Abstract
THE movement of 3-indolylacetic acid (IAA) may play an important part in the regulation of growth, development and geotropic curvature in roots, as well as in shoots. It is therefore important to establish the characteristics of the transport system for molecules of this general configuration in plant tissues. The movement of IAA in shoot tissues is strictly polarized in a basipetal direction1,2, but the characteristics of its movement in root tissues are less well established. It has been reported that in some roots more IAA moved basipetally than acropetally3, but that in others more IAA moved acropetally than basipetally4–6. Other investigators have reported transport of IAA in both directions7, or no evidence for an active transport system at all8. In the light of the conflicting evidence we have re-examined the movement of radioactive IAA in roots of a number of different genera.
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References
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Wilkins, M. B., and Scott, T. K., Planta (Berl.) (in the press).
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WILKINS, M., SCOTT, T. Auxin Transport in Roots. Nature 219, 1388–1389 (1968). https://doi.org/10.1038/2191388a0
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DOI: https://doi.org/10.1038/2191388a0
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