Centre for Research in Agricultural Genomics (CRAG) CSIC-IRTA-UAB-UB, 08193 Barcelona, Spain.
Universitat Jaume I, 12071 Castelló de la Plana, Spain.
Plant Cell. 2019 Feb;31(2):384-398. doi: 10.1105/tpc.18.00617. Epub 2019 Jan 31.
Plants use light as energy for photosynthesis but also as a signal of competing vegetation. Using different concentrations of norflurazon and lincomycin, we found that the response to canopy shade in Arabidopsis () was repressed even when inhibitors only caused a modest reduction in the level of photosynthetic pigments. High inhibitor concentrations resulted in albino seedlings that were unable to elongate when exposed to shade, in part due to attenuated light perception and signaling via phytochrome B and phytochrome-interacting factors. The response to shade was further repressed by a retrograde network with two separate nodes represented by the transcription factor LONG HYPOCOTYL 5 and the carotenoid-derived hormone abscisic acid. The unveiled connection among chloroplast status, light (shade) signaling, and developmental responses should contribute to achieve optimal photosynthetic performance under light-changing conditions.
植物将光作为能量用于光合作用，但也将其作为竞争植被的信号。我们使用不同浓度的氟乐灵和林可霉素进行实验，发现拟南芥（）对冠层遮荫的反应受到抑制，即使抑制剂仅导致光合色素水平适度降低。高浓度抑制剂会导致白化幼苗在遮荫下无法伸长，部分原因是由于光感受和通过phytochrome B 和 phytochrome-interacting factors 的信号转导减弱。逆向网络进一步抑制了对遮荫的反应，该网络由两个独立的节点组成，分别由转录因子 LONG HYPOCOTYL 5 和类胡萝卜素衍生的激素脱落酸代表。揭示出的叶绿体状态、光（遮荫）信号和发育反应之间的联系，应该有助于实现在光照变化条件下获得最佳的光合作用性能。
