Auxin Transport, Gibberellin, and Apical Dominance.

Substitution of indoleacetic acid plus gibberellic acid for Pisum shoot apices restored apical dominance more effectively than indoleacetic acid alone. Studies of translocation, in which carbon-14-labeled indoleacetic acid was used (as determined by paper chromatography and scintillation counting) revealed that gibberellic acid caused more indoleacetic acid to be present and effective far from the site of application.