Botanisches Institut der Universität Würzburg, Mittlerer Dallenbergweg 64, D-8700, Würzburg, Federal Republic of Germany.
Planta. 1977 Jan;134(3):295-9. doi: 10.1007/BF00384196.
Abscisic acid (ABA) in lanolin, applied to the internode of decapitated runner bean plants enhances the outgrowth of lateral buds. The optimum concentration of the paste is 10(-5) M. The effect of ABA is counteracted by indoleacetic acid (IAA) but not by gibberellic acid (GA3). There is no effect when ABA is applied to the apical bud or lateral buds of intact plants. However, 13.2 ng given to the lateral buds of decapitated plants stimulate their growth, whereas higher concentrations are inhibitory. Consequently, ABA enhances growth of lateral buds directly, but only when apical dominance is already weakened. The growth of the decapitated 2(nd) internode was not affected by ABA. Radioactivity from [2-(14)C] ABA, applied to nonelongating 2(nd) internode stumps of decapitated runner bean plants moves to the lateral buds, whereas [1-(14)C]IAA-and [(3)H]GA1-translocation is much weaker. ABA transport is inhibited if IAA or [(3)H]GA1 is applied simultaneously. In elongating internodes [(14)C]ABA is almost completely immobile. [(14)C]IAA-and [(3)H]GA1-translocation is not affected by ABA. The amount of radioactivity from labelled ABA, translocated to the lateral buds, is highest during the early stages of bud outgrowth.
脱落酸（ABA）在羊毛脂中的应用，涂抹在断头菜豆植物的节间，可以促进侧芽的生长。糊状物的最佳浓度为 10（-5）M。ABA 的作用被吲哚乙酸（IAA）抵消，但不受赤霉素（GA3）的影响。当 ABA 应用于完整植物的顶芽或侧芽时，没有效果。然而，给予断头植物侧芽的 13.2ng 可以刺激它们的生长，而较高浓度则具有抑制作用。因此，ABA 直接增强侧芽的生长，但只有在顶端优势已经减弱时才会如此。ABA 对断头的第 2 节间的生长没有影响。应用于断头菜豆植物非伸长的第 2 节间残桩的[2-（14）C]ABA 的放射性，移动到侧芽，而[1-（14）C]IAA-和[(3)H]GA1-转运则弱得多。如果同时应用 IAA 或[(3)H]GA1，则 ABA 运输会受到抑制。在伸长的节间中，[14C]ABA 几乎完全不移动。[(14)C]IAA-和[(3)H]GA1-转运不受 ABA 的影响。标记的 ABA 向侧芽转运的放射性物质的数量在芽生长的早期阶段最高。
