Microautoradiographic investigations on bidirectional translocation in the phloem of Vicia faba.
Using radioactive phenylalanine as a tracer, bidirectional translocation in the phloem of a single stem bundle of Vicia faba L. was detected by analyses of microautoradiographs. Bidirectional translocation occurred in lateral leaf traces subtending a leaf of a certain developmental stage. Before and after this stage, translocation was unidirectional, either acropetal or basipetal, respectively.
Forstbotanisches Institut der Universität Göttingen, Büsgenweg 2, D-3400, Göttingen-Weende, Federal Republic of Germany.
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