The activities of one-electron oxidation, hydroxyl radical generation, and phenol oxidase during the incubation of cultures of four white-rot fungi containing either glucose or wood were periodically measured. Further, their degradation activities against wood were examined during the course of cultivation. The generation of hydroxyl radical was correlated to the activity of wood degradation and it was not dependent upon the activity of oxidants such as phenol oxidase. The generation of hydroxyl radical was mostly due to the extracellular low molecular weight substances that catalyzed redox reaction between electron donors and O2 to produce H2O2 via O2 and to reduce H2O2 to HO·.The substances reduced Fe(III) to Fe(II) and strongly absorbed Fe(II).

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