近期，来自韩国首尔大学化学系的Chung-Mo Park教授在Molecular plant发表了题为GIGANTEA Shapes the Photoperiodic Rhythms of Thermomorphogenic Growth in Arabidopsis的研究论文，文章揭示了分子伴侣GI通过热稳定GA信号介质RGA，从而形成热形态生长的光周期节律。

另外，杂志同期也发表了题为GIGANTEA Integrates Photoperiodic and Temperature Signals to Time when Growth Occurs 的Spotlight 文章。

在温度波动的环境中，植物通过调整其形态和结构来维持其内部温度，这一适应性过程被称为热形态发生 (thermomorphogenesis)。值得注意的是，植物热形态发生的节律模式受日长信息的控制。然而，光周期是如何调节热形态发生节律的仍然是个谜。

本文中，作者证明了温暖的温度促进了伴侣GIGANTEA (GI)的积累，GI在长日照下保持了Della蛋白RGA，即ga1-3的阻遏因子(REPRESSOR OF ga1-3) 热稳定，从而减弱了PIF4 (PHYTOCHROME INTERACTING FACTOR 4)介导的热形态发生。相反，在短日照下，当GI积累减少时，RGA很容易通过赤霉素介导的泛素化-蛋白酶体途径降解，从而促进热形态生长。这些数据表明，GI-RGA-PIF4信号模块能够使植物的热形态发生反应以一种依赖于日长的方式发生。

最后，作者认为，GI介导的光周期和温度信息的整合塑造形成了热形态发生节律，使植物能够适应季节转换期间日长和温度的昼夜波动。

GI介导的光周期调控热形态生长的工作模型

文章链接：https://doi.org/10.1016/j.molp.2020.01.003

Spotlight 文章链接：https://doi.org/10.1016/j.molp.2020.02.008

附：Abstract

Plants maintain their internal temperature under environments with fluctuating temperatures by adjusting their morphology and architecture, an adaptive process termed thermomorphogenesis. Notably, the rhythmic patterns of plant thermomorphogenesis are governed by day-length information. However, it remains elusive how thermomorphogenic rhythms are regulated by photoperiod. Here, we show that warm temperatures enhance the accumulation of the chaperone GIGANTEA (GI), which thermostabilizes the DELLA protein, REPRESSOR OF ga1-3 (RGA), under long days, thereby attenuating PHYTOCHROME INTERACTING FACTOR 4 (PIF4)-mediated thermomorphogenesis. In contrast, under short days, when GI accumulation is reduced, RGA is readily degraded through the gibberellic acid-mediated ubiquitination-proteasome pathway, promoting thermomorphogenic growth. These data indicate that the GI–RGA–PIF4 signaling module enables plant thermomorphogenic responses to occur in a day-length-dependent manner. We propose that the GI-mediated integration of photoperiodic and temperature information shapes thermomorphogenic rhythms, which enable plants to adapt to diel fluctuations in day length and temperature during seasonal transitions.