Is indolyl‐3‐acetic acid involved in the wave‐like pattern of auxin efflux from Pinus sylvestris stem segments?

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Abstract
The coleoptile curvature bioassay of agar diffusates from successive cambial‐region sections of Pinus silvestris L. stem tissue reveals the existence of a wave‐like pattern, possibly of auxin translocation. Spectrofluorometric determinations of indolyl‐3‐acetic acid (IAA) in these diffusates gave only a poor correlation. Probably another phytohormone, also an auxin, plays a more important role in the pattern.The amplification in the amplitude of the pattern, brought about by apically applied IAA, cannot be induced by the synthetic auxin, 2,4‐dichlorophenoxyacetic acid.