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Hydrogen Peroxide-mediated Oxidation of Indole-3-acetic Acid by Tomato Peroxidase and Molecular Oxygen ¹

^a Department of Plant Sciences, College of Agriculture and Forestry, West Virginia University, Morgantown, West Virginia 26506

The oxidation of indole-3-acetic acid by anionic tomato peroxidase was found to be negligible unless reaction mixtures were supplemented with H₂O₂. The addition of H₂O₂ to reaction mixtures initiated a period of rapid indole-3-acetic acid oxidation and O₂ uptake; this phase ended and O₂ uptake fell to a low level when the H₂O₂ was exhausted. The stoichiometry of the reaction, which is highly dependent on enzyme concentration and pH, suggests that H₂O₂ initiates a sequence of reactions in which indole-3-acetic acid is oxidized.

³ To whom reprint requests should be addressed.

¹ Published with the approval of the Director of the West Virginia Agricultural and Forestry Experiment Station as Scientific Paper 1554.

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