Abstract
Selected compounds from several groups of chemicals known to affect the root geotropic response in plants have been assessed for their effects on both stem and root geotropism in cress seedlings in order to compare their relative activities. It is suggested that a class of compound which affects geotropism can be distinguished, and that the molecular requirements for its activity can be tentatively defined. It is suggested that an ortho carboxylic acid function attached to an aromatic ring, which is separated by a conjugated system of atoms from a second aromatic ring, is required for high activity. Substituents on the second aromatic ring increase activity if they assist in the achievement of a minimum molecular size.
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