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首页> 外文期刊>Journal of Experimental Botany >Exine dehiscing induces rape microspore polarity, which results in different daughter cell fate and fixes the apicalbasal axis of the embryo
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Exine dehiscing induces rape microspore polarity, which results in different daughter cell fate and fixes the apicalbasal axis of the embryo

机译：外来脱脂诱导油菜小孢子极性，这导致不同的子代细胞命运并固定胚的顶基轴

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The roles of cell polarity and the first asymmetric cell division during early embryogenesis in apical-basal cell fate determination remain unclear. Previously, a novel Brassica napus microspore embryogenesis system was established, by which rape exine-dehisced microspores were induced by physical stress. Unlike traditional microspore culture, cell polarity and subsequent asymmetric division appeared in the exine-dehisced microspore, which finally developed into a typical embryo with a suspensor. Further studies indicated that polarity is critical for apical-basal cell fate determination and suspensor formation. However, the pattern of the first division was not only determined by cell polarity but was also regulated by the position of the ruptured exine. The first division could be equal or unequal, with its orientation essentially perpendicular to the polar axis. In both types of cell division, the two daughter cells could have different cell fates and give rise to an embryo with a suspensor, similar to zygotic apical-basal cell differentiation. The alignment of the two daughter cells is consistent with the orientation of the apical-basal axis of future embryonic development. Thus, the results revealed that exine dehiscing induces rape microspore polarization, and this polarity results in a different cell fate and fixes the apical-basal axis of embryogenesis, but is uncoupled from cell asymmetric division. The present study demonstrated the relationships among cell polarity, asymmetric cell division, and cell fate determination in early embryogenesis.Digital Object Identifier http://dx.doi.org/10.1093/jxb/ers327
机译：细胞极性和第一次不对称细胞分裂在根尖细胞命运决定早期胚胎发生中的作用尚不清楚。以前，建立了一个新的甘蓝型油菜小孢子胚胎发生系统，该系统通过物理胁迫诱导油菜外源分离的小孢子。不像传统的小孢子培养，细胞极性和随后的不对称分裂出现在外切开的小孢子中，小孢子最终发展成为带有悬臂的典型胚胎。进一步的研究表明，极性对于确定根尖细胞命运和形成悬臂至关重要。然而，第一分裂的模式不仅由细胞极性决定，而且还由破裂的外壁的位置决定。第一划分可以相等或不相等，其取向基本上垂直于极轴。在两种类型的细胞分裂中，两个子细胞可能具有不同的细胞命运，并产生带有悬臂的胚胎，类似于合子的顶基-基底细胞分化。两个子细胞的排列与未来胚胎发育的顶基轴方向一致。因此，结果揭示外生脱脂诱导油菜小孢子极化，并且这种极性导致不同的细胞命运并固定胚发生的顶基轴，但与细胞不对称分裂无关。本研究证明了早期胚胎发生过程中细胞极性，不对称细胞分裂和细胞命运确定之间的关系。数字对象标识符http://dx.doi.org/10.1093/jxb/ers327

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