To ensure successful plant reproduction and crop production, the spatial and temporal control of the termination of the floral meristem must be coordinated. In Arabidopsis, the timing of this termination is determined by AGAMOUS (AG). Following its termination, the floral meristem underdoes gynoecium formation. A direct target of AG, CRABS CLAW (CRC), is involved in both floral meristem determinacy and gynoecium development. However, how floral meristem termination is coordinated with gynoecium formation is not understood. Here, we identify a mechanistic link between floral meristem termination and gynoecium development through fine-tuning of auxin homeostasis by CRC. CRC controls auxin homeostasis in the medial region of the developing gynoecium to generate proper auxin maxima. This regulation partially occurs via direct transcriptional repression of TORNADO2 (TRN2) by CRC. Plasma membrane-localized TRN2 modulates auxin homeostasis. We propose a model describing how regulation of auxin homeostasis mediates the transition from floral meristem termination to gynoecium development.

中文翻译：

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生长素稳态的微调控制着从花干细胞维持到妇科形成的过渡。

为了确保成功的植物繁殖和作物生产，必须协调花分生组织终止的空间和时间控制。在拟南芥中，终止时间由AGAMOUS（AG）确定。终止后，花分生组织进行雌蕊的形成。AG的直接目标是CRABS CLAW（CRC），它参与花分生组织的确定性和妇科的发育。然而，尚不清楚花分生组织的终止如何与雌蕊的形成协调。在这里，我们通过CRC对植物生长素稳态的微调，确定了花分生组织终止与雌生殖发育之间的机械联系。CRC控制发育中的妇科内侧区域的植物生长素稳态，以产生适当的植物生长素最大值。这种调节部分是通过CRC对TORNADO2（TRN2）的直接转录抑制而发生的。质膜定位的TRN2调节植物生长素稳态。我们提出一个模型，描述生长素稳态的调节如何介导从花分生组织终止到妇科发育的过渡。