Auxin-phenol complexes

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Abstract
In vitro studies with polyphenol oxidase and 3 phenols indicate that an enzymatic reaction involving indoleacetic acid can occur with the formation of new colored pigments. Such pigments were chromatographically separated from reactions with catechol, chlorogenic acid, and caffeic acid, respectively. The use of isotopically tagged indoleacetic acid indicated that the pigments may contain the auxin moiety, suggesting that they are addition products of the auxin and quinones. Possible implications of such pigments in plants are discussed.
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