Auxin-Promoted Transport of Metabolites in Stems ofPhaseolus vulgarisL.

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Abstract
Phloem transport in stems of Phaseolus vulgaris was found to be sensitive to treatment with the auxin transport inhibitor, 2,3,5-triidobenzoic acid (TIBA). The response was dependent on the concentration of TIBA applied. A concentration of TIBA (0·5% in lanolin) which did not interfere with normal phloem transport proved inhibitory to both basipetal transport of IAA and the acropetal component of IAA-promoted metabolite transport. In contrast, both acropetal IAA transport and basipetal IAA-promoted metabolite transport were unaffected by TIBA treatment. The inhibitory effect of TIBA on acropetal IAA-promoted transport was overcome by providing IAA below the point of TIBA application. Both acropetal and basipetal IAA-promoted transport in stem segments were unaccompanied by any corresponding changes in the accumulation of [14C]sucrose by the segments.

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