本文于2017年11月24日在线发表于Molecular plant, 原题目为：

Lost memories of winter - Breaking the FLC silence

图1. 在胚胎发生过程中，LEC1重启FLC的表达。（A）整个植物生命周期中FLC（黑色）和LEC1（红色）的表达模式。图表下面的图片说明了植物发育的主要阶段（萌发/幼苗建立，营养生长阶段，生殖生长阶段，种子和胚胎发育）。LEC1可以激活FLC。LEC1在胚胎发育早期强烈表达。FLC的表达在幼苗发育和营养生长过程中受到冷的抑制，在早期胚胎发生中被重新激活。甚至在LEC1停止转录后，FLC仍然保持高水平的表达。FLC的重新激活在缺乏LEC1（lec1 FRI）或LEC1和类LEC1（lec1 l1l FRI）的植物中受损，并且在缺乏LEC1，L1L和另外三个LEC1同源物（lec1 l1l FRI中RNAi NF-YB）的植物中完全丧失。（B）FLC以及参与FLC再活化的基因的表达模式热图（来自AtGenExpress汇编的数据）。在整个生命周期中，EFS，SWC6，ELF6和NF-YB的表达相对均匀。相反，LEC1和L1L优先在种子发育早期表达。

Figure 1. LEC1 resets FLC expression during embryogenesis. (A) Scheme of FLC (black) and LEC1 (red) expression throughout the plant′s life cycle. Drawings below the chart illustrate major phases of plant development (germination/seedlings establishment, vegetative growth phase, reproductive phase, seed and embryo development). LEC1 can activate FLC. LEC1 is strongly expressed during early embryogenesis. FLC transcription, which is repressed by cold during seedling development and vegetative growth, is reactivated in early embryogenesis. FLC expression is maintained even after LEC1 transcription has ceased. FLC reactivation is impaired in plants lacking LEC1 (lec1 FRI) or both LEC1 and LEC1-like (lec1 l1l FRI) and completely lost in plants deficient in LEC1, L1L and three additional LEC1 homologs (RNAi NF-YBs in lec1 l1l FRI). (B) Heatmap of developmental expression patterns of FLC and genes involved in FLC reactivation (data from the AtGenExpress compendium). Expression of EFS, SWC6, ELF6 and the NF-YBs is relatively uniform throughout the life cycle. In contrast, LEC1 and L1L are preferentially expressed during early seed development.

每日一词

preferentially

英 [,prefə'renʃəli] 美

adv. 优先地；优惠地

preferentially

adv. preferential的变形

preferential [,prefə'renʃəl]

adj.优先的；优待的

供选择的

(关税等)优惠的，特惠的

表明选择顺序的