Pre-germination seed-phytochrome signals control stem extension in dark-grown Arabidopsis seedlings
Pre-germination seed-phytochrome signals control stem extension in dark-grown Arabidopsis seedlings
复制标题
DOI：
10.1039/b315511k
复制
发表时间：
2004-01-01
影响因子：
3.1
通讯作者：
Casal, JJ
中科院分区：
文献类型：
--
作者：
Magliano, TA;Casal, JJ
黑暗生长的拟南芥的发育模式显着转移暴露的幼苗光：下胚轴（茎）生长的抑制是典型的反应之一。在这里，我们表明，下胚轴生长的黑暗生长的幼苗减少暴露的种子光。光信号在种子萌发前几小时内被光敏色素A和B感知。这种效应具有明显的选择性，因为光敏色素控制下的其他过程并不同样受到萌发前光线索的影响。下胚轴响应在光信号终止后持续两天，这比幼苗本身接受光刺激时观察到的持续性更强。用远红光处理，将光敏色素转化为非活性形式，并没有减少下胚轴对萌发前光的生长反应，这表明持续的信号不是活性光敏色素本身。我们认为跨发育阶段信号可以帮助植物适应环境。
The developmental pattern of dark-grown Arabidopsis thaliana is dramatically shifted by exposure of the seedlings to light: inhibition of hypocotyl (stem) growth is one of the typical responses. Here, we show that the hypocotyl growth of dark-grown seedlings is reduced by exposure of the seeds to light. The light signal is perceived by phytochromes A and B during the hours immediately prior to seed germination. The effect is obviously selective, as other processes under phytochrome control were not equally affected by the pre-germination light cue. The hypocotyl response persists for two days after termination of the light signal, which is more than the persistence observed when the seedlings themselves receive the light stimulus. Treatment with far-red light, which converts phytochrome to the inactive form, did not reduce the hypocotyl growth response to pre-germination light, indicating that the persistent signal was not active phytochrome itself. We propose that trans-developmental phase signals could help plants to adjust to their environment.