[en] Significant differences in the translocation behaviour of free and conjugated gibberellins have been observed in detached barley leaves. Following uptake through the cut area ³H- and ¹⁴C-labelled GA₃-glucosyl ester, GA₃-O(3)-glucoside, and GA₃-oyl-glycine to a high degree accumulated in the upper part of the leaves. On the contrary, free gibberellins like GA₁, GA₃, GA₄, and GA₃-7-aldehyde as well as indoleacetic acid. O(3)-methyl-D-glucose, and α-aminoisobutyric acid remained in the basal part of the leaves. Both types of compounds were nearly equally distributed along the leaf axis when taken up through the roots of intact barley seedlings. (author)

[en] The epimeric gibberellin-A₃-7-aldehydes 1 and 2 were silylated, enolised with KH and labelled with ³H₂O to give after desilylation the tritium-labelled epimeric gibberellin-A₃-7-aldehydes 4 and 5. Subsequent acetylation, oxidation and deacetylation afforded [6-³H] gibberellin-A₃ (6) and [6-³H]6-epi-gibberellin-A₃ (7). Thus, this route provides a convenient method for the preparation of [6-³H]GA₃ of high specific radioactivity. (author)