ABSTRACT The signaling network formed by external environmental signals and endogenous hormone signals is an important basis for the adaptive growth of plants. We recently identified a UDP-glucosyltransferase gene, UGT76F1, which controls the glucosylation of auxin precursor IPyA and mediates light-temperature signaling to regulate auxin-dependent hypocotyl elongation in Arabidopsis. However, it is unclear whether UGT76F1 is involved in the adaptive growth of other tissues and whether it is related to the signaling of other hormones besides auxin. Here we investigated the petiole elongation of UGT76F1 overexpression lines and knockout mutant lines, and also studied the effects of UGT76F1 on BR signaling. Experimental results indicated that UGT76F1 is involved in the PIF4-mediated petiole growth under high temperature and that UGT76F1 is also related to the BR signaling in controlling hypocotyl growth. These results suggest that UGT76F1 may have a wider significance in the plant adaptations to surrounding environments.

中文翻译：

---

糖基转移酶UGT76F1参与拟南芥中温度介导的叶柄伸长和BR介导的下胚轴生长

摘要 外部环境信号和内源激素信号形成的信号网络是植物适应性生长的重要基础。我们最近发现了一个 UDP-葡萄糖基转移酶基因 UGT76F1，它控制着生长素前体 IPyA 的葡萄糖基化并介导光温信号以调节拟南芥中依赖于生长素的下胚轴伸长。然而，尚不清楚UGT76F1是否参与了其他组织的适应性生长，是否与生长素以外的其他激素的信号传导有关。在这里，我们研究了 UGT76F1 过表达系和敲除突变系的叶柄伸长，还研究了 UGT76F1 对 BR 信号传导的影响。实验结果表明，UGT76F1 参与高温下 PIF4 介导的叶柄生长，UGT76F1 还与控制下胚轴生长的 BR 信号有关。这些结果表明 UGT76F1 在植物对周围环境的适应中可能具有更广泛的意义。