New cues for body axis formation in plant embryos

First author: Minako Ueda; Affiliations: Nagoya University (名古屋大学): Furo-chon, Japan

Corresponding author: Minako Ueda

Plant embryogenesis initiates with the fusion of sperm and egg cell, and completes the generation of the basic outline of the future plant. Here, we summarize the recent findings about the signaling cascade triggering the zygotic (合子的) transcription, and the intracellular events and regulatory factors involved in the formation of the two major body axes. We highlight the lack of systematic de novo transcriptional activation in the zygote, and emphasize the importance of cytoskeletal reorganization to polarize the zygote and control the first asymmetric division that establishes the apical–basal axis. Finally, the limited knowledge of mechanisms that control the cell divisions separating the inner and outer cell layers is summarized and we propose approaches to enhance our understanding of basic principles of plant embryogenesis.

植物的胚胎发生起始于精子和卵细胞的融合，终止于未来植物基本轮廓的建成。本文，作者总结了近来有关信号级联诱导的合子转录、细胞内事件以及参与两个主要体轴形成的调控因子的研究进展。作者在本文中重点阐述了合子中缺少系统性从头转录激活，指出了细胞骨架重组对于合子极化及第一次不对称分裂建立顶基轴的重要性。最终，作者总结了目前对于控制内外层细胞分开的细胞分裂机理研究。作者还展望了未来研究植物胚胎发生机理的方法。

doi: https://doi.org/10.1016/j.pbi.2018.08.005

Journal: Current Opinion in Plant Biology

Published online: 14 September, 2018