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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Polarized endoplasmic reticulum aggregations in the establishing division plane of protodermal cells of the fern Asplenium nidus
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Polarized endoplasmic reticulum aggregations in the establishing division plane of protodermal cells of the fern Asplenium nidus

机译：蕨形天冬草的原皮细胞建立分裂平面中的极化内质网聚集

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摘要

The determination of the division plane in protodermal cells of the fern Asplenium nidus occurs during interphase with the formation of the phragmosome, the organization of which is controlled by the actomyosin system. Usually, the phragmosomes between adjacent cells were oriented on the same plane. In the phragmosomal cortical cytoplasm, an interphase microtubule (MT) ring was formed and large quantities of endoplasmic reticulum (ER) membranes were gathered, forming an interphase U-like ER bundle. During preprophase/prophase, the interphase MT ring and the U-like ER bundle were transformed into a MT and an ER preprophase band (PPB), respectively. Parts of the ER-PPB were maintained during mitosis. Furthermore, the plasmalemma as well as the nuclear envelope displayed local polarization on the phragmosome plane, while the cytoplasm between them was occupied by distinct ER aggregations. These consistent findings suggest that I. nidus protodermal cells constitute a unique system in which three elements of the endomembrane system (ER, plasmalemma, and nuclear envelope) show specific characteristics in the establishing division plane. Our experimental data support that the organization of the U-like ER bundle is controlled on a cellular level by the actomyosin system and intercellularly by factors emitted from the leaf apex. The possible role of the above endomembrane system elements on the mechanism that coordinates the determination of the division plane between adjacent cells in protodermal tissue of A. nidus is discussed.
机译：确定蕨类植物Asplenium nidus的原皮细胞中的分裂平面的过程是在与成膜细胞形成相的过程中进行的，成膜细胞的组织由放线菌素系统控制。通常，相邻细胞之间的膜小体在同一平面上定向。在睑板层皮质细胞质中，形成了相间微管（MT）环，并聚集了大量内质网（ER）膜，形成了相间U型ER束。在前期/前期期间，相间MT环和U形ER束分别转变为MT和ER前期带（PPB）。 ER-PPB的一部分在有丝分裂期间得以维持。此外，质膜以及核被膜在睑板平面上显示局部极化，而它们之间的细胞质被不同的ER聚集占据。这些一致的发现表明，构巢曲霉的原皮细胞构成了一个独特的系统，其中内膜系统的三个元素（ER，质膜和核膜）在建立的分裂平面中显示出特定的特征。我们的实验数据支持U型ER束的组织在细胞水平上受到放线菌素系统的控制，而在细胞间受到叶尖发出的因子的控制。讨论了上述内膜系统元件在协调确定构巢曲霉原皮组织中相邻细胞之间的分裂平面的机制中的可能作用。

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