美国康奈尔大学Jocelyn K.C. Rose、Zhangjun Fei、斯基德莫尔学院David S. Domozych等研究人员合作揭示了陆生植物起源的标志。2020年5月21日，《细胞》杂志在线发表了这项成果。

研究人员报道了单细胞藻类Penium margaritaceum（Zygnematophyceae的成员，陆地植物的姐妹谱系）的基因组序列。该基因组具有高比例的重复序列，这些序列与大量节段基因重复相关，可能促进了新功能化。与较早出现的典型不同藻类谱系相比，Penium margaritaceum扩大了基因家族、信号网络和适应性反应的范围，从而突出了向陆地化的进化轨迹。这些涵盖了广泛的生理过程和保护性细胞特征，例如类黄酮化合物以及参与细胞壁生物合成、组装和重塑的大量修饰酶家族。转录组分析进一步阐明了与Penium margaritaceum半陆生生态系统相关的适应性、反应和选择性压力。

附：英文原文

Title: The Penium margaritaceum Genome: Hallmarks of the Origins of Land Plants

Author: Chen Jiao, Iben Srensen, Xuepeng Sun, Honghe Sun, Hila Behar, Saleh Alseekh, Glenn Philippe, Kattia Palacio Lopez, Li Sun, Reagan Reed, Susan Jeon, Reiko Kiyonami, Sheng Zhang, Alisdair R. Fernie, Harry Brumer, David S. Domozych, Zhangjun Fei, Jocelyn K.C. Rose

Issue&Volume: 2020-05-21

Abstract: The evolutionary features and molecular innovations that enabled plants to first colonizeland are not well understood. Here, insights are provided through our report of thegenome sequence of the unicellular alga Penium margaritaceum, a member of the Zygnematophyceae, the sister lineage to land plants. The genomehas a high proportion of repeat sequences that are associated with massive segmentalgene duplications, likely facilitating neofunctionalization. Compared with representativesof earlier diverging algal lineages, P. margaritaceum has expanded repertoires of gene families, signaling networks, and adaptive responsesthat highlight the evolutionary trajectory toward terrestrialization. These encompassa broad range of physiological processes and protective cellular features, such asflavonoid compounds and large families of modifying enzymes involved in cell wallbiosynthesis, assembly, and remodeling. Transcriptome profiling further elucidatedadaptations, responses, and selective pressures associated with the semi-terrestrialecosystems of P. margaritaceum, where a simple body plan would be an advantage.

DOI: 10.1016/j.cell.2020.04.019

Source: https://www.cell.com/cell/fulltext/S0092-8674(20)30482-7