T. Rausch, D. N. Butcher, G. Hudd
1988
Citations
0
Influential Citations
5
Citations
Journal
Plant Science
Abstract
Abstract 1-Naphthaleneacetic acid (1-NAA) promoted the active uptake of 3-O- methyl- d -glucose (OMG) by 30% in 2-mm coleoptile sections from 5-day-old Zea mays L. seedlings. The half-maximum effect was at 0.52 μM. The auxin antagonist 2-naphthalene-acetic acid (2-NAA) also stimulated the uptake of OMG, but with a half-maximum effect at 5 μM. In time course experiments it was shown that the stimulation of OMG uptake by 1-NAA was preceded by a transient inhibition. The stimulatory effect of 1-NAA was dependent on the presence of KCl. 2,3,5-Triiodobenzoic acid (TIBA) (10 μM) had no effect on its own but completely reversed the stimulation by 1-NAA. In contrast, with coleoptile sections from 6-day-old seedlings, where 1-NAA had no effect, TIBA inhibited OMG uptake by 25%, with a half-maximum effect at 1 μM.