprising a sequence encoding a manganese peroxidase protein. The method further comprises operably linking with the nucleic acid construct a nucleotide sequence preferentially directing expression to the seed of the plant, preferably to the cell wall of the plant.Producing increased levels of manganese peroxidase in plants comprises:(a) transforming a plant tissue with a first nucleotide sequence encoding a manganese peroxidase protein and a second nucleotide sequence operably linked to the first nucleotide sequence and which preferentially directs expression of the first nucleotide sequence to the seed of the plant;(b) culturing a plant from the plant tissue; and(c) growing and harvesting the plant where increased levels of manganese peroxidase is produced.The method further comprises a third nucleotide sequence preferentially directing expression of the first nucleotide sequence to the cell wall of the plant.Producing manganese peroxidase in commercial quantities comprises providing biomass from plants where at least certain plants contain a nucleotide molecule comprised of a heterologous nucleotide sequence coding for the manganese peroxidase, where the nucleotide sequence is operably linked to a promoter to effect expression of the manganese peroxidase by the certain plants to produce commercial quantities of manganese peroxidase. EXAMPLE - Seed from Hi-II maize kernels were transformed with constructs designated pPGN8997, pPGN8998 and pPGN9037. The pPGN8997 construct comprises the PGNpr6 promoter, a manganese peroxidase (MnP) encoding sequence, PinII terminator sequences and the 35S promoter and terminator with moPAT (maize optimized PAT selectable marker). The pPGN8998 construct comprises the same elements as pPGN8997 except that the MnP encoding sequence has the barely alpha amylase export signal sequence. Construct pPGN9037 has the same elements as pPGN8998 except that the PGNpr6 promoter was substituted by the Globulin 1 promoter. Fresh immature zygotic embryos were harvested from Hi-II maize kernels at 2 mm in length. The general methods of Agrobacterium transformation were used. Fresh embryos were treated with 0.5 ml log phase Agrobacterium strains EHA 101. Bacteria were grown overnight in a rich medium with kanamycin and spectinomycin to an optical density of 0.5 at 600 nm, pelleted, then re-inoculated in afresh 10 ml culture. The bacteria were allowed to grow into log phase and were harvested at no denser than OD 600=0.5. The bacteria culture was resuspended in a co-culture medium. For stable transformations, embryos were transferred to a bialaphos selective agent on embryonic callus medium and transferred every two weeks to allow growth of transformed type II callus. Plants were regenerated from the callus.