Abstract
The transport of radiolabeled indoleacetic acid (IAA), and some of its conjugates, was investigated in nodal stem segments of Phaseolus vulgaris L. Donor agar blocks containing either [2-acetyl-14C]-IAA; [2-acetyl-14C]-indole-3-acetyl-L-aspartate (IAAsp); [2-acetyl-14C]-indole-3-acetyl-L-glycine (IAGly); or [2-acetyl-14C]-indole-3-acetyl-L-alanine (IAAla) were placed on either the apical or basal cut surface of stem segments each bearing an axillary bud at the midline. In some experiments, a receiver block was placed on the end opposite to the donor. After transport was terminated, the segments were divided into five equal sections plus the bud, and the radioactivity of donors, receivers and each part of the stem segment was counted.
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