[Localisation of acropetal transport of 2-[(14)C]abscisic acid in roots of Phaseolus coccineus L. and evidence for a radial ABA-translocation between stele and cortex].

Acropetal polarity of ABA-transport in roots of runner beans is found to be located strictly in the stele. ABA movement in the cortex is very slow and unpolar. Experiments on partly decorticated and desteled roots gave evidence for a radial ABA-transport between the stele and cortex. Thus an ABA distribution quotient stele/cortex of 12/1 (expressed on tissue volume basis) is established after 9 h ABA incubation. The radial ABA-translocation is strongly inhibited at low temperature.