Indoleacetic Acid Oxidizing Enzyme & Inhibitors from Light-Grown Cotton

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Abstract
An IAA oxidase and a lag-inducing inhibitor are active in extracts of tissues of Gossypium hirsutum and other Gossypium species from each of the genome groups of the genus. The inhibitor-induced lag is reduced significantly or apparently eliminated by light (30-80 ft.-c.) and riboflavin, neither of which is active alone. Gossypol and kaempferol both inhibit the enzyme in a manner similar to the natural inhibitor. Inhibition by both is reversed by light and riboflavin. There was no stimulation of IAA oxidase activity by hydrogen peroxide.