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Differential effects of light-to-dark transitions on phase setting in circadian expression among clock-controlled genes in Pharbitis nil

机译:光到暗过渡对昼夜节日治疗的昼夜节律表达相位设置的差异效应

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摘要

The circadian clock is synchronized by the day-night cycle to allow plants to anticipate daily environmental changes and to recognize annual changes in day length enabling seasonal flowering. This clock system has been extensively studied in Arabidopsis thaliana and was found to be reset by the dark to light transition at dawn. By contrast, studies on photoperiodic flowering of Pharbitis nil revealed the presence of a clock system reset by the transition from light to dark at dusk to measure the duration of the night. However, a Pharbitis photosynthetic gene was also shown to be insensitive to this dusk transition and to be set by dawn. Thus Pharbitis appeared to have two clock systems, one set by dusk that controls photoperiodic flowering and a second controlling photosynthetic gene expression similar to that of Arabidopsis. Here, we show that circadian mRNA expression of Pharbitis homologs of a series of Arabidopsis clock or clock-controlled genes are insensitive to the dusk transition. These data further define the presence in Pharbitis of a clock system that is analogous to the Arabidopsis system, which co-exists and functions with the dusk-set system dedicated to the control of photoperiodic flowering.
机译:昼夜昼夜循环同步昼夜同步,以允许工厂预测日常环境变化,并识别日间长度的年度变化,从而实现季节性开花。该时钟系统在拟南芥中已经广泛研究了拟南芥,并被发现在黎明时被黑暗重置为光线过渡。相比之下,对斑骨炎的光周期开花的研究显示,在黄昏时,通过从光到暗到黑暗的过渡的时钟系统的存在,以测量夜间的持续时间。然而,对这种黄昏过渡也显示出对瘢痕性光合基因的不敏感,并由黎明设定。因此,Pharbitis似乎具有两个时钟系统,由Dusk设置,可控制光周期开花和与拟南芥类似的第二控制光合作因的基因表达。在这里,我们表明,一系列拟南芥或时钟控制基因的鸬鹚同源物的昼夜野性mRNA表达对黄昏过渡不敏感。这些数据进一步定义了类似于拟南芥系统的时钟系统的斑骨炎的存在,该系统共存和功能,该系统与专用于对光周期开花的控制的Dusk-Set系统。

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