Basipetally polarised transport of [3H]gibberellin A1 and [14C]gibberellin A3, and acropetal polarity of [14C]indole-3-acetic acid transport, in stelar tissues of Phaseolus coccineus roots

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Abstract
Movement of both [3H]GA1 and [14C]GA3 through root segments from P. coccineus seedlings was basipetally polarised. The basipetal/acropetal ratio of radioactivity from [3H]GA1 in agar receiver blocks was 9.2 for apical, elongating segments, and 4.0 for more basal, non-elongating segments. Polarity of gibberellin transport was restricted to the stele, and absent from cortical tissues. Transport of [14C]IAA through root segments to agar receivers was preferentially acropetal, particularly so in the stele. Despite the existence of basipetal polarity of gibberellin transport in the root, [3H]GA1 injected into cotyledons moved into and acropetally along the seedling root.