Translocation of Tritium-labelled Gibberellic Acid in Pea Stem Segments and Potato Tuber Cylinders

Abstract

ALTHOUGH the transport of auxin has been studied in many plant species and tissues and has often been found to be strictly polar (see, for example, reviews by Jacobs¹ and Leopold²), comparable studies on the transport of gibberellins are scarce. Experiments by Watanabe and Scully³ and Clor et al.⁴ showed that gibberellic acid (GA) is readily translocated within the plant. Zweig et al.⁵ reported similar findings. Kato6 found no indication of a polar pattern of GA translocation in pea stems. In the present work, GA labelled with tritium was used to study further the nature of translocation of GA in pea stem sections, particularly with respect to polarity, and in the parenchymatous tissue of the potato tuber.