Rodrigo MJ, García-Martínez JL
Instituto de Biología Molecular y Celular de Plantas, Universidad Politécnica de Valencia-Consejo Superior de Investigaciones Científicas, Camino de Vera s/n, 46022-Valencia, Spain
Plant Physiol. 1998 Feb 1;116(2):511-8. doi: 10.1104/pp.116.2.511.
The role of the apical shoot as a source of inhibitors preventing fruit growth in the absence of a stimulus (e.g. pollination or application of gibberellic acid) has been investigated in pea (Pisum sativum L.). Plant decapitation stimulated parthenocarpic growth, even in derooted plants, and this effect was counteracted by the application of indole acetic acid (IAA) or abscisic acid (ABA) in agar blocks to the severed stump. The treatment of unpollinated ovaries with gibberellic acid blocked the effect of IAA or ABA applied to the stump. [3H]IAA and [3H]ABA applied to the stump were transported basipetally, and [3H]ABA but not [3H]IAA was also detected in unpollinated ovaries. The concentration of ABA in unpollinated ovaries increased significantly in the absence of a promotive stimulus. The application of IAA to the stump enhanced by 2- to 5-fold the concentration of ABA in the inhibited ovary, whereas the inhibition of IAA transport from the apical shoot by triiodobenzoic acid decreased the ovary content of ABA (to approximately one-half). Triiodobenzoic acid alone, however, was unable to stimulate ovary growth. Thus, in addition to removing IAA transport from the apical shoot, the accumulation of a promotive factor is also necessary to induce parthenocarpic growth in decapitated plants.
在豌豆（Pisum sativum L.）中，研究了顶芽作为抑制剂来源在缺乏刺激（如授粉或施用赤霉素）时对果实生长的抑制作用。即使是去根的植株，去除顶芽也会刺激单性结实生长，而在琼脂块中向切断的茎残端施用吲哚乙酸（IAA）或脱落酸（ABA）可抵消这种作用。用赤霉素处理未授粉的子房可阻断施用于茎残端的IAA或ABA的作用。施用于茎残端的[3H]IAA和[3H]ABA向基部运输，在未授粉的子房中也检测到了[3H]ABA，但未检测到[3H]IAA。在没有促进性刺激的情况下，未授粉子房中ABA的浓度显著增加。向茎残端施用IAA可使受抑制子房中ABA的浓度提高2至5倍，而用三碘苯甲酸抑制IAA从顶芽的运输则会降低子房中的ABA含量（降至约一半）。然而，单独使用三碘苯甲酸无法刺激子房生长。因此，除了消除顶芽的IAA运输外，积累一种促进因子对于诱导去顶植株的单性结实生长也是必要的。
