Max-Planck Institute for Molecular Plant Physiology, Am Muehlenberg 1, 14476, Potsdam, Germany.
Instituto Gulbenkian de Ciência, R. Q.ta Grande 6, 2780-156, Oeiras, Portugal.
Nat Commun. 2019 Feb 13;10(1):737. doi: 10.1038/s41467-019-08703-2.
Plants have adapted to the diurnal light-dark cycle by establishing elaborate transcriptional programs that coordinate many metabolic, physiological, and developmental responses to the external environment. These transcriptional programs have been studied in only a few species, and their function and conservation across algae and plants is currently unknown. We performed a comparative transcriptome analysis of the diurnal cycle of nine members of Archaeplastida, and we observed that, despite large phylogenetic distances and dramatic differences in morphology and lifestyle, diurnal transcriptional programs of these organisms are similar. Expression of genes related to cell division and the majority of biological pathways depends on the time of day in unicellular algae but we did not observe such patterns at the tissue level in multicellular land plants. Hence, our study provides evidence for the universality of diurnal gene expression and elucidates its evolutionary history among different photosynthetic eukaryotes.
植物通过建立精细的转录程序来适应昼夜光暗循环，协调许多代谢、生理和发育反应以适应外部环境。这些转录程序仅在少数几种物种中进行了研究，其在藻类和植物中的功能和保守性目前尚不清楚。我们对 9 种古生菌的昼夜循环进行了比较转录组分析，结果表明，尽管在形态和生活方式上存在很大的系统发育距离和显著差异，但这些生物的昼夜转录程序是相似的。与细胞分裂和大多数生物途径相关的基因的表达依赖于单细胞藻类的时间，但我们在多细胞陆地植物的组织水平上没有观察到这种模式。因此，我们的研究为昼夜基因表达的普遍性提供了证据，并阐明了其在不同光合真核生物中的进化历史。
