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FKF1 is essential for photoperiodic-specific light signalling in Arabidopsis

机译：FKF1对于拟南芥中光周期特异性光信号传导至关重要

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摘要

Adaptation to seasonal change is a crucial component of an organism's survival strategy. To monitor seasonal variation, organisms have developed the capacity to measure day length (photoperiodism). Day-length assessment involves the photo-periodic control of flowering in Arabidopsis thaliana, whereby the coincidence of light and high expression of CONSTANS (CO) induces the expression of FLOWERING LOCUS T (FT), leading to flowering in long-day conditions. Although controlling CO expression is clearly a key step in day-length discrimination, the mechanism that generates day-length-dependent CO expression remains unknown. Here we show that the clock-controlled FLAVIN-BINDING, KELCH REPEAT, F-BOX (FKF1) protein has an essential role in generating the diurnal CO peak and that this function is dependent on light. We show that a recombinant FKF1 LIGHT, OXYGEN OR VOLTAGE (LOV) domain binds the chromophore flavin mononucleotide and undergoes light-induced photochemistry, indicating that FKF1 may function as a photoperiodic blue-light receptor. It is likely that the circadian control of FKF1 expression and the light regulation of FKF1 function coincide to control the daytime CO waveform precisely, which in turn is crucial for day-length discrimination by Arabidopsis.
机译：适应季节性变化是有机体生存策略的关键组成部分。为了监测季节变化，生物体已经开发出测量日长（光周期）的能力。日长评估涉及拟南芥开花的光周期控制，由此光和高表达的CONSTANS（CO）的重合诱导了FLOWERING LOCUS T（FT）的表达，从而导致长日开花。尽管控制CO表达显然是昼长鉴别中的关键步骤，但产生依赖于日长的CO表达的机制仍然未知。在这里，我们显示了时钟控制的FLAVIN-BINDING，KELCH REPEAT，F-BOX（FKF1）蛋白在产生昼夜CO峰方面具有重要作用，并且该功能依赖于光。我们显示重组FKF1的光，氧或电压（LOV）域结合发色团黄素单核苷酸，并经历光诱导的光化学，表明FKF1可能起着光周期蓝光受体的作用。 FKF1表达的昼夜节律控制和FKF1功能的光调节可能恰好一致，以精确地控制白天的CO波形，这对于拟南芥区分白天的长度至关重要。

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