Phytohormones and their interactions are critical for fruit development and, are key topics in horticulture research. Auxin, together with gibberellic acid (GA), promotes cell division and expansion, thus subsequently regulates fruit development and enlargement after fertilization. Auxin and GA related mutants show parthenocarpy (fruit formation without fertilization of ovule) in many plant species, indicating that these hormones and possibly their interactions play a key role in the regulation of fruit initiation and development. Recent studies have shown clear molecular and genetic evidence that ARF/IAA and DELLA protein interact each other and regulate both auxin and GA signaling pathways in response to auxin and GA during fruit growth in horticultural plants, tomato (the most studied freshy fruit) and strawberry (the model of Rosaceae). These recent findings provide new insights into the mechanisms by which plant hormones auxin and GA regulate fruit development.

中文翻译：

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生长素和 GA 信号之间的相互作用协调早期果实发育。

植物激素及其相互作用对果实发育至关重要，也是园艺研究的关键课题。生长素与赤霉酸（GA）一起促进细胞分裂和扩张，从而随后调节受精后果实的发育和增大。生长素和 GA 相关突变体在许多植物物种中表现出单性结实（没有胚珠受精的果实形成），这表明这些激素及其相互作用可能在果实起始和发育的调节中起关键作用。最近的研究表明，在园艺植物、番茄（研究最多的新鲜水果）和草莓的果实生长过程中，ARF/IAA 和 DELLA 蛋白相互作用并调节生长素和 GA 信号通路以响应生长素和 GA 的明确分子和遗传证据（蔷薇科的模型）。