Feng Peiqiang, Guo Hailong, Chi Wei, Chai Xin, Sun Xuwu, Xu Xiumei, Ma Jinfang, Rochaix Jean-David, Leister Dario, Wang Haiyang, Lu Congming, Zhang Lixin
Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;
Proc Natl Acad Sci U S A. 2016 Sep 20;113(38):10708-13. doi: 10.1073/pnas.1521599113. Epub 2016 Sep 6.
Light is a major environmental factor regulating flowering time, thus ensuring reproductive success of higher plants. In contrast to our detailed understanding of light quality and photoperiod mechanisms involved, the molecular basis underlying high light-promoted flowering remains elusive. Here we show that, in Arabidopsis, a chloroplast-derived signal is critical for high light-regulated flowering mediated by the FLOWERING LOCUS C (FLC). We also demonstrate that PTM, a PHD transcription factor involved in chloroplast retrograde signaling, perceives such a signal and mediates transcriptional repression of FLC through recruitment of FVE, a component of the histone deacetylase complex. Thus, our data suggest that chloroplasts function as essential sensors of high light to regulate flowering and adaptive responses by triggering nuclear transcriptional changes at the chromatin level.
光是调节开花时间的主要环境因素，从而确保高等植物的繁殖成功。与我们对所涉及的光质和光周期机制的详细了解形成对比的是，高光促进开花的分子基础仍然难以捉摸。在这里，我们表明，在拟南芥中，一种叶绿体衍生的信号对于由开花位点C（FLC）介导的高光调节开花至关重要。我们还证明，PTM是一种参与叶绿体逆行信号传导的PHD转录因子，它感知这种信号并通过招募组蛋白去乙酰化酶复合体的一个组分FVE来介导FLC的转录抑制。因此，我们的数据表明，叶绿体作为高光的重要传感器，通过在染色质水平触发核转录变化来调节开花和适应性反应。
