Abstract
Summary Phenolic promotors and inhibitors of IAA-oxidase activity stimulate the induction of adventitious roots in Tradescantia . The former are physiologically more effective with the exception of homovanillic acid, which is the strongest inductor although it inhibits IAA-oxidase activity. The growth of the adventitious roots is, on the other hand generally inhibited by all phenolic compounds. Some of these applied phenolic acids are native substances of the cuttings. Correlative to root promotion and the effect on IAA-oxidase activity is the increase of oxygen uptake by the nodes of Tradescantia after phenolic treatment. The relationship of this effect and of root induction to the uncoupling of oxidative phosphorylation is discussed.
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