Many plants synchronize their flowering times with changing seasons to maximize reproductive success. A key seasonal cue is the change in day length (photoperiod), that induces the production of a systemic flowering signaling molecule called florigen. A major florigen component is FLOWERING LOCUS T (FT) or its orthologs. In the long-day plant Arabidopsis thaliana, FT expression is well known to be activated by the photoperiod pathway output specifically near dusk in long days; however, underappreciated is the importance of FT silencing at other times of the day, in enabling Arabidopsis to respond only to long days in flowering. We have recently reported that a plant-specific chromatin-silencing complex called EMF1c represses FT expression at times other than around dusk in long days to prevent its temporal ectopic expression from “spoiling” the long-day floral induction in Arabidopsis . Here I further discuss in other day-length sensitive plants the potential involvement of a chromatin mechanism similar to the Arabidopsis EMF1c-mediated silencing, in repressing the expression of FT orthologs to enable diverse photoperiodic control of flowering.
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机译：许多植物将其开花时间与季节变化同步，以最大限度地提高繁殖成功率。一个关键的季节性提示是日长的变化（光周期），该变化诱导了称为弗罗里根的系统性开花信号分子的产生。主要的荧光素成分是FLOWERING LOCUS T（FT）或其直系同源物。众所周知，在长日照植物拟南芥中，FT表达被光周期途径的输出特别是在长日接近黄昏时激活。然而，在一天中的其他时间，FT沉默对于让拟南芥仅对开花期长的天做出反应的重要性没有得到足够的重视。最近，我们报道了一种名为EMF1c的植物特异性染色质沉默复合物，在长日中的黄昏时间以外的其他时间抑制FT表达，以防止其时间异位表达“喷洒”长时间的花诱导。拟南芥。在这里，我进一步讨论了在其他日长敏感植物中，与拟南芥EMF1c介导的沉默类似的染色质机制在抑制FT直系同源基因表达方面的潜在参与，以实现对开花的多种光周期控制。
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