Verlagerung von 14C-Saccharose aus den Kotyledonen von Helianthus-Keimlingen unter Einfluß von Abscisinsäure

Summary The influence of apical applications of abscisic acid (ABA) on the translocation of 14 C-sucrose from the cotyledons was investigated in sunflower seedlings. It could be demonstrated that 10 −4 M ABA induced a significant reduction of 14 C-content in apical plant sections near the ABA application site (repulsion). On the other hand, 10 −6 M ABA, especially with intact plants, caused the opposite effect (attraction). From the results it is concluded that ABA, depending on concentration, may influence the transport of sucrose within the plant by affecting sink capacity and/or the unloading of sieve tubes.