Abstract
Carbon-14-labelled ethylenediurea (EDU), synthesised from diethylenetriamine and 14C-urea, was stem-injected into 2-year-old seedlings of sugar maple, white ash, flowering dogwood and flowering crabapple. At time intervals ranging from 1 h to 42 days after treatment, macroautoradiographs of leaf, stem and root tissue were made to determine relative distribution patterns of labelled chemical. Translocation of 14C-EDU was very rapid and predominantly acropetal, especially after the first few hours. Maximum quantities of 14C were found in leaf tissue approximately 7–10 days following injection, after which the intensity of the labelled chemical declined over the remainder of the study (42 days). Distribution patterns of 14C-EDU were correlated with observed levels of protection afforded most plants when the chemical is injected 7 days before fumigation with ozone.
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