Abstract
1. 1. All tissues of etiolated pea plants and the stems of green pea plants produce peroxides from endogenous substrates. Such peroxides are not accumulated; in the absence of exogenous peroxidizable substrate, they decay, and in the presence of exogenous pyrogallol, they result in the appearance of purpurogallin in the tissue and in the medium. 2. 2. The rate of peroxide formation is increased by visible light, 2,4-dichlorophenol, and manganous ion. Thus, the enhancement of IAA oxidase activity by these three agents is believed due to their effect on peroxide genesis. 3. 3. Peroxide formation in suitably starved tissue may be increased by the addition of typical flavoprotein substrates, such as glycolic acid, xanthine, butanal, and alanine, or by indoleacetic acid itself. Peroxide generation from such substrates is unaffected by Mn ++ or dichlorophenol. These peroxigenic materials must therefore be presumed to operate via other peroxide-generating pathways. 4. 4. Some implications of the metabolic role of peroxides are discussed.
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