title: Autoradiographic studies of ethylenediurea distribution in woody plants.
abstract: Carbon-14-labelled ethylenediurea (EDU), synthesised from diethylenetriamine and (14)C-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 (14)C-EDU was very rapid and predominantly acropetal, especially after the first few hours. Maximum quantities of (14)C 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 (14)C-EDU were correlated with observed levels of protection afforded most plants when the chemical is injected 7 days before fumigation with ozone.
authors.affiliation: United States Department of Agriculture, Agricultural Research Service, Ohio Wesleyan University, Delaware, OH 43015, USA.
authors.forename: B R
authors.initials: BR
authors.lastname: Roberts
authors.forename: L R
authors.initials: LR
authors.lastname: Wilson
authors.forename: J J
authors.initials: JJ
authors.lastname: Cascino
authors.forename: G P
authors.initials: GP
authors.lastname: Smith