Abstract
SummaryProcesses of oxidation, mediated by phenolase or by aeration, were found to be effective pathways in the production of root-differentiating substances from some glycosidic and polycylic phenols. Moderately effective precursors were phloridzin, arbutin, quercitrin, and chlorogenic acid; phloretin and quercetin were highly effective.The growth-regulating action of phloridzin and of its sub-products, phloretin, phloretic, and p-hydroxybenzoic acids was reviewed, and considered with new information on the root-promoting properties of oxidized phloridzin and the oxidized sub-products. It is suggested that the principal function of phloridzin in Malus is to provide the tree with a large and varied supply of growth-regulating substances.
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