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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Two Arabidopsis circadian oscillators can be distinguished by differential temperature sensitivity.
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Two Arabidopsis circadian oscillators can be distinguished by differential temperature sensitivity.

机译：两个拟南芥生物钟振荡器可以通过不同的温度灵敏度来区分。

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摘要

Circadian rhythms are widespread in nature and reflect the activity of an endogenous biological clock. In metazoans, the circadian system includes a central circadian clock in the brain as well as distinct clocks in peripheral tissues such as the retina or liver. Similarly, plants have distinct clocks in different cell layers and tissues. Here, we show that two different circadian clocks, distinguishable by their sensitivity to environmental temperature signals, regulate the transcription of genes that are expressed in the Arabidopsis thaliana cotyledon. One oscillator, which regulates CAB2 expression, responds preferentially to light-dark versus temperature cycles and fails to respond to the temperature step associated with release from stratification. The second oscillator, which regulates CAT3 expression, responds preferentially to temperature versus light-dark cycles and entrains to the release from stratification. Finally, the phase response curves of these two oscillators to cold pulses are distinct. The phase response curve of the oscillator component TOC1 to cold pulses is similar to that of CAB2, indicating that CAB2 is regulated by a TOC1-containing clock. The existence of two clocks, distinguishable on the basis of their sensitivity to temperature, provides an additional means by which plants may integrate both photoperiodic and temperature signals to respond to the changing seasons.
机译：昼夜节律在自然界很普遍，反映了内源性生物钟的活动。在后生动物中，昼夜节律系统包括大脑中的中央昼夜节律以及周围组织（如视网膜或肝脏）中的独特节律。同样，植物在不同的细胞层和组织中具有不同的时钟。在这里，我们显示了两个不同的生物钟，通过对环境温度信号的敏感性可以区分，调节拟南芥子叶中表达的基因的转录。调节CAB2表达的一个振荡器优先响应明暗与温度循环，而无法响应与分层释放相关的温度阶跃。调节CAT3表达的第二个振荡器优先响应温度与明暗循环的关系，并夹带分层释放。最后，这两个振荡器对冷脉冲的相位响应曲线是不同的。振荡器组件TOC1对冷脉冲的相位响应曲线类似于CAB2的曲线，表明CAB2由包含TOC1的时钟调节。根据对温度的敏感性可以区分的两个时钟的存在为植物提供了一种额外的方式，使植物可以整合光周期和温度信号来响应季节的变化。

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