Short-term Effects of Some Chemicals on Cambial Activity

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Abstract
Aqueous solutions of indol-3yl-acetic acid (IAA), 1-naphthyl-acetic acid (NAA), 2,4-dichlorophenoxyacetic acid (2,4-D), gibberellic acid (GA), 6-furfuryl-aminopurine (FAP), myo-inositol, and sucrose were applied singly and in mixtures to the apical ends of disbudded stem segments of willow. After 4 weeks all substances had had some effect on differentiation of xylem from cambial derivatives. The production of potential xylem cells, as well as their differentiation were most markedly enhanced when IAA, GA, and FAP were applied together, although the response was further augmented by addition of inositol or sucrose. The action of the substances when applied as mixtures was often synergistic. This means that it is difficult to assess the role of different chemicals in xylem production by extrapolation from experiments involving the application of single substances.

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