The Effect of Morphactin on the Kinetics of Indol-3yl-acetic Acid-2-14C Transport in Zea mays L. Coleoptile Segments

This paper elucidates the effects of chloroflurenol (morphactin,IT 3456) treatment on the kinetics of ¹⁴C-IAA transport throughZea mays L. (cv. Orla-266) coleoptile segments. Maximum inhibitionof transport was achieved when chloroflurenol remained in contactwith the tissue segments for at least 20 min or more. The treatment,without materially affecting the ¹⁴C-IAA-transport polarity,or uptake, significantly reduced the velocity from 20.5 mm h^–1to 8.79 mm h^–1 and also the intensity from 919 (ct/min)h^–1 to 413 (ct/min) h^–1.