Abstract
The auxin production by the tip of the Avena coleoptile seems too high for a complete geotropic response (a curvature of 90°) under the present experimental conditions (weak red light). It is sufficient for a maximum rate of geotropic curvature, but it is too low for a maximum rate of elongation. The entrance of indoleacetic acid through the cuticle is 2500–3000 times as difficult as that via the cut surface of a decapitated Avena coleoptile.
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