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首页> 外文期刊>Plant and cell physiology >The EC Night-Time Repressor Plays a Crucial Role in Modulating Circadian Clock Transcriptional Circuitry by Conservatively Double-Checking Both Warm-Night and Night-Time-Light Signals in a Synergistic Manner in Arabidopsis thaliana
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The EC Night-Time Repressor Plays a Crucial Role in Modulating Circadian Clock Transcriptional Circuitry by Conservatively Double-Checking Both Warm-Night and Night-Time-Light Signals in a Synergistic Manner in Arabidopsis thaliana

机译：EC夜间阻遏物通过保守地双重检查拟南芥中协同作用的暖夜和夜间光信号，在调节昼夜节律转录电路中起着至关重要的作用。

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During the last decade, significant research progress has been made in Arabidopsis thaliana in defining the molecular mechanisms behind the plant circadian clock. The circadian clock must have the ability to integrate both external light and ambient temperature signals into its transcriptional circuitry to regulate its function properly. We previously showed that transcription of a set of clock genes including LUX (LUX ARRHYTHMO), GI (GIGANTEA), LNK1 (NIGHT LIGHT-INDUCIBLE AND CLOCK-REGULATED GENE 1), PRR9 (PSEUDO-RESPONSE REGULATOR 9) and PRR7 is commonly regulated through the evening complex (EC) night-time repressor in response to both moderate changes in temperature (Delta 6 degrees C) and differences in steady-state growth-compatible temperature (16-28 degrees C). Here, we further show that a night-time-light signal also feeds into the circadian clock transcriptional circuitry through the EC night-time repressor, so that the same set of EC target genes is up-regulated in response to a night-time-light pulse. This light-induced event is dependent on phytochromes, but not cryptochromes. Interestingly, both the warm-night and night-time-light signals negatively modulate the activity of the EC night-time repressor in a synergistic manner. In other words, an exponential burst of transcription of the EC target genes is observed only when these signals are simultaneously fed into the repressor. Taken together, we propose that the EC night-time repressor plays a crucial role in modulating the clock transcriptional circuitry to keep track properly of seasonal changes in photo-and thermal cycles by conservatively double-checking the external light and ambient temperature signals.
机译：在过去十年中，拟南芥在确定植物生物钟背后的分子机制方面取得了重大研究进展。昼夜节律时钟必须具有将外部光和环境温度信号集成到其转录电路中的能力，以正确调节其功能。我们以前曾证明，一组时钟基因的转录，包括LUX（LUX ARRHYTHMO），GI（GIGANTEA），LNK1（夜光诱导和时钟调节基因1），PRR9（伪响应调节子9）和PRR7通常是受调节的。通过夜间复杂（EC）夜间阻遏器，以响应温度的适度变化（Δ6摄氏度）和稳态生长适应温度的差异（16-28摄氏度）。在这里，我们进一步表明，夜间光信号也通过EC夜间阻遏物输入到生物钟的时钟转录电路中，因此同一组EC靶基因在夜间响应时被上调。光脉冲。这种光诱导事件取决于植物色素，而不取决于隐色色素。有趣的是，暖夜和夜间灯光信号均以协同方式对EC夜间阻遏物的活动产生负面影响。换句话说，仅当将这些信号同时输入阻遏物时，才观察到EC靶基因的转录呈指数爆发。综上所述，我们建议EC夜间阻遏器在调制时钟转录电路中发挥关键作用，以便通过保守地仔细检查外部光和环境温度信号来正确跟踪光热循环的季节性变化。

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